Electrocardiographic studies in the stumptail macaque (Macaca arctoides)

Summary Our study has defined normal electrocardiographic standards for Macaca arctoides . It appears that certain species differences exist in the electrocardiogram (ECG) in monkeys and that different criteria for normality may be necessary. Thus, in apparently normal Macaca arctoides a high frequency of Q waves and ST segment elevations of the J point type are present compared to Macaca mulatta . It is suggested that normal ECG criteria be established for each species of monkeys to allow accurate interpretation.