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Idioventricular rhythm. There are no P waves and a PR interval cannot be ascertained. No waves are discernible between QRS complexes, but the R-R intervals are regular and the QRS complexes are wide. The rhythm is slow and is being paced by tissue in the ventricle. This rhythm differs from ventricular tachycardia (Figure 15) only in the fact that the rate is slow; it could just as well be called ventricular bradycardia.
