ELECTROCARDIOGRAPHIC STUDIES IN THE MACACA MULATTA MONKEY *

In attempts a t the experimental production of rheumatic fever in the Macaca mdatta (rhesus) monkey, the electrocardiogram was used as a guide in determining evidence of cardiac tissue alteration. In previous studies on monkeys Lloyd1 and De Waart and Storm2 presented observations on the classic leads; Kuskin and Kigdon3 described one chest lead “corresponding to CF4 in man” in addition to the classic leads. Our pilot experiment on a group of unselected monkeys indicated the need for a more complete study of the electrocardiogram in the normal animal in this species. This report presents the results of a study using the classic leads, the augmented unipofar limb leads, and three chest leads in a group of apparently normal rhesus monkeys.