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Related Experiment Videos

Complete atrioventricular block with unwidened QRS complex during hyperkalemia

G Tiberti1, G Bana, M Bossi

  • 1Division of Cardiology, General Hospital, Lecco, Italy.

Pacing and Clinical Electrophysiology : PACE
|July 22, 1998
PubMed
Summary

Severe hyperkalemia can cause complete atrioventricular (AV) block, even without QRS widening. This case highlights the importance of recognizing hyperkalemia as a cause of AV block and the efficacy of temporary pacing.

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Area of Science:

  • Cardiology
  • Nephrology
  • Electrophysiology

Background:

  • Hyperkalemia is a known cause of cardiac arrhythmias.
  • Purkinje and ventricular fibers are typically more sensitive to hyperkalemia than the sinoatrial (SA) and atrioventricular (AV) nodes.

Observation:

  • A patient with renal failure presented with complete AV block.
  • The AV block occurred without significant QRS complex prolongation.

Findings:

  • The patient's complete AV block was directly attributed to severe hyperkalemia.
  • Temporary endoventricular pacing successfully restored AV conduction.

Implications:

  • Hyperkalemia should be considered in the differential diagnosis of AV block, particularly in patients with renal failure.

Related Experiment Videos

  • Temporary pacing can be a crucial intervention for managing severe hyperkalemia-induced AV block.
  • Restoration of renal blood flow and potassium excretion normalized AV conduction.