Value of lead aVR in predicting acute occlusion of proximal left anterior descending coronary artery and in-hospital outcome in ST-elevation myocardial infarction: an electrocardiographic predictor of poor prognosis

Background

We aimed to investigate the value of ST elevation in lead aVR (ST↑aVR) in predicting the left anterior descending coronary artery (LAD) occlusion site proximal to first septal perforator (S₁) and its effect on in-hospital outcome in ST-elevation myocardial infarction (STEMI).

Methods

The study included 950 patients with STEMI. Patients were divided into 2 groups as aVR(+) and aVR(−) according to the presence of an ST↑aVR of 0.5 mm or greater.

Results

ST elevation in lead aVR was seen in 155 (16%) patients, and LAD occlusion proximal to S₁ was detected in 52% of patients in the aVR(+) group and in 9% of patients in the aVR(−) group. aVR positivity was associated with higher heart rate, lower systolic blood pressure and ejection fraction, and worse Killip class at the hospital admission. In-hospital mortality was 19% in the aVR(+) group and 5% in the aVR(−) group. aVR positivity was an independent predictor of in-hospital death.

Conclusion

This study revealed that ST↑aVR was not only a good indicator of LAD occlusion proximal to S₁ but also a source of valuable information about in-hospital outcome in patients with STEMI.