Mechanical adaptation of heart rate change for coronary circulation in patients with and without ventricular hypertrophy.

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To clarify the mechanical adaptation and interference of coronary vessels, we studied hemodynamics of coronary circulation in control and 4 different pacing rates (80, 100, 120, 150/min) in 5 patients with angina pectoris (AP) and in 5 patients with hypertrophic cardiomyopathy (HCM). Coronary sinus flow (CSF) was measured by a Webster's thermodilution catheter, and we applied ascorbic acid-platinum reaction for the mean transit time measurement in left coronary flow (t0-t2). Coronary vascular bed (CVB) was obtained by multiplying CSF and t0-t2. CSF in AP gradually increased from 104±21 ml/min at 72/min to 148±42 ml/min at 120/min, while CSF in HCM changed slightly from 91±25 ml/min at 64/min to 94 ml/min at 120/min. Average t0-t2 in HCM was 6.0±1.6 sec in control which was significantly lower than that in AP (7.8±0.7 sec). Calculated CVB in AP increased at any given heart rate up to 120/min (13.5±2.4, 15.8±1.7, 15.0±4.7, 15.1±4.3 ml), but CVB in HCM decreased from 9.1±2.3 ml at 64/min to 8.1±1.7 ml at 120/min. These data suggest that myocardial compression and suction at different heart rates and with different cardiac muscle structures play an important role for beat adjustment of coronary circulation in cardiac cycle.
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