A 64-year-old male with bradycardia was diagnosed with SA Wenckebach, a rare arrhythmia mimicking AV block, which was managed by discontinuing nodal blockers without needing a pacemaker.
Case Report (n=1)
Recognizing SA exit block type I is important as it can mimic AV block or sinus arrhythmia, and may be managed conservatively by discontinuing nodal blockers.
INTRODUCTION: Second-degree sinoatrial (SA) exit block type I, or SA Wenckebach, is a rare arrhythmia marked by progressively shortening P-P intervals followed by a dropped P wave and a noncompensatory pause, producing a grouped beating pattern on electrocardiogram (ECG). CASE PRESENTATION: A 64-year-old male with multiple comorbidities presented after a mechanical fall with bradycardia. ECG revealed a new SA exit block type I. Echocardiography showed preserved ejection fraction and grade II diastolic dysfunction. DISCUSSION: Nodal blockers were discontinued, and pacemaker implantation was deemed unnecessary. Recognizing SA exit block is important, as it can mimic atrioventricular block or sinus arrhythmia on ECG.
Alomari et al. (Tue,) conducted a case report in Sinoatrial Wenckebach (Second-degree SA exit block type I) (n=1). Sinoatrial Wenckebach was evaluated. A 64-year-old male with bradycardia was diagnosed with SA Wenckebach, a rare arrhythmia mimicking AV block, which was managed by discontinuing nodal blockers without needing a pacemaker.