Does intravenous verapamil cause cycle length alternation in patients with supraventricular tachycardia?
Intravenous verapamil administration for supraventricular tachycardia can be associated with RR cycle length alternation and changing QRS morphology prior to reversion to sinus rhythm.
Four patients are reported in whom alternation of RR cycle length before reversion to sinus rhythm occurred during the administration of intravenous verapamil. In 2 of these 4 patients, alternation of cycle lengths was associated with a changing QRS morphology.
Vohra et al. (Sat,) studied this question.
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