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Aborted sudden cardiac death in two patients with Bartter's/Gitelman's syndromes

R Scognamiglio1, C Negut, L A Calò

  • 1Department of Clinical and Experimental Medicine, Matabolic Cardiology, University of Padova, Italy.

Clinical Nephrology
|March 30, 2007
PubMed

Insights

Sudden cardiac death (SCD) in Bartter/Gitelman syndromes is complex. Beyond hypokalemia, exercise-induced cardiac dysfunction and QTc prolongation are potential triggers, necessitating comprehensive cardiac screening.

Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Bartter syndrome and Gitelman syndrome are genetic disorders affecting ion transport.
  • These conditions are associated with electrolyte imbalances, particularly hypokalemia.
  • Sudden cardiac death (SCD) is a known, albeit rare, complication.

Observation:

  • Two patients with Bartter/Gitelman syndromes experienced aborted SCD.
  • Standard electrophysiologic studies and coronary angiography did not reveal inducible arrhythmias or coronary abnormalities.
  • Echocardiography during exercise showed left ventricular dysfunction and reduced cardiac index.

Findings:

  • Paradoxical QTc prolongation occurred during isometric exercise.
  • Nocturnal vagal stimulation also led to QTc prolongation.
  • Hypokalemia alone may not fully explain SCD risk; other factors are involved.

Implications:

  • Identifies exercise-induced cardiac dysfunction and QTc changes as potential SCD triggers in these syndromes.
  • Highlights the inadequacy of hypokalemia as the sole explanation for life-threatening arrhythmias.
  • Underscores the critical need for systematic cardiac screening and tailored treatment protocols for affected patients.

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