His bundle electrocardiography during bidirectional tachycardia

S. N. Morris, D. P. Zipes

Research output: Contribution to journalArticle

30 Scopus citations


His bundle electrocardiography in a patient with a digitalis induced bidirectional tachycardia revealed absence of His spike preceding earliest onset of ventricular activation during the bidirectional tachycardia. However, His potential preceded ventricular activation of normal complexes at a constant H V interval of 35 msec. The presence of fusion QRS complexes, capture QRS complexes, the analysis of of cycle lengths, and response to carotid sinus massage all favor a ventricular origin for this tachycardia in the patient presented.

Original languageEnglish (US)
Pages (from-to)32-36
Number of pages5
Issue number1
StatePublished - Jan 1 1973

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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