LONG-TERM OBSERVATION OF THE HEMODYNAMICS OF PERCENT VENTRICULAR PACING

Abstract

Hemodynamic observation prior to pacemaker implantation and generator replacement were performed to obtain the details of cardiac function and to adjust the pacing rate in response to the function.
The pacing rate was determined with reference to maximal cardiac output and lowest intracardiac pressure.
To observe the rate-output curve, cardiac output was measured by the thermodilution method and the intracardiac pressure was measured with a catheter to 40 paced patients.
The rate-output curves tended toward a flat tracing and the right atrial pressure and pulmonary arterial end-diastolic pressure did not elavate. During long-term pacing, no congestive heart failure or pulmonary hypertension occured.