Article

Cardiac improvement during mechanical circulatory support: a prospective multicenter study of the LVAD Working Group.

Albert Einstein College of Medicine, Center for Advanced Cardiac Therapy, 3400 Bainbridge Ave, 7th Floor, Bronx, NY 10467-2490, USA.
Circulation (impact factor: 14.74). 05/2007; 115(19):2497-505. DOI:10.1161/CIRCULATIONAHA.106.633180 pp.2497-505
Source: PubMed

ABSTRACT Myocardial recovery after left ventricular assist device (LVAD) support has been reported. The LVAD Working Group Recovery Study was a prospective multicenter trial to assess the incidence of myocardial recovery in patients bridged to cardiac transplantation.
After LVAD implantation, patients were evaluated with the use of rest echocardiograms with partial LVAD support and cardiopulmonary exercise testing. Dobutamine echocardiography with hemodynamic measurements was performed in those patients with left ventricular ejection fraction >40% during resting studies. Histological analysis was performed on myocardial samples taken at LVAD implantation and explantation. Sixty-seven LVAD patients with heart failure participated in the study. After 30 days, significant improvement occurred in left ventricular ejection fraction (17+/-7% versus 34+/-12%; P<0.001) and reductions in left ventricular end-diastolic diameter (7.1+/-1.2 versus 5.1+/-1.1 cm; P<0.001) and left ventricular mass (320+/-113 versus 194+/-79 g; P<0.001) compared with before LVAD. Thirty-four percent of patients had left ventricular ejection fraction >40% with partial device support. Left ventricular ejection fraction decreased over time to pre-LVAD measurement by 120 days. Peak VO2 improved with mechanical support (13.7+/-4.2 versus 18.9+/-5.5 mL/kg per minute, 30 versus 120 days; P<0.001). Tissue analysis revealed significant reductions in myocyte size, collagen content, and cardiac tumor necrosis factor-alpha. Six subjects (9%) underwent LVAD explantation for recovery.
Cardiac function improves significantly after device implantation. Although cellular recovery and improvement in ventricular function are observed, the degree of clinical recovery is insufficient for device explantation in most patients with chronic heart failure.

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Keywords

cardiac tumor necrosis factor-alpha
 
cellular recovery
 
clinical recovery
 
device implantation
 
Left ventricular ejection fraction
 
LVAD implantation
 
LVAD patients
 
mechanical support
 
myocardial recovery
 
myocardial samples
 
myocyte size
 
partial device support
 
partial LVAD support
 
Peak VO2
 
pre-LVAD measurement
 
rest echocardiograms
 
resting studies
 
significant reductions
 
ventricular end-diastolic diameter
 
ventricular mass