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Significance of pericardial effusion after heart transplantation.

The aim of this study was to evaluate the clinical significance of pericardial effusion after heart transplantation and to assess its correlation with acute rejection. One hundred fifty transplanted patients were followed up for the first year: serial echocardiographic studies were performed on the same day as were the endomyocardial biopsies; hemodynamic studies and coronary angiographies were performed 1 year after transplant. Ten days after surgery, pericardial effusion was absent in 77 patients, small in 52, moderate in 14, and large in 7, and was significantly related to severe postoperative bleeding (p < 0.001). Patients were classified according to the presence and the course of pericardial effusion in group A (absence or disappearance of previous pericardial effusion within 1 month, 107 patients) and in group B (onset, persistence, or increase in pericardial effusion, 43 patients). One hundred nineteen patients experienced > or = 1 acute rejection episode. The evolution of pericardial effusion was different (p < 0.0001) according to the number of acute rejection episodes and biopsy specimens showing acute rejection, histologic grading and time of the first episode, and histologic grading of the most severe acute rejection episode. Furthermore, there was a significant correlation with the cumulative duration of acute rejection episodes (p < 0.005) and the presence of previous cardiac surgical history (p < 0.007), but no correlation with cardiac transplant vasculopathy or with a positive weight mismatch. This study suggests that pericardial effusion in transplant recipients is associated with a higher incidence and more severe histologic grading of acute rejection episodes; its presence indicates the need for stricter monitoring of acute rejection.

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