Abstract
The left ventricular myocardial blood flow of atrial pacing was compared to those of ventricular pacing in twenty rabbits with sinus arrest.
The regional myocardial blood flow was measured by hydrogen gas clearance method.
The distribution of myocardial blood flow during atrial pacing and ventricular pacing was demonstrated unequivocAlly and it was concluded that atrial pacing resulted in larger myocardial blood flow than ventricular pacing at the areas of apex, left circumflex coronary artery, left anterior descending coronary artery and interventricular septum. Furthermore, the following results was obtained. (MBF of ventricular pacing)=(MBF of atrial pacing) x 0.772-0.797
