Resting Hemodynamics After Total Versus Standard Orthotopic Heart Transplantation

Abstract

Total orthotopic heart transplantation (TOHT) requires longer surgery than Standard orthotopic heart transplantation (SOHT), but offers normal anatomy and synchronous atrial contraction. We endeavored to test whether TOHT improves resting hemodynamics. We analyzed 60 patients with SOHT and 66 with TOHT transplanted between 12/89 and 7/94. Age, preoperative NYHA class, ejection fraction, and donor characteristics were similar. After applying exclusion criteria at 2 weeks postoperatively, 53 SOHT and 58 TOHT patients were accepted for further study. Right-heart hemodynamics were examined at 2 weeks and 6 months posttransplant. Despite a longer ischemic time (161 ± 36 vs. 142 ± 37 min, p = 0.004), cardiac Output and index were higher in the TOHT group at 2 weeks (6.1 ± 1.4 vs. 5.4 ±1.0 L/min, TOHT vs. SOHT, p = 0.01; and 3.3 ± 0.7 vs. 2.9 ± 0.6 L/min/m², p = 0.005) but similar at 6 months (5.9 ± 1.2 vs. 5.6 ± 1.4 L/min; and 3.0 ± 0.6 vs. 2.9 ± 0.7 L/min/m²). Right-atrial pressure was lower with TOHT at both time points (7 ± 4 vs. 9 ± 4 mmHg, p = 0.02; and 5 ± 2 vs. 7 ± 3, p = 0.0006). Wedge pressure was similar at 2 weeks (12 ± 5 vs. 13 ± 5) but lower in the TOHT group at 6 months (11 ± 5 vs. 13 ± 5, p = 0.045). Heart rate (bpm) was higher at both time points with TOHT (84 ± 10 vs. 75 ± 12, p = 0.0003; and 90 ± 12 vs. 82 ± 9, p = 0.0006). Pulmonary vascular resistance was similar at both time points. Despite a longer ischemic time, total orthotopic heart transplantation does not impair postoperative cardiac function. There is an early improvement in cardiac Output, a sustained higher heart rate reflecting preservation of donor sinus node function, and a lower right-atrial pressure.

Key words

Heart transplantation - Hemodynamics - Total orthotopic heart transplantation