R WAVES INTERRUPTING T WAVES

Abstract

AIn the middle of the paroxysm the individual com- plexes differ in duration and this seems to depend chiefly on the point at which the T-like terminal Flo. 2.-Case 2. The trace shows a paroxysm of ventricular tachycardia.This complex at the end of the paroxysm and the complexes at the extreme left and right of the trace are uninterrupted.The arrows mark the points where complexes are interrupted during the paroxysm.Comparison with intact complexes indicates how much of the interrupted complexes have been cut off by the beginnings of new ventricular complexes.Time intervals 005 sec. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~7Ro. 3.-Case 3. Lead I shows the end of a period of rapid beating with the return of sinus rhythm, lead II shows an end of rapid beating and lead III the beginning of rapid beating with polymorphic ventricular complexes of supraventricular origin.The irregular arrhythmia has been calle4 paroxysmal auricular fibrillation.CF4 shows two interruptions by R waves of the antecedent T waves.Time intervals 0-05 sec.25-