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Systemic embolism: a serious complication after cardiac transplantation avoidable by bicaval technique
1Department of Cardiovascular Surgery, Children's Hospital la Timone, Rue de l'Armée d'Afrique, 13385, Cedex 5, Marseille, France. alberi@free.fr
Summary
Modified bicaval heart transplantation significantly reduces systemic embolism risk compared to the classical technique. This improved method avoids left atrial enlargement, preventing dangerous blood clots and strokes post-surgery.
Area of Science:
- Cardiology
- Surgical Innovation
- Transplantation Medicine
Background:
- Systemic embolism is a severe complication following orthotopic heart transplantation.
- Enlarged left atrium is a suspected source of these embolic events.
- Classical orthotopic transplantation techniques may contribute to left atrial enlargement.
Purpose of the Study:
- To compare the incidence of systemic embolism after classical orthotopic heart transplantation versus a modified bicaval technique.
- To investigate the role of left atrial size and function in post-transplant embolic events.
- To evaluate the efficacy of a modified bicaval technique in mitigating these complications.
Main Methods:
- A comparative study of 72 patients undergoing classical transplantation and 106 patients receiving modified bicaval transplantation (including left atrial reduction).
- Patients received antiplatelet therapy with routine follow-up.
- Neurological evaluation and transesophageal echocardiography were performed upon suspicion of embolism.
- A subset of 60 matched patients (30 per group) underwent comparative transesophageal echocardiography at least 6 months post-transplant.
Main Results:
- The modified bicaval technique showed no instances of systemic embolism (P=0.013).
- Classical transplantation resulted in systemic embolism in 15.3% of patients (11/72), including strokes and ischemic events.
- Transesophageal echocardiography revealed significantly smaller left atria in the modified group (20+/-3 cm²) compared to the classical group (33+/-4 cm², P=0.01).
- Spontaneous echo contrast and atrial thrombosis were significantly reduced in the modified bicaval group (0.5% and 0% respectively) compared to the classical group (56% and 9 patients, P=<0.001).
Conclusions:
- The modified bicaval heart transplantation technique effectively prevents systemic embolism, spontaneous echo contrast, and atrial thrombosis.
- The absence of these complications in the bicaval group supports its use over the classical technique.
- The findings raise questions regarding the necessity of anticoagulation in patients who have undergone classical heart transplantation due to observed atrial thrombosis and spontaneous echo contrast.