Intermittent complete atrioventricular block associated with typical atrioventricular nodal reentrant tachycardia

摘要

A 30 year old woman with a three year history of intermittent palpitations presented to the emergency department following a typical epi- sode. She was known to have β thalassaemia minor and took no regular medication. A 12 lead ECG on presentation demonstrated sinus rhythm with a PR interval of 112 ms but with- out evidence of ventricular pre-excitation. During examination, syncope occurred and Transient asystole was observed on a bedside Monitor.