“Invisible” Pseudo‐Pseudofusion Beats

AGUSTIN CASTELLANOS, LIAQAT ZAMAN, ROBERT J. MYERBURG

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Three simultaneous leads (I, II and VI) were recorded in a patient with a normally functioning bipolar AV sequential (DVI) pacemaker. Superimposition of the ineffectual atrial spikes upon the early part of the QRS complexes resulted in pseudo‐pseudofusion beats, clearly identified in lead II, However, the small spikes were hardly seen in lead I and not seen at all in lead VI. Therefore, the pseudo‐pseudofusion beats were “almost invisible” and “invisible,” respectively, in these leads. Delivery of atrial spikes within the beginning of the QRS complexes was possible because sensing of the ventricular electrogram occurred after the onset of ventricular depolarization in the surface leads. (PACE, Vol. 5. March‐April, 1982)

Original languageEnglish (US)
Pages (from-to)260-263
Number of pages4
JournalPacing and Clinical Electrophysiology
Volume5
Issue number2
DOIs
StatePublished - Mar 1982

Keywords

  • AV sequential pacing
  • DVI pacemakers
  • fusion beats
  • pseudofusion beats
  • pseudo‐pseudofusion beats

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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