Sleep-Associated Torsades de Pointes: A Case Report

Area of Science:

• Cardiology
• Clinical Electrophysiology
• Pharmacology

Background:

• Torsades de Pointes (TdP) is a life-threatening ventricular arrhythmia associated with Long QT Syndrome (LQTS).
• Acquired LQTS can result from various factors, including medications and electrolyte imbalances, particularly in patients with chronic conditions.

Observation:

• A 57-year-old male with end-stage renal disease on methadone maintenance therapy presented with recurrent TdP episodes during sleep.
• Electrocardiogram revealed a significantly prolonged QTc interval (548 milliseconds), indicative of QT prolongation.

Findings:

• The patient's TdP was successfully managed by discontinuing methadone and initiating isoproterenol infusion.
• A multifactorial acquired LQTS, exacerbated by somnolence, was identified as the likely cause of the TdP episodes.

Implications:

• This case underscores the critical need to monitor QTc intervals in patients with risk factors for acquired LQTS, especially those on methadone.
• Management strategies involving medication adjustment and targeted therapies like isoproterenol can effectively treat TdP in susceptible individuals.
• Understanding the interplay of renal disease, methadone, and QT prolongation is crucial for preventing TdP in complex patient populations.