Applications of the catheter-tip electromagnetic velocity probe in the study of the central circulation in man.

Phasic and mean blood flow velocities and pressures were continuously recorded within the venae cavae, pulmonary artery and ascending aorta with a catheter-tip electromagnetic velocity probe in twenty-three conscious patients. During the Valsalva maneuver, following the initial rise in the aorta, blood flow velocity diminished and, after release, increased above normal in all great vessels. In atrial fibrillation, peak aortic and pulmonary arterial velocities varied directly with the length of the preceding cardiac cycle and ventricular end-diastolic pressure. Peak aortic velocity rose markedly following premature ventricular contraction. Leg exercise, isoproterenol and glucagon caused striking elevations of aortic and pulmonary arterial velocities. Thus, this flowmeter catheter allows accurate, rapid and safe measurement of instantaneous linear blood flow and pressures in great vessels of intact patients in the assessment of cardiovascular function.

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