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Atrioventricular dissociation exacerbating posturally-induced syncope.

N Samniah1, S Sakaguchi, D G Benditt

  • 1Division of Cardiology, University of Minnesota, Minneapolis MN 55455, USA.

Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing
|May 9, 2001
PubMed
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An 85-year-old experienced syncope due to an accelerated junctional rhythm causing atrio-ventricular (AV) dissociation. This AV dissociation, not heart rate, was key to developing hypotension and syncope.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Autonomic Nervous System

Background:

  • Neurally-mediated syncope is common, often linked to autonomic dysfunction.
  • Understanding the mechanisms of syncope, particularly hypotension, is crucial for diagnosis and management.

Observation:

  • An 85-year-old patient presented with posturally-induced syncope.
  • Tilt table testing reproduced syncope, revealing an accelerated junctional rhythm with atrio-ventricular (AV) dissociation.

Findings:

  • Electrophysiologic testing confirmed that AV dissociation, not just heart rate, caused symptomatic hypotension.
  • An accelerated junctional rhythm led to hypotension, while a faster atypical AV nodal re-entrant tachycardia (AVNRT) did not, highlighting the role of AV synchrony.

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Implications:

  • Symptomatic hypotension due to AV dissociation may be a distinct manifestation of neurally-mediated syncope.
  • This case underscores the importance of assessing AV synchrony in patients with unexplained syncope and autonomic disturbances.