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Dilated angiopathy: a specific subtype of allograft coronary artery disease
1Medizinische Klinik I, Klinikum Grosshadern, University of Munich, Federal Republic of Germany.
Insights
Dilated coronary angiopathy, a new subtype of vascular injury, was found in heart transplant recipients. This condition, characterized by vessel dilation and contrast stasis, may pose a risk for embolic myocardial ischemia.
Area of Science:
- Cardiology
- Transplantation Immunology
- Vascular Biology
Background:
- Heart transplantation is a life-saving procedure for end-stage heart failure.
- Allograft coronary artery disease (ACAD) is a major cause of long-term graft failure.
- Existing ACAD subtypes include intimal hyperplasia and fibromuscular dysplasia.
Purpose of the Study:
- To describe a previously unrecognized form of coronary angiopathy in heart transplant recipients.
- To characterize the angiographic features and clinical associations of this novel condition.
- To differentiate it from other known forms of ACAD.
Main Methods:
- Coronary angiography was performed on 68 heart transplant recipients >= 1 year post-transplant.
- Dilated coronary angiopathy was defined as a >50% increase in diameter compared to adjacent segments.
- Clinical data, including donor factors, rejection history, and immunosuppression, were analyzed.
Main Results:
- Five of 68 recipients (7.4%) exhibited dilated coronary angiopathy.
- This was characterized by significant vessel dilation and severely delayed contrast medium washout (stasis).
- Dilated angiopathy was distinct from tubular narrowing or eccentric lesions and generally occurred with normal hemodynamics and no ischemic signs.
Conclusions:
- Dilated coronary angiopathy represents a specific, immune-mediated subtype of chronic vascular injury in heart allografts.
- Its pathogenesis remains unknown.
- While potentially having a better prognosis than other ACAD types, it may carry a risk of embolic myocardial ischemia.
Abstract:
Dilated coronary angiopathy exceeding the diameter of adjacent vessel segments by at least 50% was found in five of 68 heart transplant recipients undergoing coronary angiography greater than or equal to 1 year after heart transplantation. Severely delayed washout of the contrast medium from the dilated segments indicated local stasis. Dilated angiopathy was not combined with tubular narrowing of distal vessel segments or with focal eccentric lesions of the same artery. On the average, hemodynamic data were normal except in one patient. Signs of myocardial ischemia were not present on ECG and treadmill exercise testing. Age of the donor heart, ischemia time of the graft, prevalence of myocardial rejection episodes, cyclosporine dosage, and cholesterol serum levels did not differ from the whole group. We conclude that dilated angiopathy of the allograft is a specific subtype of the immune-mediated chronic vascular injury after heart transplantation that has not been described. The pathogenetic mechanisms for these findings are unknown. Although prognosis seems to be better in comparison with the other subtypes of allograft coronary artery disease, the patients may be at risk of embolic myocardial ischemia with progression of the disease.