Pacemaker syndrome in a patient with DDD pacemaker for long QT syndrome

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Long QT syndrome management often involves pacemakers.
• Atrioventricular (AV) sequential pacing is common in DDD pacemakers.
• Pacemaker syndrome can arise from dyssynchrony.

Observation:

• A patient with long QT syndrome experienced pacemaker syndrome symptoms during AV sequential pacing.
• Electrophysiological findings revealed ventriculoatrial (VA) conduction with atrial refractoriness.
• Doppler echocardiography suggested ineffective atrial contraction.

Findings:

• The initial AV delay of 250 msec led to ventriculoatrial (VA) conduction and pacemaker syndrome.
• Reprogramming the AV delay to 200 msec enabled atrial capture and restored AV synchrony.
• Shortening the AV delay effectively resolved pacemaker syndrome symptoms.

Implications:

• Optimizing AV delay programming is crucial for preventing pacemaker syndrome in patients with VA conduction.
• This case highlights the importance of assessing VA conduction in pacemaker patients.
• Fine-tuning pacemaker parameters can significantly improve patient outcomes and device efficacy.