Key result
A 64-year-old male was diagnosed with second-degree sinoatrial exit block type I, a benign arrhythmia mimicking AV block, which was managed conservatively by discontinuing nodal blockers.
Why the study?
Recognizing sinoatrial exit block is important because this rare arrhythmia can mimic atrioventricular block or sinus arrhythmia on ECG.
Case Report (n=1)
Second-degree sinoatrial exit block type I is a benign grouped beating pattern that can mimic AV block but does not typically require pacemaker implantation if asymptomatic.
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.
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Alomari et al. (2025) conducted a case report in Second-degree sinoatrial exit block type I (SA Wenckebach) (n=1). Conservative management (discontinuation of nodal blockers) was evaluated. A 64-year-old male was diagnosed with second-degree sinoatrial exit block type I, a benign arrhythmia mimicking AV block, which was managed conservatively by discontinuing nodal blockers.
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