Abstract
The influence of atrial fibrillation on phasic aortic and coronary flow velocity, using a Doppler catheter-flowmeter system, was studied in sixteen patients with atrial fibrillation. The peak aortic flow velocity was measured in twelve patients. Despite wide variation in the absolute values for peak aortic flow velocity from patient to patient, a relative linear correlation between peak aortic flow velocity and the preceding cycle length was found in each patient. Various degrees of ventricular aberrations were found in one patient; however, there was no significant difference in peak aortic flow velocity in these beats as compared with other beats with “normal” conduction. There was no correlation between the peak left coronary artery flow velocity and the preceding cycle length; in addition, there was no relation between the peak coronary flow velocity and the same cycle length. However, since the total coronary flow is a function of diastolic cycle length, the beats which are followed by a short diastole have a diminished coronary flow.
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