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Risk factors for development of accelerated coronary artery disease in cardiac transplant recipients
B Radovancevic1, S Poindexter, S Birovljev
1Cullen Cardiovascular Surgical Research Laboratory, Texas Heart Institute, Houston.
Insights
Allograft coronary artery disease (CAD) after heart transplantation is linked to rejection episodes and hypertension. Managing rejection, hypertension, and smoking may reduce CAD risk in heart transplant recipients.
Area of Science:
- Cardiology
- Transplantation Immunology
Background:
- Allograft coronary artery disease (CAD) significantly impacts long-term survival after heart transplantation (HTx).
- Understanding risk factors for CAD post-HTx is crucial for improving patient outcomes.
Purpose of the Study:
- To identify immunological and non-immunological risk factors associated with the development of CAD in heart transplant recipients.
Main Methods:
- Retrospective analysis of 210 heart transplant recipients.
- Evaluation of rejection patterns, immunosuppressive therapy, CMV infection, hyperlipidemia, smoking, hypertension, diabetes mellitus, and obesity.
- Correlation of risk factors with CAD diagnosis via coronary angiography, postmortem, or retransplantation examination.
Main Results:
- CAD was diagnosed in 27.1% of recipients.
- Increased rejection episodes (two or more) correlated with higher CAD incidence (40% vs. 23%).
- Postoperative hypertension (92.6% in CAD group) and smoking significantly correlated with CAD development.
Conclusions:
- Treated allograft rejection is a significant factor in CAD development post-heart transplantation.
- Aggressive management of hypertension and smoking cessation are recommended to mitigate CAD risk.
Abstract:
Allograft coronary artery disease (CAD) is the major determinant of long-term survival following heart transplantation (HTx). In a group of 210 heart transplant recipients, we diagnosed CAD in 54 (27.1%) by coronary angiography, postmortem examination or examination of the transplanted heart at the time of retransplantation. Retrospective analysis of potential risk factors for the development of CAD was performed for both immunological (rejection pattern, immunosuppressive therapy, cytomegalovirus [CMV] infection), and nonimmunological (hyperlipidemia, smoking, hypertension, diabetes mellitus, obesity) risk factors. The total number of rejection episodes correlated significantly with the occurrence of CAD (P less than 0.05), showing that patients who experienced two or more rejection episodes had an incidence of CAD of 40%, as opposed to a 23% incidence in patients who experienced no rejection. A composite rejection score derived from multivariate regression analysis of the severity, frequency, and timing of acute cardiac rejection episodes was found to correlate with the development of CAD (P less than 0.05). Postoperative arterial hypertension also correlated significantly with the onset of CAD (P less than 0.01), with a 92.6% incidence of hypertension in the group with CAD versus 76.3% in the group without CAD. Smoking after transplantation correlated significantly with the occurrence of CAD (P less than 0.05). There was no significant correlation with other analyzed factors in this group of patients. In this review, the development of CAD after heart transplantation correlated with treated allograft rejection. Aggressive treatment of hypertension and cessation of smoking may contribute to alleviation of this serious complication.