The study of electrocardiograms has advanced to a conspicuous degree the recognition of lesions of the heart. At the present time the interpretation of abnormal ventricular complexes is receiving considerable attention, and any observations which may bear on this question give sufficient excuse for their being recorded.
The normal ventricular complex has certain definite characteristics which, on the whole, fall within narrow limits. The main points, in which deviation from the normal may occur, are in the time occupied by the various parts of the ventricular complex and in the form of the deflections constituting this complex. For the sake of convenience the ventricular complex may be divided into two main segments, namely, the Q-R-S period and the S-T period. The Q-R-S period includes the primary deflections starting at the beginning of Q and finishing at the end of S. The S-T period commences at the end of S and
MEAKINS J. PROLONGATION OF THE "S-T" INTERVAL OF THE VENTRICULAR COMPLEX AS SHOWN BY THE ELECTROCARDIOGRAPH. Arch Intern Med (Chic). 1919;24(5):489–496. doi:10.1001/archinte.1919.00090280020002
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