Apparent pacemaker dysfunction during peptide receptor radionuclide therapy for neuroendocrine tumor

Area of Science:

• Cardiology
• Electrophysiology
• Internal Medicine

Background:

• Pacemaker function is critical for managing cardiac arrhythmias.
• Electrolyte imbalances are common but can present with varied clinical manifestations.

Observation:

• A patient experienced unexplained changes in pacemaker pacing thresholds.
• These threshold variations were initially attributed to device malfunction.

Findings:

• The investigation revealed a rare electrolyte imbalance as the underlying cause.
• Correction of the electrolyte abnormality led to normalization of pacemaker pacing thresholds.

Implications:

• Highlights the importance of considering rare electrolyte disturbances in pacemaker management.
• Emphasizes the need for comprehensive diagnostic evaluation beyond device checks.
• Suggests that reversible pacing issues can stem from metabolic derangements.