European Association of Echocardiography recommendations for the assessment of valvular regurgitation. Part 2: mitral and tricuspid regurgitation (native valve disease).

Abstract

Mitral and tricuspid are increasingly prevalent. Doppler echocardiography not only detects the presence of regurgitation but also permits to understand mechanisms of regurgitation, quantification of its severity and repercussions. The present document aims to provide standards for the assessment of mitral and tricuspid regurgitation.

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RECOMMENDATIONS
European Association of Echocardiography
recommendations for the assessment of valvular
regurgitation. Part 2: mitral and tricuspid
regurgitation (native valve disease)
Patrizio Lancellotti (Chair)1*, Luis Moura2, Luc A. Pierard1, Eustachio Agricola3,
Bogdan A. Popescu4, Christophe Tribouilloy5, Andreas Hagendorff6, Jean-Luc Monin7,
Luigi Badano8, and Jose L. Zamorano9on behalf of the European Association of
Echocardiography
Document Reviewers: Rosa Sicaria, Alec Vahanianb, and Jos R.T.C. Roelandtc
1DepartmentofCardiology,ValvularDiseaseClinic,UniversityHospital,Universite ´ deLie `ge,CHUduSartTilman,4000Lie `ge,Belgium;2OportoMedicalSchool,Porto,Portugal;3Division
of Noninvasive Cardiology, San Raffaele Hospital, IRCCS, Milan, Italy;4Department of Cardiology, ‘Carol Davila’ University of Medicine and Pharmacy, Bucharest, Romania;5Department
of Cardiology, University Hospital of Amiens, Picardie, France;6Department fu ¨r Innere Medizin, Kardiologie, Leipzig, Germany;7Cardiologie/Maladie Valvulaires Cardiaques Laboratoire
d’e ´chocardiographie CHU Henri Mondor, Cre ´teil, France;8Department of Cardiology, University of Padova, Padova, Italy;9University Clinic San Carlos. Madrid, Spain
aInstitute of Clinical Physiology, PISA, Italy;bHo ˆpital Bichat, Paris, France; andcDepartment of Cardiology, Thoraxcentre, Erasmus MC, Rotterdam, The Netherlands
Received 11 February 2010; accepted after revision 15 February 2010
Mitral and tricuspid are increasingly prevalent. Doppler echocardiography not only detects the presence of regurgitation but also permits to
understand mechanisms of regurgitation, quantification of its severity and repercussions. The present document aims to provide standards
for the assessment of mitral and tricuspid regurgitation.
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Keywords
Valvular regurgitation † Echocardiography † Recommendations † Mitral valve † Tricuspid valve
Introduction
The second part of the recommendations on the assessment of
valvular regurgitation focuses on mitral regurgitation (MR) and tri-
cuspid regurgitation (TR). As for the first part, the present docu-
ment is based upon a consensus of experts.1It provides clues
not only for MR and TR quantification but also elements on the
assessment of valve anatomy and cardiac function.
Mitral regurgitation
MR is increasingly prevalent in Europe despite the reduced inci-
dence of rheumatic disease.2The development of surgical mitral
valve repair introduced in the early seventies by Alain Carpentier
has dramatically changed the prognosis and the management of
patients presenting with severe MR. The possibility of repairing
the mitral valve imposes new responsibilities on the assessment
of MR by imaging which should provide precise information on
type and extent of anatomical lesions, mechanisms of regurgitation,
aetiology, amount of regurgitation, and reparability of the valve. It is
essential to distinguish between organic (primary) and functional
(secondary) MR which radically differs in their pathophysiology,
prognosis, and management.
Anatomy and function of the mitral valve
Normal mitral valve function depends on perfect function of the
complex interaction between the mitral leaflets, the subvalvular
apparatus (chordae tendineae and papillary muscles), the mitral
annulus, and the left ventricle (LV). An imperfection in any one
of these components can cause the valve to leak.3
*Corresponding author. Tel: +32 4 366 71 94, Fax: +32 4 366 71 95, Email: plancellotti@chu.ulg.ac.be
Published on behalf of the European Society of Cardiology. All rights reserved. & The Author 2010. For permissions please email: journals.permissions@oxfordjournals.org.
European Journal of Echocardiography (2010) 11, 307–332
doi:10.1093/ejechocard/jeq031

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Valvular leaflets
The normal mitral valve has two leaflets (each with a thickness
about 1 mm) that are attached at their bases to the fibromuscular
ring, and by their free edges to the subvalvular apparatus. The pos-
terior leaflet has a quadrangular shape and is attached to approxi-
mately two-thirds of the annular circumference; the anterior leaflet
attaches to the remaining one-third (Figure 1). The posterior leaflet
typically has two well defined indentations which divide the leaflet
into three individual scallops identified as P1, P2, and P3. The P1
scallop corresponds to the external, anterolateral portion of the
posterior leaflet, close to the anterior commissure and the left
atrium (LA) appendage. The P2 scallop is medium and more devel-
oped. The P3 scallop is internal, close to the posterior commissure
and the tricuspid annulus. The anterior leaflet has a semi-circular
shape and is in continuity with the non-coronary cusp of the
aortic valve, referred to as the intervalvular fibrosa. The free
edge of the anterior leaflet is usually continuous, without indenta-
tions. It is artificially divided into three portions A1, A2, and A3,
corresponding to the posterior scallops P1, P2, and P3. The com-
missures define a distinct area where the anterior and posterior
leaflets come together at their insertion into the annulus. Some-
times the commissures exist as well defined leaflet segments, but
more often this area is a subtle region. When the mitral valve is
closed, the line of contact between the leaflets is termed coapta-
tion line and the region of leaflet overlap is called the zone of
apposition.
By echocardiography, the presence and the extent of inadequate
tissue (e.g. calcifications), of excess leaflet tissue and the precise
localization of the leaflet lesions should be analysed. Describing
the mitral valve segmentation is particularly useful to precisely
define the anatomical lesions and the prolapsing segments in
patients with degenerative MR. For this purpose, transoesophageal
echocardiography (TEE) still remains the recommended approach
in many laboratories. However, in experienced hands, functional
assessment of MR by transthoracic echocardiography (TTE) pre-
dicts accurately valve reparability. Images with both approaches
are recorded using appropriate standardized views (Figures 2–6).4
Theshort-axisviewcanbeobtainedbyTTEorTEE,usingtheclas-
sical parasternal short-axis view and the transgastric viewat 08. This
view permits in diastole the assessment of the six scallops and the
two commissures. In systole, the localization of prolapse may be
identified by the localization of the origin of the regurgitant jet.
With TTE, a classical apical four-chamber view is obtained and
explores the anterior leaflet, the segments A3 and A2 and the pos-
terior leaflet in its external scallop P1. With TEE, different valvular
segments are observed which depend on the position of the probe
in the oesophagus which progresses from up to down. This
permits to observe successively A1 and P1 close to the anterolat-
eral commissure, A2 and P2 and finally A3 and P3 close to the pos-
teromedial commissure (at 40–608).
Parasternal long-axis view with TTE and sagittal view at 1208
with TEE show the medium portions of the leaflets (A2 and P2).
A bi-commissural view can be obtained in the apical two-chamber
view with TTE and a view at 40–608 with TEE showing the two
commissural regions and from left to right P3, A2, and P1. A two-
chamber view from the transgastric position, perpendicular to the
subvalvular apparatus permits to measure the length of the
chordae and the distances between the head of the papillary
muscle and the mitral annulus.
Real-time 3D TTE and/or TEE provide comprehensive visualiza-
tion of the different components of the mitral valve apparatus and
is probably the method of choice when available.5Real-time 3D
TEE is particularly useful in the dialogue between the echocardio-
grapher and the surgeon. Multiple views are available which permit
to precisely determine the localization and the extent of prolapse.
The ‘en face’ view seen from the LA perspective is identical to the
surgical view in the operating room. This view allows to perfectly
analysing the extent of commissural fusion in rheumatic MR. The
leaflet involvement in degenerative myxomatous disease is visual-
ized by 3D echo as bulging or protrusion of one or more segments
of a single or multiple mitral valve leaflets. In addition, the presence
of chordal rupture and extension of the concomitant annular
dilation can be assessed in the same view. Preoperatively, the
measurement by 3D echo of the surface of the anterior leaflet
could help to define the size of the annular ring.
Figure 1 Real-time 3D transoesophageal echocardiography
volume rendering of the mitral valve. Left: classical transoesopha-
geal echocardiography view; right: surgical view. A1, A2, A3,
anterior mitral valve scallops; P1, P2, P3, posterior mitral valve
scallops;ANTCOMM, anterolateral
COMM, posteromedial commissure.
commissure; POST
Figure 2 Mitral valvular segmentation analysis with 2D trans-
oesophageal echocardiography. Views obtained at 08: (A) Five-
chamber view depicting A1 and P1, (B) four-chamber view
depicting A2 and P2; (C) downward four-chamber view depicting
A3 and P3.
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Mitral annulus
The mitral annulus constitutes the anatomical junction between the
LV and the LA, and serves as insertion site for the leaflet tissue. It is
ovalandsaddleshaped.6Theanteriorportionofthemitralannulusis
attached to the fibrous trigones and is generally more developed
than the posterior annulus. Both parts of the annulus may dilate in
pathologic conditions. The anterior–posterior diameter can be
measured using real-time 3D or by conventional 2D in the
parasternal long-axis view. The diameter is compared with the
lengthoftheanteriorleafletmeasuredindiastole.Annulardilatation
is present when the ratio annulus/anterior leaflet is .1.3 or when
thediameteris .35 mm.7Thepresenceandextentofannularcalci-
fication is an important parameter to describe. The normal motion
andcontractionofthemitralannulusalsocontributestomaintaining
valve competence. The normal contraction of the mitral annulus
(decrease in annular area in systole) is 25%.8
Chordae tendineae
There are three sets of chordae arising from the papillary muscles.
They are classified according to their site of insertion between the
free margin and the base of leaflets. Marginal chordae (primary
Figure 3 Mitral valvular segmentation analysis with 2D trans-
oesophageal echocardiography. (A) Two-chamber view with a
counter clock wise mechanical rotation permitting to visualize
A1, P1, and the anterolateral commissure. (B) Two-chamber
view with a clock wise mechanical rotation permitting to visualize
A3, P3, and the posteromedial commissure. (C) Bicommissural
view. (D) View at 1208 visualizing A2 and P2.
Figure 4 Mitral valvular segmentation analysis with 2D trans-
oesophageal echocardiography (TEE) and transthoracic echocar-
diography (TTE). (A) 2D TTE parasternal long-axis view depicting
A2 and P2. (B) 2D TTE parasternal short-axis view depicting each
scallop. (C) 2D TEE view at 1208 visualizing A2 and P2. (D) 2D
TEE the transgastric view at 08 depicting each scallop.
Figure 5 2D transthoracic echocardiography of parasternal
long-axis view. (A) A2 and P2. (B) A1 and P1 (tilting of the
probe toward the aortic valve). (C) A3 and P3 (tilting of the
probe toward the tricuspid (Tr) valve).
Figure 6 Mitral valvular segmentation analysis with 2D trans-
oesophageal echocardiography (B and D) and transthoracic echo-
cardiography (A and C). (A) Four-chamber view depicting A3, A2,
and P1 and (C) bicommissural view. For B and D see above.
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chordae)areinsertedonthefreemarginoftheleafletsandfunctionto
preventprolapseoftheleafletmargin.Intermediatechordae(second-
arychordae)insertontheventricularsurfaceoftheleafletsandrelieve
valvular tissue of excesstension. Often two large secondary or ‘strut’
chordae can be individualized. They may be important in preserving
ventricular shape and function. Basal chordae (tertiary chordae) are
limited to the posterior leaflet and connect the leaflet base and
mitral annulus to the papillary muscle. Additional commissural
chordae arise from each papillary muscle. Rupture, calcification,
fusion, or redundancy of the chordae can lead to regurgitation.
Papillary muscles
Because the annulus resides in the left atrioventricular furrow, and
the chordae tendineae are connected to the LV via the papillary
muscles, mitral valve function is intimately related to LV function.
There are two papillary muscles arising from the LV: the anterolat-
eral papillary muscle is often composed of one body or head, and
the posteromedial papillary muscle usually with two bodies or
heads. Rupture, fibrotic elongation or displacement of the papillary
muscles may lead to MR.
Mitral valve analysis: recommendations
(1) TTE is recommended as the first-line imaging
modality for mitral valve analysis.
(2) TEE is advocated when TTE is of non-diagnostic
value or when further diagnostic refinement is
required.
(3) 3D-TEE or TTE is reasonable to provide additional
information in patients with complex mitral valve
lesion.
(4) TEE is not indicated in patients with a good-quality
TTE except in the operating room when a mitral
valve surgery is performed.
Key point
Valve analysis should integrate the assessment of the
aetiology, the lesion process and the type of dysfunction.
The distinction between a primary and a secondary
cause of MR is mandatory. The diameter of the mitral
annulus, the leaflet involved in the disease process and
the associatedvalvular lesions
described in the final report.
should becarefully
Aetiology and mechanism of mitral
regurgitation
Causes and mechanisms of MR are not synonymous. A particular
cause might produce regurgitation by different mechanisms. MR
is roughly classified as organic (primary) or functional (secondary).
Organic MR is due to intrinsic valvular disease whereas functional
MR is caused by regional and/or global LV remodelling without
structural abnormalities of the mitral valve. Causes of primary
MR include most commonly degenerative disease (Barlow, fibroe-
lastic degeneration, Marfan, Ehler’s-Danlos, annular calcification),
rheumatic disease, and endocarditis. Ruptured papillary muscle
secondary to myocardial infarction defined an organic ischaemic
MR. Causes of secondary MR include ischaemic heart disease
and cardiomyopathy.
Aetiology
Degenerative mitral regurgitation
Degenerative disease is the most common aetiology of MR. Several
terms are used that should be distinguished: (i) A billowing valve is
observed when a part of the mitral valve body protrudes into the
LA; the coaptation is, however, preserved beyond the annular
plane. MR is usually mild in this condition; (ii) A floppy valve is a
morphologic abnormality with thickened leaflet (diastolic thickness
.5 mm) due to redundant tissue; (iii) Mitral valve prolapse implies
that the coaptation line is behind the annular plane. With 2D echo,
the diagnosis of prolapse should be made in the parasternal or
eventually the apical long-axis view, but not in the apical four-
chamber view, because the saddle shaped annulus may lead to
false positive diagnosis (Figure 7). The most common phenotype
of mitral prolapse is diffuse myxomatous degeneration (Barlow’s
disease; Figures 8 and 9); (iv) Flail leaflet: this term is used when
the free edge of a leaflet is completely reversed in the LA (the
leaflet tip is directed towards the LA while in prolapse it is directed
towards the LV). Flail leaflet is usually a consequence of ruptured
chordae (degenerative MR or infective endocarditis). It affects
more frequently the posterior leaflet (.70% of cases) and is
usually associated with severe MR.
Rheumatic mitral regurgitation
Rheumatic MR is characterized by variable thickening of the leaflets
especially at the level of their free edge. Fibrosis of the chordae is
frequent, especially of those attached to the posterior valve
explaining the rigidity and reduced motion of the posterior
leaflet in diastole. In some patients, the posterior leaflet remains
Figure 7 (A) In normal mitral valve, the coaptation (red point)
occurs beyond the mitral annular plane (line); (B) billowing mitral
valve is observed when a part of the mitral valve body protrudes
into the left atrium (arrow); (C and D) mitral valve prolapse is
defined as abnormal systolic displacement of one (C: posterior
prolapse) or both leaflets into the left atrium below the
annular (D: bileaflet prolapse); (E) flail of the anterior leaflet
(arrow).
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in a semi-open position throughout the cardiac cycle and the
motion of the anterior leaflet in systole produces a false aspect
of prolapse.
Functional mitral regurgitation
Functional MR broadly denotes abnormal function of normal leaf-
lets in the context of impaired ventricular function resulting from
ischaemic heart disease or dilated cardiomyopathy.9It results
from an imbalance between tethering forces—annular dilatation,
LV dilatation, papillary muscles displacement, LV sphericity—and
closing forces—reduction of LV contractility, global LV dyssyn-
chrony, papillary muscle dyssynchrony, altered mitral systolic
annular contraction. Chronic functional ischaemic MR results, in
95% of the cases, from a type IIIb (systolic restriction of leaflet
motion) dysfunction. The restrictive motion occurs essentially
during systole and is most frequent in patients with previous pos-
terior infarction (asymmetric pattern; Figure 10).10In this setting,
the traction on the anterior leaflet by secondary chordae can
induce the so called ‘seagull sign’. In patients with idiopathic cardi-
omyopathy or with both anterior and inferior infarctions, both leaf-
lets exhibit a reduced systolic motion leading to incomplete
coaptation (symmetric pattern; Figure 11). Rarely, in ischaemic
Figure 10 Ischaemic mitral regurgitation with a predominant
posterior leaflet restriction (arrows) leading to an asymmetric
tenting pattern. The restriction on the anterior leaflet due exces-
sive stretching by the strut chordate provides the typical seagull
sign (white arrow). The colour jet is originating centrally but is
directed laterally toward the lateral wall of the left atrium.
Figure 11 Ischaemic mitral regurgitation with a bileaflet
restriction (arrows) leading to a symmetric tenting pattern. The
colour jet is originating and directed centrally into the left atrium.
Figure 9 3D-transoesophageal echocardiography rendering of
the mitral valve. (A) Posteromedial (POST-COMM) commissure
prolapse; (B) anterolateral (ANT-COMM) commissure prolapse;
(C) P2 prolapse; (D) flail of P3.
Figure 8 Example of severe Barlow’s disease with redundant
and thickened mitral valve.
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MR, the mechanism of MR is related to fibrosis and elongation of
the papillary muscle (Figure 12). On echo, the LV is dilated and
more spherical. The annulus is also usually dilated, becomes
more circular with lack of dynamic systolic contraction. A
number of anatomic measurements can be made that reflect the
pathophysiology of functional MR, including global and regional
LV remodelling and the severity of altered geometry of the
mitral valve apparatus (tenting area and coaptation distance;
Figure 13).11The location and extent of regional and global LV dys-
function are easily assessed in the classical views (parasternal long-
axis and short-axis and apical two, three, and four chamber views).
Thin (diastolic thickness ,5.5 mm) and hyper-echogenic ventricu-
lar segments usually imply the presence of transmural infarction.
Global LV remodelling is quantified by the measurements of LV
volumes and the calculation of the LV sphericity index. Regional
remodelling is quantified by the posterior and lateral displacements
of one or both papillary muscles. The tenting area is measured in
mid-systole as the area between the mitral annulus and the mitral
leaflets body. The apical displacement of the coaptation point
(coaptation distance) represents the distance between the mitral
annular plane and the point of coaptation.
Mechanisms of mitral regurgitation
Precise determination of the mechanism of MR is an essential com-
ponent of the echocardiographic examination, in particular when
mitral valve repair is considered. The Capentier’s functional classi-
fication is often used: (i) Type I: MR is determined by leaflet per-
foration (infective endocarditis) or more frequently by annular
dilatation; (ii) Type II: Excessive leaflet mobility accompanied by
displacement of the free edge of one or both leaflets beyond the
Figure 12 Ischaemic mitral regurgitation due to ischaemic
elongation of the posteromedial papillary muscle (red arrow).
Yellow arrow: anterior leaflet prolapse.
Figure 13 Echo morphologic parameters that are measured in ischeamic mitral regurgitation. (A) Global left ventricle remodelling [diameter,
left ventricle (LV) volumes, sphericity index (SI ¼ L/1; L, major axis; 1, minor axis)]. (B) Local LV remodelling (1, apical displacement of the
posteromedial papillary muscle; 2, second order chordate; 3, interpapillary muscle distance). (C) Mitral valve deformation (1, systolic tenting
area (TA); 2, coaptation distance (CD); 3, posterolateral angle (PLA)).
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mitral annular plane (mitral valve prolapse); (iii) Type III: The type
III is subdivided into type IIIa implying restricted leaflet motion
during both diastole and systole due to shortening of the
chordae and/or leaflet thickening such as in rheumatic disease,
and type IIIb when leaflet motion is restricted only during systole
(Figure 14).
Predictors of successful valve repair
Several echocardiographic parameters can help to identify patients
at risk of treatment failure. In organic MR, some predictors of
unsuccessful repair have been reported: the presence of a large
central regurgitant jet, severe annular dilatation (.50 mm), invol-
vement of ≥3 scallops especially if the anterior leaflet is involved,
and extensive valve calcification (Table 1).12Moreover, lack of valve
tissue is also an important predictor of unsuccessful repair both in
rheumatic valve disease and in patients who have had infective
endocarditis with large valve perforation.
In functional ischaemic MR, per-operatively (TEE), patients with a
mitral diastolic annulus diameter ≥37 mm, a systolic tenting area
≥1.6 cm2and a severe functional ischaemic MR could have a 50%
probabilityoffailureduringfollow-up.13Pre-operatively(TTE),acoap-
tation distance .1 cm, a systolic tenting area .2.5 cm2, a posterior
leaflet angle .458 (indicating a high posterior leaflet restriction), a
central regurgitant jet (indicating a severe restriction of both leaflets
in patients with severe functional ischaemic MR), the presence of
complex jets originating centrally and posteromedially, and a severe
LV enlargement (low likelihood of reverse LV remodelling after
repair and poor late outcome) increase the risk of mitral valve repair
failure.Takingtheseparametersaltogethercouldreducethefrequency
of postoperative functional ischaemic MR recurrence (Table 2).11
Key point
The echocardiographic report should provide clues on
the likelihood of valve repair.
Risk of systolic anterior motion after mitral valve surgery
The development of systolic anterior motion (SAM) of the mitral
valve with LV outflow tract obstruction after mitral valve repair
can lead to severe post-operative haemodynamic instability.
Factors predisposing patients to SAM are the presence of a myx-
omatous mitral valve with redundant leaflets (excessive anterior
leaflet tissue), a non-dilated hyperdynamic LV, and a short distance
between the mitral valve coaptation point and the ventricular
septum after repair.
Assessment of mitral regurgitation
severity
Colour flow Doppler
Colour flow imaging
Colour flow imaging, although less accurate, is the most common
way to assess MR severity.14The general assumption is that as the
severity of the MR increases, the size and the extent of the jet
into the LA also increases. Theoretically, larger colour jets that
extend deep into the LA represent more MR than small thin jets
that appear just beyond the mitral leaflets. However, the relation
betweenjet size and MR severitypresentsa large range of variability
because in addition to regurgitation severity,the colour flow display
Figure 14 Mechanisms of mitral regurgitation according to the
Capentier’s functional classification.
...............................................................................................................................................................................
DegenerativeII: Localized prolapse (P2 and/or A2)No/Localized
Ischaemic/Functional I or IIIbNo
Barlow II: Extensive prolapse (≥3 scallops,
posterior commissure)
RheumaticIIIa but pliable anterior leafletLocalized
Severe BarlowII: Extensive prolapse (≥3 scallops,
anterior commissure)
EndocarditisII: Prolapse but destructive lesionsNo
RheumaticIIIa but stiff anterior leafletExtensive (annulus + leaflets)
Ischaemic/FunctionalIIIb but severe valvular deformationNo
Table 1
Probability of successful mitral valve repair in organic mitral regurgitation based on echo findings
AetiologyDysfunctionCalcificationMitral annulus dilatationProbability of repair
Mild/Moderate
Moderate
Moderate
Feasible
Feasible
Difficult Localized (annulus)
Moderate
Severe
Difficult
UnlikelyExtensive (annulus + leaflets)
No/Mild
Moderate/Severe
No or Severe
Unlikely
Unlikely
Unlikely
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depends on many technical and haemodynamic factors. Fora similar
severity, patients with increased LA pressure or with eccentric jets
that hug the LA wall or in whom the LA is enlarged may exhibit
smaller jets area than those with normal LA pressure and size or
with central jets (Figure 15).15In acute MR, even centrally directed
jets may be misleadingly small. Furthermore, as this method is a
sourceofmanyerrors,itisnotrecommendedtoassessMRseverity.
Nevertheless,thedetectionofalargeeccentricjetadhering,swirling
and reaching the posterior wall of the LA is in favour of significant
MR. Conversely, small thin jets that appear just beyond the mitral
leaflets usually indicate mild MR.
Key point
The colour flow area of the regurgitant jet is not rec-
ommended to quantify the severity of MR. The colour
flow imaging should only be used for diagnosing MR.
A more quantitative approach is required when more
than a small central MR jet is observed.
Vena contracta width
The vena contracta is the area of the jet as it leaves the regurgitant
orifice; it reflects thus the regurgitant orifice area.16–18The vena
contracta is typically imaged in a view perpendicular to the com-
missural line (e.g. the parasternal long-axis or the apical four-
chamber view) using a careful probe angulation to optimize the
flow image, an adapted Nyquist limit (colour Doppler scale)
(40–70 cm/s) to perfectly identify the neck or narrowest portion
of the jet and the narrowest Doppler colour sector scan
coupled with the zoom mode to improve resolution and measure-
ment accuracy (Figure 16). Averaging measurements over at least
two to three beats and using two orthogonal planes whenever
possible is recommended. A vena contracta ,3 mm indicates
mild MR whereas a width ≥7 mm defines severe MR. Intermediate
values are not accurate at distinguishing moderate from mild or
severe MR (large overlap); they require the use of another
method for confirmation.
The concept of vena contracta is based on the assumption that
the regurgitant orifice is almost circular. The orifice is roughly cir-
cular in organic MR; although in functional MR, it appears to be
rather elongated along the mitral coaptation line and non-
circular.19,20Thus, the vena contracta could appear at the same
time narrow in four-chamber view and broad in two-chamber
view. Moreover, conventional 2D colour Doppler imaging does
not provide appropriate orientation of 2D scan planes to obtain
an accurate cross-sectional view of the vena contracta. The vena
contracta can be classically well identified in both central and
eccentric jets. In case of multiple MR jets, the respective widths
of the vena contracta are not additive. Such characteristics may
be better appreciated and measured on 3D echocardiography. In
functional MR, a mean vena contracta width (four- and two-
chamber views) has been shown to be better correlated with
the 3D vena contracta. A mean value .8 mm on 2D echo
(Figure 17) has been reported to define severe MR for all
Figure 15 Visual assessment of mitral regurgitant jet using
colour-flow imaging. Examples of two patients with severe
mitral regurgitation. (A) Large central jet. (B) Large eccentric jet
with a clear Coanda effect. CV, four-chamber view.
Figure 16 Semi-quantitative assessment of mitral regurgitation
severity using the vena contracta width (VC). The three com-
ponents of the regurgitant jet (flow convergence zone, vena con-
tracta, jet turbulence) are obtained. CV, chamber view; PT-LAX,
parasternal long-axis view.
Table 2
valve repair in functional mitral regurgitation11
Unfavourable TTE characteristics for mitral
Mitral valve deformation
Coaptation distance ≥1 cm
Tenting area .2.5–3 cm2
Complex jets
Posterolateral angle .458
Local LV remodelling
Interpapillary muscle distance .20 mm
Posterior papillary-fibrosa distance .40 mm
Lateral wall motion abnormality
Global LV remodelling
EDD . 65 mm, ESD . 51 mm (ESV . 140 mL)
Systolic sphericity index .0.7
EDD, end-diastolic diameter; ESD, end-systolic diameter; ESV, end-systolic
volume; LV, left ventricle.
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aetiologies of MR including functional MR.21–23These data need,
however, to be confirmed in further studies.
Key point
When feasible, the measurement of vena contracta is
recommended to quantify MR. Intermediate vena con-
tracta values (3–7 mm) need confirmation by a more
quantitative method, when feasible. The vena contracta
can often be obtained in eccentric jet. In case of multiple
jets, the respective values of the vena contracta width are
not additive. The assessment of the vena contracta by 3D
echo is still reserved for research purposes.
The flow convergence method
Over the last few years, the flow convergence method has gained
interest. It is now by far the most recommended quantitative
approachwheneverfeasible.24The apicalfour-chamber viewisclas-
sicallyrecommendedforoptimalvisualizationoftheproximalisove-
locity surface area (PISA). However, the parasternal long- or
short-axis view is often useful for visualization of the PISA in case
of anterior mitral valve prolapse. The area of interest is optimized
by lowering imaging depth and reducing the Nyquist limit to
?15–40 cm/s. The radius of the PISA is measured at mid-systole
using the first aliasing. Regurgitant volume (R Vol) and effective
regurgitant orifice area (EROA) are obtained using the standard
formula (Figure 18). Qualitatively, the presence of flow convergence
at a Nyquist limit of 50–60 cm/s should alert to the presence of
significant MR.Grading ofseverityoforganicMRclassifiesregurgita-
tion as mild, moderate or severe, and sub-classifies the moderate
regurgitation group into ‘mild-to-moderate’ (EROA of 20–29 mm
or a R Vol of 30–44 mL) and ‘moderate-to-severe’ (EROA of
30–39 mm2or a R Vol of 45–59 mL). Quantitatively, organic MR
Figure 17 Semi-quantitative assessment of mitral regurgitation
(MR) severity using the vena contracta width (VC) obtained from
the apical four-chamber and two-chamber views (CV) in a patient
with ischaemic functional MR. The mean vena contracta is calcu-
lated [(6 + 10)/2 ¼ 8 mm].
Figure 18 Quantitative assessment of mitral regurgitation (MR) severity using the proximal isovelocity surface area method. Stepwise analysis
of MR: (A) Apical four-chamber view (CV); (B) colour-flow display; (C) zoom of the selected zone; (D) downward shift of zero baseline to
obtain an hemispheric proximal isovelocity surface area; (E) measure of the proximal isovelocity surface area radius using the first aliasing;
(F) continuous wave Doppler of MR jet allowing calculation the effective regurgitant orifice area (EROA) and regurgitant volume (R Vol).
TVI, time-velocity integral.
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is considered severe if EROA is ≥40 mm2and R Vol ≥ 60 mL. In
ischaemic MR, the thresholds of severity, which are of prognostic
value, are 20 mm2and 30 mL, respectively.25EROA is the most
robust parameter as it represents a marker of lesion severity. A
large EROA can lead to large regurgitant kinetic energy (large R
Vol) but also to potential energy, with low R Vol but high LA
pressure.
As mentioned in the first part of the EAE recommendations on
the assessment of valvular regurgitation, the PISA method faces
several advantages and limitations (Figures 19–21).1,26Colour
M-mode is important to assess the variation of the PISA during
systole (Figure 22). The PISA radius is most frequently constant
in patients with rheumatic MR. It frequently increases progressively
with a maximum during the second half of systole in patients with
mitral valve prolapse. In the presence of functional MR, there is a
dynamic variation of regurgitant orifice area with early and late sys-
tolic peaks and a mid-systolic decrease. These changes reflects the
phasic variation in transmitral pressure that acts to close the mitral
leaflets more effectively when pressure reaches its peak in mid-
systole.27The PISA method is based on the assumption of hemi-
spheric symmetry of the velocity distribution proximal to the
regurgitant lesion, which may not hold for eccentric jets, multiple
jets, or complex or elliptical regurgitant orifices. Practically, the
geometry of the PISA varies, depending on the shape of the
orifice and mitral valve leaflets surrounding the orifice. In func-
tional MR, the PISA might look like an ellipsoidal shape and two
separate MR jets originating from the medial and lateral sides of
the coaptation line can be observed on 2D echo. When the
shape of the flow convergence zone is not a hemisphere, the
PISA method may underestimate the degree of functional MR, par-
ticularly when the ratio of long-axis length to short-axis length of
the 3D regurgitant orifice is .1.5.28When the EROA is calculated
with the hemispheric assumption (using the vertical PISA), the
horizontal length of PISA is ignored. In organic MR, the shape of
the PISA is rounder, which minimizes the risk of EROA underesti-
mation (Figure 23). These findings could explain why the threshold
used to define a severe functional MR is inferior to that used for
organic MR. Careful consideration of the 3D geometry of PISA
may be of interest in evaluating the severity of functional MR.
The best 3D echo method to quantitate MR severity is still not
defined.
Figure 19 To avoid the underestimation of the regurgitant
volume the ratio of the aliasing velocity (Va) to peak orifice vel-
ocity (vel) is maintained ,10%.
Figure 20 Example of eccentric mitral regurgitation that can still be perfectly assessed by using the proximal isovelocity surface area method.
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Key point
When
ommended to quantitate the severity of MR. It can be
used in both central and eccentric jets. An EROA ≥ ≥
feasible,the PISAmethod ishighlyrec-
40 mm2or a R Vol ≥ ≥ 60 mL indicates severe organic MR.
In functional ischaemic MR, an EROA ≥ ≥ 20 mm2or a R
Vol ≥ ≥ 30 mL identifies a subset of patients at increased
risk of cardiovascular events.
Pulsed Doppler
Doppler volumetric method
Quantitative PW Doppler method can be used as an additive or
alternative method, especially when the PISA and the vena con-
tracta are not accurate or not applicable. This approach is time
consuming and is associated with several drawbacks.1,29
Key point
The Doppler volumetric method is a time-consuming
approach that is not recommended as a first line
method to quantify MR severity.
Anterograde velocity of mitral inflow: mitral to aortic time-velocity
integral (TVI) ratio
In the absence of mitral stenosis, the increase is transmitral flow
that occurs with increasing MR severity can be detected as
higher flow velocities during early diastolic filling (increased E vel-
ocity). In the absence of mitral stenosis, a peak E velocity .1.5 m/s
suggests severe MR. Conversely, a dominant A wave (atrial con-
traction) basically excludes severe MR. These patterns are more
applicable in patients older than 50 years old or in conditions of
impaired myocardial relaxation. The pulsed Doppler mitral to
aortic TVI ratio is also used as an easily measured index for the
quantification of isolated pure organic MR. Mitral inflow Doppler
tracings are obtained at the mitral leaflet tips and aortic flow at
the annulus level in the apical four-chamber view. A TVI ratio
Figure 22 Four examples of flow convergence zone changes during systole using colour M-Mode. (A and B) Functional mitral regurgitation
(A: early and late peaks and mid-systolic decreases; B: early systolic peak), (C) rheumatic mitral regurgitation with a end-systolic decrease in flow
convergence zone, (D) M mitral valve prolaspe (late systolic enhancement).
Figure 21 (A) Example of a flat flow convergence zone; (B)
presence of two jets; (C and D) distorted and constrained flow
convergence zone by the lateral myocardial wall.
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.1.4 strongly suggests severe MR whereas a TVI ratio ,1 is in
favour of mild MR (Figure 24).30
Pulmonary venous flow
Pulsed Doppler evaluation of pulmonary venous flow pattern
is another aid for grading the severity of MR (Figure 25).31
In normal individuals, a positive systolic wave (S) followed
by a smaller diastolic wave (D) is classically seen in the
absence of diastolic dysfunction. With increasing severity of
MR, there is a decrease of the S wave velocity. In severe
MR, the S wave becomes frankly reversed if the jet is directed
into the sampled vein. As unilateral pulmonary flow reversal
can occur at the site of eccentric MR jets, sampling through
all pulmonary veins is recommended, especially during trans-
oesophageal echocardiography. Although, evaluation of right
upper pulmonary flow can often be obtained using TTE,
evaluation is best using TEE with the pulse Doppler sample
placed about 1 cm deep into the pulmonary vein. Atrial fibril-
lation and elevated LA pressure from any cause can blunt
forward systolic pulmonary vein flow. Therefore, blunting of
pulmonary venous flow lacks of specificity for the diagnosis
of severe MR.
Key point
Both the pulsed Doppler mitral to aortic TVI ratio and
the systolic pulmonary flow reversal are specific for severe
MR. They represent the strongest additional parameters
for evaluating MR severity.
Figure 24 Three examples of various degrees of mitral regurgitation (MR), mild (A), moderate (B), and severe (C) are provided. The regur-
gitant jet as well as the mitral E wave velocity increase with the severity of MR. In severe MR, the continuous wave Doppler signal of the regur-
gitant jet is truncated, triangular and intense. Notching of the continuous wave envelope (cut-off sign) can occur in severe MR. TVI, time-velocity
integral.
Figure 23 3D shape of the flow convergence in functional (A)
(hemielliptic) and organic mitral regurgitation (B) (hemispheric).
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Continuous wave Doppler of mitral regurgitation jet
Peak MR jet velocities by CW Doppler typically range between 4
and 6 m/s. This reflects the high systolic pressure gradient between
the LV and LA. The velocity itself does not provide useful infor-
mation about the severity of MR. Conversely, the signal intensity
(jet density) of the CW envelope of the MR jet can be a qualitative
guide to MR severity. A dense MR signal with a full envelope indi-
cates more severe MR than a faint signal. The CW Doppler envel-
ope may be truncated (notch) with a triangular contour and an
early peak velocity (blunt). This indicates elevated LA pressure
or a prominent regurgitant pressure wave in the LA due to
severe MR. In eccentric MR, it may be difficult to record the full
CW envelope of the jet because of its eccentricity, while the
signal intensity shows dense features.
Key point
The CW Doppler density of the MR jet is a qualitative
parameter of MR severity.
Consequences of mitral regurgitation
The presence of severe MR has significant haemodynamic effects,
primarily on the LV and LA.
Left ventricle size and function
The LV dimensions and ejection fraction reflect the heart’s ability to
adapt to increased volume load. In the chronic compensated phase
(the patient could be asymptomatic), the forward stroke volume is
maintainedthroughanincreaseinLVejectionfraction.Suchpatients
typicallyhaveLVejectionfraction .65%.Evenintheacutestage,the
LVejectionfractionincreaseinresponsetotheincreasedpreload.In
the chronic decompensated phase (the patient could still be asymp-
tomatic or may fail to recognize deterioration in clinical status), the
forwardstroke volumedecreasesandtheLApressureincreases sig-
nificantly.TheLVcontractilitycanthusdecreasesilentlyandirrever-
sibly. However, the LV ejection fraction may still be in the low
normalrangedespitethepresenceofsignificantmuscledysfunction.
In the current guidelines, surgery is recommended in asymptomatic
patients with severe organic MR when the LV ejection fraction is
≤60%. The end-systolic diameter is less preload dependent than
the ejection fraction and could in some cases be more appropriate
to monitor global LV function. An end-systolic diameter .45 mm
(or ≥40 mm or .22 mm/m2, AHA/ACC), also indicates the need
for mitral valve surgery in these patients.2,32,33New parameters
are currently available for a better assessment of LV function. A sys-
tolic tissue Doppler velocity measured at the lateral annulus
,10.5 cm/s has been shown to identify subclinical LV dysfunction
andtopredictpost-operativeLVdysfunctioninpatientswithasymp-
tomatic organic MR.34Strain imaging allows a more accurate esti-
mation of myocardial contractility than tissue Doppler velocities.
It is not influenced by translationor pathologic tethering to adjacent
myocardial segments, which affect myocardial velocity measure-
ments. In MR, strain has been shown to decrease even before LV
end-systolic diameter exceeds 45 mm.35A resting longitudinal
strain rate value ,1.07/s (average of 12 basal and mid segments)
is associated with the absence of contractile reserve during exercise
and thus with subclinical latent LV dysfunction.36By using the
2D-speckle tracking imaging (an angle independent method), a
global longitudinal strain ,18.1% has been associated with post-
operative LV dysfunction.37Practically, the incremental value of
tissue Doppler and strain imaging for identifying latent LV dysfunc-
tion remains to be determined.
Left atrial size and pulmonary pressures
TheLAdilatesinresponsetochronicvolumeandpressureoverload.A
normalsizedLAisnotnormallyassociatedwithsignificantMRunlessit
is acute, in which case the valve appearance is likely to be grossly
abnormal. LA remodelling (diameter .40–50 mm or LA volume
index .40 mL/m2) may predict onset of atrial fibrillation and poor
prognosis in patients with organic MR.38Conversely, MV repair
leadstoLAreverseremodelling,theextentofwhichisrelatedtopre-
operativeLAsizeandtoproceduralsuccess.39Theexcessregurgitant
bloodenteringintheLAmayinduceacutelyorchronicallyaprogress-
ive rise in pulmonary pressure. The presence of TR even if it is mild,
permits the estimation of systolic pulmonary arterial pressure.
Recommendation for mitral valve repair is a class IIawhen pulmonary
arterial systolic pressure is .50 mm Hg at rest.
Key point
When MR is more than mild MR, providing the LV diam-
eters, volumes and ejection fraction as well as the LA
dimensions (preferably LA volume) and the pulmonary
arterial systolic pressure in the final echocardiographic
report is mandatory.1The assessment of regional myocar-
dial function (systolic myocardial velocities, strain, strain
rate) is reasonable particularly in asymptomatic patients
with severe organic MR and borderline values in terms
of LV ejection fraction (60–65%) or LV end-systolic diam-
eter (closed to 40 mm or 22 mm/m2).
Role of exercise echocardiography
Organic mitral regurgitation
InasymptomaticpatientswithsevereMR,exercisestressechocardio-
graphy may help identify patients with unrecognized symptoms or
subclinical latent LV dysfunction. Moreover, exercise echocardiogra-
phy may also be helpful in patients with equivocal symptoms out of
proportion of MR severity at rest. Worsening of MR severity, a
marked increase in pulmonary arterial pressure, impaired exercise
Figure 25 (A) Normal pulmonary vein flow pattern; (B) blunt
forward systolic pulmonary vein flow in a patient with moderate
mitral regurgitation (MR); (C) reversed systolic pulmonary flow in
a patient with severe MR. S, systolic wave; D, diastolic wave.
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capacity, and the occurrence of symptoms during exercise echocar-
diography can be useful findings to identify a subset of patients at
higher risk who may benefit from early surgery.40A pulmonary
artery systolic pressure .60 mmHg during exercise has been
suggested as a threshold value above which asymptomatic patients
with severe MR might be referred for surgical valve repair. Although
the inclusion of pulmonary hypertension as an indication for valve
surgery in the guidelines seems logical from a pathophysiological
standpoint, there are, surprisingly, very limited outcome data to
support this recommendation as well as the selected cut-off value
forpulmonaryarterialpressure(.60 mmHg,ACC/AHA).Theappli-
cation of stress echocardiography in organic MR is rated as a class IIa
recommendation with level of evidence C in the ACC/AHA guide-
lines. To note, the place of stress echocardiography in this setting is
not defined in the ESC recommendations, probably because of lack
of robust data. An inability to increase the LV ejection fraction
(,4%) or reduce the end-systolic volume after treadmill exercise
has been shown to reflect the presence of an impaired contractile
reserve,andtobereliableearlymarkersforprogressivedeterioration
in myocardial contractility.36The absence of contractile reserve has
also been associated with post-operative morbidity. A small change
in 2D-speckle global longitudinal strain at exercise (,1.9%) has also
beencorrelatedwithpost-operativeLVdysfunction.Theincremental
value of these cut-off values remains to be confirmed.37
Key point
Exercise echocardiography is useful in asymptomatic
patients with severe organic MR and borderline values of
LV ejection fraction (60–65%) or LV end-systolic diameter
(closed to 40 mm or 22 mm/m2). The absence of contrac-
tile reserve could identify patients at increased risk of car-
diovascular events. Moreover, exercise echocardiography
may also be helpful in patients with equivocal symptoms
out of proportion of MR severity at rest.
Functional mitral regurgitation
Quantitation of functional MR during exercise is feasible using the
PISA method.41The degree of MR at rest is unrelated to
exercise-induced changes in ERO.8Dynamic MR is strongly
related to exercise-induced changes in systolic tenting area and
to intermittent changes in LV synchronicity. Large exercise-induced
increases in functional ischaemic MR (EROA ≥ 13 mm2) are
associated with dyspnea or acute pulmonary oedema.42,43
Dynamic MR also predicts mortality and hospitalization for heart
failure. Exercise stress echocardiography may thus unmask haemo-
dynamically significant MR in patients with functional ischaemic LV
systolic dysfunction and only mild to moderate MR at rest, and in
doing so identify patients at higher risk for heart failure and death.
Exercise Doppler echocardiography might provide useful infor-
mation in the following patients with ischaemic MR: (i) those
with exertional dyspnea out of proportion to the severity of
resting LV dysfunction or MR; (ii) those in whom acute pulmonary
edema occurs without an obvious cause; and (iii) those with mod-
erate MR before surgical revascularization.
Key point
Exercise echocardiography is useful in patients with
functional ischaemic MR and chronic LV systolic dysfunc-
tion to unmask the dynamic behaviour of MR. Patients
with an increase in EROA by ≥ ≥13 mm2are patients at
increased risk of cardiovascular events. In these patients,
exercise echocardiography also helps to identify the pres-
ence and extent of viable myocardium at jeopardy.
Integrating indices of severity
Echocardiographic assessment of MR includes integration of data
from 2D/3D imaging of the valve and ventricle as well as
Doppler measures of regurgitation severity (Table 3). Effort
should be made to quantify the degree of regurgitation, except
in the presence of mild or less MR. Both the vena contracta
width and the PISA method are recommended. Adjunctive par-
ameters help to consolidate about the severity of MR and
should be widely used particularly when there is discordance
between the quantified degree of MR and the clinical context.
For instance, a modest regurgitant volume reflects severe MR
when it develops acutely into a small, non-compliant LA and it
may cause pulmonary congestion and systemic hypotension.
Advantages and limitations of the various echo Doppler par-
ameters used in assessing MR severity are detailed in Table 4.
Recommended follow-up
Moderate organic MR requires clinical examination every year and
an echocardiogram every 2 years. In patients with severe organic
MR, clinical assessment is needed every 6 months and an echocar-
diogram every 1 year. If the ejection fraction is 60–65% and/or if
end-systolic diameter is closed to 40 or 22 mm/m2, the echocar-
diogram should be performed every 6 months.1Progression of
MR severity is frequent with important individual differences.
The average yearly increase in regurgitant volume is 7.5 mL and
5.9 mm2in EROA.44In addition, the progression of other par-
ameters need to be assessed: the increase in annular size, the
development of a flail leaflet, the evolution of LV end-systolic
dimension, LV ejection fraction, LA area or volume, pulmonary sys-
tolic arterial pressure, exercise capacity, and occurrence of atrial
arrhythmias.
Tricuspid regurgitation
TR is a common insufficiency. Since it is mostly asymptomatic and
not easily audible on physical examination, it is frequently only
diagnosed by echocardiography performed for another indication.
Although a mild degree of TR is frequent and benign, moderate
and severe TR are associated with poor prognosis.
Anatomy and function of the tricuspid
valve
The tricuspid valve complex is similar to the mitral valve but has
greater variability. It consists of the annulus, leaflets, right ventricle
(RV), papillary muscles, and chordae tendineae. The tricuspid valve
lays between the right atrium (RA) and the RV and is placed in a
slightly more apical position than the mitral valve.45
The tricuspid valve has three leaflets of unequal size: the
anterior leaflet is usually the largest and extends from the infundi-
bula region anteriorly to the inferolateral wall posteriorly; the
septal leaflet extends from the interventricular septum to the
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posterior ventricular border; the posterior leaflet attaches along
the posterior margin of the annulus from the septum to the infer-
olateral wall. The insertion of the septal leaflet of the tricuspid
valve is characteristically apical relative to the septal insertion of
the anterior mitral leaflet. The three main TTE views allowing
the tricuspid valve visualization are the parasternal, the apical four-
chamber and the subcostal views. Parasternal long-axis view of the
RV inflow is obtained by tilting the probe inferomedially and rotat-
ing it slightly clockwise from the parasternal long-axis view of the
LV. This incidence reveals the anterior tricuspid leaflet (near the
aortic valve) and the posterior tricuspid leaflet. Parasternal short-
axis view, at the level of the aortic valve, apical four-chamber view
and subcostal four-chamber view visualize the septal and the
anterior tricuspid leaflets (Figure 26). TEE for the tricuspid valve
is possible with the four-chamber view at 08 in the basal transoe-
sophageal and oesogastric junction planes. TEE is of interest for the
diagnosis of endocarditis when suspected. It is particularly essential
to diagnose venous catheters and pacemakers lead infection
because TTE is often non diagnostic in these settings. TEE can
also help accurate tricuspid valve chordae visualization when trau-
matic rupture is suspected with TTE. However, it is rarely possible
to visualize by 2D echo the three leaflets simultaneously. Real-time
3D TTE is now routinely available and allows, with its unique capa-
bility of obtaining a short-axis plane of the tricuspid valve, simul-
taneous visualization of the three leaflets moving during the
cardiac cycle and their attachment to the tricuspid annulus.463D
echo supplements 2D echo and TEE with detailed images of the
morphology of the valve including leaflets size and thickness,
annulus shape and size, myocardial walls, and their anatomic
relationships.
The tricuspid annulus, providing a firm support for the tricuspid
leaflets insertion, is slightly larger than the mitral valve annulus.
Thetricuspid annulusshows anon-planarstructurewith anelliptical
saddle-shaped pattern, having two high points (oriented superiorly
towards the RA) and two low points (oriented inferiorly toward
the RV that is best seen in mid-systole). Normal tricuspid valve
annulus diameter in adults is 28+5 mm in the four-chamber
view. Significant tricuspid annular dilatation is defined by a diastolic
diameter of .21 mm/m2(.35 mm). A correlation exists between
tricuspid annulus diameter and TR severity: a systolic tricuspid
annulus diameter .3.2 cm or a diastolic tricuspid annulus diameter
.3.4 cm are often markers in favour of more significant TR. The
normal motion and contraction of the tricuspid annulus also con-
tributes to maintaining valve competence. The normal contraction
(decrease in annular area in systole) of the tricuspid annulus is
25%. These reference measures are currently used to propose tri-
cuspid valve repair at the time of left-sided valve surgery.
However, as the shape of the tricuspid annulus is not circular but
oval, with a minor and a major diameter, the 2D echo measurement
of the tricuspid annulus diameters (apical four-chamber view, para-
sternal short-axis view) systematically underestimate the actual tri-
cuspid annulus size by 3D echo. As a consequence, 65% of patients
...............................................................................................................................................................................
Qualitative
MV morphologyNormal/Abnormal Normal/Abnormal
Colour flow MR jetSmall, centralIntermediate
Table 3
Grading the severity of organic mitral regurgitation
ParametersMild Moderate Severe
Flail lefleat/Ruptured PMs
Very large central jet or eccentric jet adhering,
swirling and reaching the posterior wall of the LA
Large
Dense/Triangular
Flow convergence zonea
CW signal of MR jet
Semi-quantitative
VC width (mm)
Pulmonary vein flow
Mitral inflow
TVI mit /TVI Ao
Quantitative
EROA (mm2)
R Vol (mL)
+ LV and LA size and the systolic pulmonary pressureg
No or small
Faint/Parabolic
Intermediate
Dense/Parabolic
,3
Systolic dominance
A wave dominantd
,1
Intermediate
Systolic blunting
Variable
Intermediate
≥7 (.8 for biplane)b
Systolic flow reversalc
E wave dominant (.1.5 cm/s)e
.1.4
,20
,30
20–29; 30–39f
30–44; 45–59f
≥40
≥60
CW, continuous-wave; LA, left atrium; EROA, effective regurgitant orifice area; LV, left ventricle; MR, mitral regurgitation; R Vol, regurgitant volume; VC, vena contracta.
aAt a Nyquist limit of 50–60 cm/s
bFor average between apical four- and two-chamber views.
cUnless other reasons of systolic blunting (atrial fibrillation, elevated LA pressure).
dUsually after 50 years of age;
ein the absence of other causes of elevated LA pressure and of mitral stenosis.
fGrading of severity of organic MR classifies regurgitation as mild, moderate or severe, and sub-classifies the moderate regurgitation group into ‘mild-to-moderate’ (EROA of
20–29 mm or a R Vol of 30–44 mL) and ‘moderate-to-severe’ (EROA of 30–39 mm2or a R Vol of 45–59 mL).
gUnless for other reasons, the LA and LV size and the pulmonary pressure are usually normal in patients with mild MR. In acute severe MR, the pulmonary pressures are usually
elevated while the LV size is still often normal. In chronic severe MR, the LV is classically dilated. Accepted cut-off values for non significant left-sided chambers enlargement: LA
volume ,36 mL/m2, LV end-diastolic diameter ,56 mm, LV end-diastolic volume ,82 mL/m2, LV end-systolic diameter ,40 mm, LV end-systolic volume ,30 mL/m2, LA
diameter ,39 mm, LA volume ,29 mL/m2.
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321