Abstract
Three cases of intermittent incomplete bundle-branch block are presented with clinical notes and a discussion of the electrocardiograms. Certain features in these three cases warrant further emphasis. In all instances there was evidence of myocardial disease without endocardial valvular involvement. Cardiac enlargement was not marked in any case and slight dependent edema occurred in only one instance. Acute cardiac decompensation was present in two cases as evidenced by pulmonary edema, while in the other case no clinical decompensation occurred. These cases demonstrate that apparent profound disturbances in ventricular conduction may be evanescent, with or without cardiac decompensation. It is important to emphasize further that the electrocardiograph may be the first and only means of detecting serious myocardial changes, as is illustrated in Case 1.
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