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Ann Thorac Surg 1989;48:518-522
© 1989 The Society of Thoracic Surgeons

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Articles

Coronary Flow Velocity Waveforms in Aortic Stenosis and the Effects of Valve Replacement

Departments of Thoracic Surgery and Medical Engineering, Kawasaki Medical School, Kurashiki, Japan

Accepted for publication June 13, 1989.

^* Address reprint requests to Dr Fujiwara, Department of Thoracic Surgery, Kawasaki Medical School, 577 Matsushima, Kurashiki 701-01, Japan

In 6 patients with pure aortic stenosis, the flow velocity waveforms in the left anterior descending coronary artery were studied using an 80-channel 20-MHz pulsed Doppler velocimeter before and immediately after aortic valve replacement. All patients showed normal coronary arteriograms. The left anterior descending coronary artery flow velocity waveform in aortic stenosis was characterized by a reverse flow in the first half of systole and a slowly increasing diastolic inflow. After aortic valve replacement, the reverse flow in the first half of systole disappeared in all patients, but an end-systolic reverse flow was discerned in 5 of 6 patients. The increasing rate of the diastolic inflow was augmented in all patients. After aortic valve replacement, the time from onset of diastole to the diastolic peak velocity was shortened from 176.8 ± 28.8 to 90.5 ± 18.8 ms (p < 0.01), and the diastolic peak velocity increased from 90.5 ± 28.0 to 122.5 ± 17.2 cm/s (p < 0.05). Blood pressure and heart rate, however, did not change significantly before and after valve replacement. These changes in the left coronary artery velocity waveforms after valve replacement suggest the beneficial effects of removal of aortic stenosis on human coronary artery inflow.

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