Time course of electrocardiographic changes in transient left ventricular ballooning syndrome.

Background: We sought to describe, for the first time, in detail the time course of electrocardiographic (ECG) changes in transient left ventricular ballooning syndrome (TLVBS) from acute onset until 1 year after presentation.

Methods: The serial ECGs of all patients identified with TLVBS who presented to our cardiology department from August 1998 to August 2012 were analyzed, from admission to 1-year follow-up, with respect to time from onset of symptoms.

Results: In total, 145 TLVBS episodes were identified in 139 patients. In 53% of patients, ST segment elevation was present in the first 3h after symptom onset, after which there was a steady decline with complete resolution in all patients by 1 month. The presence of T wave inversion (TWI), with or without ST segment depression, was most prevalent between day 1 (60%) and day 30 (71%) from symptom onset, with 17% of patients still exhibiting TWI after 6 to 12 months. At 1 year, approximately 80% of patients had no significant residual ST-T wave changes. In 86% of patients, there was prolongation of the corrected QT (QTc) interval in the acute phase, with normalization of all QTc intervals by day 14.

Conclusions: During the early phase, ECG mimics acute ST elevation myocardial infarction with initial regional ST segment elevation progressing to T wave inversion with or without ST depression. In the majority of patients, significant QTc interval prolongation occurs in the early phase, normalizing by day 14.