[Show abstract][Hide abstract] ABSTRACT: Valve repair is currently performed to treat mitral regurgitation, but aortic valve repair remains a surgical challenge. In contrast, aortic valve replacement leads to complications and constraints on the patients' quality of life and valve durability. The mechanisms that produce malcoaptation of the aortic leaflets, with resultant insufficiency, are mainly due to prolapse or retraction of the leaflets. Thus, a new strategy has been proposed to correct valvular insufficiency, using magnetic force.
Low-profile permanent magnets were implanted in seven sheep, under cardiopulmonary bypass (CPB), through a transverse aortotomy, and maintained in place for three months. No aortic insufficiency was created in these first experiments. Two-dimensional color Doppler echocardiography was used to assess the function and safeguarding of the aortic valve. Blood samples were withdrawn to assess hemolysis, and histopathologic examinations performed at necropsy.
Direct implantation of the three permanent magnets was possible in all seven animals, but the surgical procedure resulted in major complications in three cases. Only five animals could be weaned from CPB, and only four survived the procedure at three months. One magnet was also shown to have migrated postoperatively. Echocardiography confirmed the stability of the aortic leaflet contours. The biocompatibility of the implanted magnets (i.e., absence of hemolytic reaction) was found to be satisfactory, without a need for postoperative anticoagulation.
The use of magnetic force to correct valvular insufficiency has not previously been reported, and is an interesting field of investigation. Whilst these experiments are at an early stage of development, future changes in magnet design and surgical approach are indicated.
The Journal of heart valve disease 01/2011; 20(1):70-4. · 0.75 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Quadrangular resection is the gold standard in the treatment of posterior leaflet prolapse. Anterior leaflet prolapse has been considered a more challenging problem; several techniques are available to treat it, all with the same goal - mitral valve competency. Nowadays, good long-term results are reported, similar to those for posterior leaflet prolapse. Certain improvements may explain these results, especially improvements in transesophageal echocardiography (including three-dimensional echocardiography), which allow the detection of atypical mitral regurgitation and its mechanism.
[Show abstract][Hide abstract] ABSTRACT: En attente de greffe, l’utilisation de l’ECMO, sur un patient stabilisé sous ECMO, peut permettre la transplantation avec
des résultats identiques à ceux obtenus dans les autres situations, à condition d’être suffi samment intransigeant sur la
qualité de la stabilisation. L’ECMO est le traitement de référence des formes sévères de défaillance primaire du greffon après
transplantation cardiaque. De plus, la mortalité tardive ne semble pas affectée par la nécessité d’une ECMO post-greffe: après
la première année, les patients supportés avec une ECMO ont la même espérance de vie à trois ans que les autre transplantés.
D’autres études seront nécessaires pour établir le meilleur seuil clinique pour l’implantation de l’assistance et pour montrer
des résultats à plus long terme.
[Show abstract][Hide abstract] ABSTRACT: Early graft failure (EGF) is a major risk for death after heart transplantation. We studied the impact of an extra-corporeal membrane oxygenation (ECMO) temporary support on the operative mortality and the mean-term survival after EGF.
Between January 2000 and December 2006, 394 patients underwent orthotopic heart transplantation at our institution. EGF was observed in 90 (23%) patients. Fifty-four patients (14%) were treated with ECMO support, eight (2%) with other assisting devices, and 28 (7%) received maximal inotropic drug support only.
The overall mortality was 21% (83 patients). EGF was a major risk for death: 13% (35 patients) without EGF versus 58% (49 patients) with EGF, p<0001. Among patients supported with ECMO, 36 (67%) were weaned from the assisting device and 27 (50%) were discharged from the hospital. Overall survival was 73% at 1 year and 66% at 5 years. Absence of EGF improved long-term survival: 78% at 1 year and 70% at 5 years without EGF versus 37% at 1 year and 35% at 5 years with EGF. Patients treated with ECMO have the same 1-year conditional survival as patients not having suffered EGF: 94% at 3 years.
ECMO support is a reliable therapeutic option in severe EGF after cardiac transplantation; furthermore, patients treated with ECMO have the same 1-year conditional survival as patients not having suffered EGF.
European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 08/2009; 37(2):343-9. DOI:10.1016/j.ejcts.2009.05.034 · 3.30 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Aortic valve replacement (AVR) in patients who have undergone previous coronary artery bypass grafting (CABG) is a challenging redo surgery. We undertook this study to evaluate the early and late outcomes of patients operated upon using a simplified surgical approach. Between January 2001 and December 2005, 2238 patients underwent AVR in our institution. We reviewed retrospectively the 57 patients who had AVR following previous CABG. All patients underwent cardiopulmonary bypass with a mild-to-moderate systemic hypothermia (mean temperature: 29.7 +/- 2.5 degrees C). Patent internal thoracic artery (IMA) grafts were never dissected, controlled or clamped. A mechanical or biological prosthesis was implanted considering the patient's age. The mean cardiopulmonary bypass (CPB) time was 93 +/- 29 min (median: 80 min, range: 43-244 min) and the mean aortic cross-clamp (AoX) time was 63 +/- 18 min (median: 59 min, range: 31-125 min). The early mortality was 10.5% and the late mortality was 9.8% (mean follow-up time: 38 months). The survival was 81% at 5 years and the freedom from major cardiac events was 77%. In conclusion, from our experience, the operating quickness and a simplified approach ('open IMA technique', anterograde cardioplegia, mild-to-moderate hypothermia and minimal dissection of the mediastinal structures) represent two fundamental choices to perform this type of surgery easily, safely and with optimal results.
European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 07/2009; 36(2):404-6. DOI:10.1016/j.ejcts.2009.04.019 · 3.30 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Naturally occurring clefts in the posterior leaflet of the mitral valve and/or the mitral commissures themselves may become the foci of residual mitral regurgitation when distorted by an adjacent rigid suture line. Herein are reported the details of three cases in which cleft/commissure closure resolved such leaks. The anatomical substrate which predisposed to this problem is also discussed.
The Journal of heart valve disease 06/2009; 18(3):290-1. · 0.75 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Biventricular assist device support with a paracorporeal pulsatile device is known to be an efficient bridge to recovery for patients with fulminant myocarditis-related cardiogenic shock. Whether these patients can be as efficiently supported with femorofemoral extracorporeal membrane oxygenation remains unclear.
From 2001 to 2006, 11 patients were referred to our cardiac surgery department for fulminant myocarditis-related cardiogenic shock. The first 5 patients (mean age, 32 +/- 2 years) were supported with a biventricular assist device (Thoratec, Pleasanton, Calif; group I), whereas the remaining patients (40 +/- 4 years) were supported with femorofemoral extracorporeal membrane oxygenation (group II). Preimplantation probability of death was calculated by using the APACHE II score, which was 11 +/- 9 in group I versus 24 +/- 18 in group II.
One patient in each group died while receiving support. In group I the death occurred after 18 days of support in a patient who had 45 minutes of external resuscitation before biventricular assist device implantation. In group II a patient who remained unstable during extracorporeal membrane oxygenation was switched to a biventricular assist device 13 days later and eventually died of tamponade after 45 days. All other patients were weaned from the device after a mean duration of support of 21 +/- 5 days in group I versus 13 +/- 4 days in group II. At hospital discharge, the mean ejection fraction was 45% +/- 5% in both groups, and at 6 months' follow-up, it was 65% and 75%, respectively, in groups I and II.
In our experience extracorporeal membrane oxygenation is as efficient as use of a biventricular assist device as a bridge to recovery for patients with fulminant myocarditis-related cardiogenic shock and facilitates renal and hepatic recovery on support.
The Journal of thoracic and cardiovascular surgery 02/2009; 137(1):194-7. DOI:10.1016/j.jtcvs.2008.09.051 · 4.17 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Using echocardiography, perioperative assessment of systolic function by fractional area change (FAC) is questionable in patients suffering from mitral regurgitation (MR). Tei index, an index expressing global cardiac function, has been reported to be unchanged after mitral valve surgery. We tested the hypothesis where the Tei index could be useful in assessing the perioperative cardiac function in patients undergoing mitral valve repair (MVR).
Twenty-five patients were enrolled. Transoesophageal echocardiography was performed perioperatively before and after the correction of MR. We compared the impact of the MVR on the left ventricular FAC and the Tei index. FAC was calculated from the transgastric short-axis view and Tei index was determined from the four chambers and deep transgastric views.
Two patients were excluded because of poor acoustic windows. FAC significantly decreased after MVR from 53 (9)% to 42 (10)% (P<0.001), while Tei index was unaffected [0.46 (0.16) vs 0.47 (0.17), NS]. A significant relationship was found between the preoperative Tei index and the postoperative FAC (R=-0.64, P<0.001). Moreover, a significant and clinically relevant relationship was determined between the predicted (using preoperative Tei index) and the measured postoperative FAC (R=0.64, P<0.001).
FAC but not the Tei index is influenced by MVR. The preoperative determination of the Tei index allows predicting postoperative FAC and offers the opportunity to identify patients in whom a severe unsuspected systolic dysfunction could render difficult the weaning from cardiopulmonary bypass.
BJA British Journal of Anaesthesia 10/2008; 101(4):479-85. DOI:10.1093/bja/aen212 · 4.85 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Iatrogenic injury to the circumflex coronary artery following mitral annuloplasty is a potentially fatal complication. It can be clinically silent or else be responsible for a cardiogenic shock. The diagnosis should be suspected on EKG changes with segmental dysfunction of the lateral wall on the intraoperative echography. The author reports one case whose recognition relied on emergency angiography; the patient was successfully treated by angioplasty and stenting. The management of this complication remains controversial and the various treatment modalities are discussed.
European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 09/2008; 34(4):922-4. DOI:10.1016/j.ejcts.2008.07.016 · 3.30 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The number of heart transplants in France has begun to increase again in the past few years, albeit slowly. Indications for transplants must be discussed on a case-by-case basis and no contraindication should be considered absolute. Heart transplant results have not been modified by the expansion of the selection criteria for donors. The "super-urgent" list makes it possible to provide transplants for the patients at highest risk of imminent death, with encouraging results. The repercussions of "super-urgent" transplants must be analyzed regularly. Quality of life must be taken into account in the analysis of heart transplant results, just like survival. New circulatory assist devices can be offered to some patients as an alternative to transplantation.
[Show abstract][Hide abstract] ABSTRACT: A 50-year-old female operated of Bentall five years before was referred to our hospital for an aneurysm of both right subclavian artery and brachiocephalic trunk associated with a false anastomotic aneurysm on the insertion of the left coronary artery. The procedure was performed under moderate hypothermic circulatory arrest; the false aneurysm was repaired, the brachiocephalic trunk and the subclavian aneurysm were resected, an aorto-carotid and axillary bypass were finally performed. The postoperative course was uneventful. She was discharged to home on postoperative day 7. At six-month follow-up, she was still asymptomatic.
Journal of Cardiac Surgery 04/2008; 23(5):513-4. DOI:10.1111/j.1540-8191.2007.00550.x · 0.89 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Optimal treatment of type B dissections is open to debate. The use of endoprostheses is an option that requires evaluation.
To report our experience with endoprostheses in type B aortic dissections.
We report our short- and medium-term results with covered prostheses for the treatment of acute (n=7) and chronic (n=28) type B aortic dissections. The criteria used to indicate treatment were the same as those usually used for surgery: acute complications or dilated aneurysm. Cover of the main intimal tear was obtained in all cases with an improvement in symptoms in patients with acute dissections.
Early mortality was 14.3% (five patients), linked in three cases to the occurrence of a retrograde dissection of the ascending aorta. No neurological complications were observed. Four patients required an additional endovascular and/or surgical procedure. On early control scans, complete thrombosis of the false lumen at the thoracic level was observed in 40% of cases, partial thrombosis in 42.8% and an absence of thrombosis in 11.4%. After a mean follow-up of 20.8 months, one patient died of a pneumopathy. No secondary aneurysm expansion was noted at the thoracic stage whereas three patients presented with dilation of the abdominal aorta.
The results of treatment of type B dissections with covered endoprostheses are encouraging. However, the morbimortality associated with treatment and the uncertainty of long-term results do not allow the use of this therapeutic option outside the criteria usually recognized to indicate surgery.
[Show abstract][Hide abstract] ABSTRACT: We present a rare case of bullet embolism from the left brachiocephalic vein to the right ventricle, following a chest gunshot wound, in a 56-year-old soldier. The bullet was accidentally discovered on a systematic chest X-ray. The bullet was very close to the tricuspid subvalvular apparatus and was about to come out from the ventricle. We removed it under cardiopulmonary bypass.
Journal of Cardiac Surgery 03/2008; 23(2):176-7. DOI:10.1111/j.1540-8191.2007.00515.x · 0.89 Impact Factor