Abstract
Since Cabrera and Monroy described that the systolic (pressure) and diastolic (volume) overloading of both ventricles are well reflected in the electrocardiogram in 1952, many reports on this subject have been presented.
It is generally accepted that the abnormal Q wave accompanied with high R and T waves on the chest lead (V5·V6), shows left ventricular volume overload.
In the case of M. I., hemodynamic feature shows left ventricular volume overload, on the other hand, in M. S. it should be considered to show the left ventricular hypo-volume loading. Therefore, Q wave of the left chest lead is lowered or disappeared in the severe M. S., and it increased in height when complicated with M. I.,
The relation between Q wave and M. S. was discussed in this paper, reviewing 15 cases with M. S., 3 with M. S. I., 6 with M. I. and other control group, which include 13 cases of L. U. L., 16 of L. O. L. and normal 15 cases.
As shown in the table, Q wave of left chest lead was well correlated with the left hemodynamic differences, especially in the case of M.S. and M.I.. Consequently it was very important to decide the grade in M.S., and to obtain successful result of commissurotomy and to differentiate complicated valve diseases.
