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[Coronary disease in patient following heart transplantation]
C Benvenuti1, A Nitenberg, E Aptecar
1Service de chirurgie cardiaque, hôpital Henri Mondor, Créteil.
Insights
Coronary artery disease is a severe complication after cardiac transplantation, often silent due to denervation. Early diagnosis and understanding its multifactorial causes are crucial for managing graft dysfunction and improving patient outcomes.
Area of Science:
- Cardiology
- Transplantation Medicine
- Vascular Biology
Background:
- Coronary artery disease (CAD) is a severe complication following cardiac transplantation, leading to graft destruction via ischemia.
- Cardiac denervation often renders CAD asymptomatic, with cardiac failure, infarction, or sudden death as sole indicators.
- Prevalence of coronary lesions reaches 25% at 2 years and 50% at 5 years post-transplant.
Purpose of the Study:
- To review the characteristics, diagnosis, pathogenesis, and management of coronary artery disease in cardiac transplant recipients.
- To highlight the challenges in diagnosing and preventing this complication.
Main Methods:
- Review of literature on coronary artery disease in cardiac transplant recipients.
- Analysis of epidemiological data, lesion morphology, and histological features.
- Discussion of diagnostic challenges and potential pathogenetic factors.
Main Results:
- Coronary lesions are diffuse, concentric, occlusive, and predominantly distal, lacking collateral circulation.
- Histology may show medial necrosis, endothelial damage, and inflammation, suggestive of arteriolitis, often linked to rejection.
- No non-invasive diagnostic method is sufficiently sensitive, leading to routine annual coronary angiography in many centers.
Conclusions:
- The pathogenesis of transplant-associated CAD is multifactorial, involving lipid metabolism, immunology, and Cytomegalovirus infection.
- Lack of identifiable risk factors complicates prevention strategies.
- Retransplantation is considered for selected patients to mitigate acute coronary events and sudden death risk.
Abstract:
Coronary artery disease is a common and particularly severe complication of cardiac transplantation because it may cause progressive destruction of the graft by acute or chronic ischemia. The ischemia is usually silent because of cardiac denervation. Cardiac failure related to graft dysfunction, asymptomatic infarction on the ECG, or sudden death, are sometimes the only signs of severe coronary disease. The prevalence of coronary lesions has been evaluated by coronary angiography at nearly 25% at 2 years and 50% at 5 years. The distribution and morphology of the lesions are characteristic: diffuse concentric, irregular and occlusive, predominantly distal stenoses, without a distal and usually without a collateral circulation. The histological features are variable: the association of medial necrosis, severe endothelial lesions and intense parietal inflammation are suggestive of acute arteriolitis, often present during acute rejection, may be related to a common pathological process. Diffuse obliterative arteriolar lesions with concentric proliferation of medial smooth muscle are the usual appearances in transplant patients who have died or been retransplanted. There is no non-invasive diagnostic method sufficiently sensitive of specific which justifies the practice of many groups of systematic annual coronary angiography in transplanted patients. The pathogenesis is poorly understood and probably multifactorial: disorders of lipid metabolism, immunological factors, the atherogenic role of Cytomegalovirus infection. The absence of an identifiable risk factor makes preventive measures difficult. The evolutive risk justifies retransplantation in selected patients, the results of which are less satisfactory but which reduces the risk of acute coronary events and sudden death.(ABSTRACT TRUNCATED AT 250 WORDS)