326 PHYSIOLOGY OF INDUCED HYPOTHERMIA 



generally 2-15 milliseconds shorter than the A.R.P. of that same region for cathodal 

 stimulation. 



At the end of experiments designed for collecting other data on cardiac excita- 

 bility we stop the respiration pump. From these "terminal experiments," we get 

 the impression that if there is a greater time difference between A.R.P. for anodal 

 and cathodal stimulation, the heart will fibrillate more readily during the period of 

 anoxia which results from the stopping of artificial respiration. Experiments to 

 make a more accurate analysis of this point are in progress. The results so far are 

 conflicting. 



REFERENCES 



1. Durrer, D., and van der Tweel, L. H. : Spread of activation in the left ventricular wall of the 



dog. I, American Heart Journal 46:5, 683-691 (November 1953). 



2. Van Dam, R. Th., Durrer, D., van der Tweel, L. H., and Strackee, J. : The excitability for 



cathodal and anodal stimulation of the dog's left ventricle during the cardiac cycle, Pro- 

 ceedings Koninkl. Nederl. Akademie van Wetenschappen, Series C 58: 4 (1955). 



