THE NORMAL DURATION OF THE ELECTROCARDIOGRAPHIC VENTRICULAR COMPLEX

Abstract

The most accurate formulas for the prediction of the duration of the electro-cardiographic ventricular complex (Q-T time) from measurements of pulse interval in a series of 50 normal [male][male] are: Q-T=.1536 R-R + .2462, and for 54 normal [female][female], Q-T = .1259 R-R+.2789 in which Q-T=duration of electrocardiographic systole, and R-R=pulse interval. The use of age, ht., and wt. of the individual, and axis and T-wave height of the electrocardiogram does not appreciably increase the accuracy of prediction of the duration of the electrocardiographic ventricular complex. Other workers have found the duration of the electrocardiographic ventricular complex to be shorter for corresponding pulse rates. The reason for this difference is not apparent.