Cardiac transplantation. Changing patterns in evaluation and treatment

Area of Science:

• Cardiovascular Surgery
• Immunosuppression
• Transplantation Immunology

Background:

• Early heart transplant series (1977-1985) experienced high rates of serious infectious complications.
• The need for effective immunosuppression to balance graft survival and infection risk was evident.

Purpose of the Study:

• To report experience with 66 heart transplants in 64 patients over an 8-year period.
• To evaluate the impact of a modified immunosuppressive regimen on patient outcomes, particularly infection rates.
• To investigate potential mechanisms of graft adaptation and specific unresponsiveness post-transplant.

Main Methods:

• Retrospective analysis of 66 heart transplant cases performed between 1977 and 1985.
• Comparison of outcomes before and after a change in immunosuppressive protocol in April 1983 (introduction of cyclosporine and low-dose steroids).
• Monitoring included frequent myocardial biopsies and serum cyclosporine level determinations.

Main Results:

• A significant reduction in the frequency and severity of serious infections was observed after the change to cyclosporine and low-dose steroids.
• The modified regimen appeared to improve overall outcomes, although the study was not controlled.

Conclusions:

• Altered immune suppression, specifically the use of cyclosporine and low-dose steroids, is associated with improved outcomes in heart transplantation.
• Patients with successful cardiac grafts may develop specific unresponsiveness, a phenomenon warranting further investigation into its underlying mechanisms.