Cardiac Medicine Certification (CMC) Practice Exam 2026 - Free Heart Health Practice Questions and Study Guide

ST elevation in V1 during an inferior wall myocardial infarction (MI) suggests the presence of right ventricular infarction. When an inferior wall MI occurs, typically caused by occlusion of the right coronary artery, the right ventricle may also be affected, particularly if the infarction involves the proximal portion of the artery.

In this context, ST elevation in V1 can indicate that there is a right ventricular involvement because V1 is positioned over the right side of the heart. When there's right ventricular infarction, it’s often accompanied by hemodynamic changes such as decreased preload leading to a reduction in left ventricular filling, which can cause profound hypotension and a risk of cardiogenic shock. Clinicians will often look for this additional ST elevation in V1 to recognize the extent of the myocardial damage and assess the need for interventions like fluid resuscitation or specific surgical procedures.

Understanding this relationship is crucial for proper diagnosis and management, as patients with right ventricular MI may require different treatment approaches compared to those with isolated inferior wall MIs.