Abstract
As the consequence of the investigation of arrhythmia and disturbance of stimulus conduction, it may be concluded as follows.
(1) Although in some cases the operation had to be postponed and N2O anesthesia had to be used instead of ether anesthesia, since ether inhalation might cause the fall of blood pressure and the appearance of ventricular extrasystole or ventricular rhythm, the electrocardiographic changes observed during this series of open heart surgery in hypothermia were reversible and disappeared in short time spontaneously or by the treatment.
(2) The fact that these changes were observed in serious cases above 20 years of age with severely damaged myocardium and marked abnomalities of hemodynamics, suggests that operation should be performed at as young as possible.
