Which of the following indicates a lateral wall MI on an ECG?

The presence of ST elevation in leads I, aVL, V5, and V6 is indicative of a lateral wall myocardial infarction (MI). These leads correspond to the lateral aspect of the heart, specifically supplied by the left circumflex coronary artery or the diagonal branches of the left anterior descending artery.

In a lateral wall MI, the ischemic process affects the left lateral wall of the left ventricle, which is represented by the specific leads that show ST elevation. These leads monitor the electrical activity from the lateral portion of the heart, and when there is an obstruction or reduction in blood flow due to an MI, it manifests as ST segment elevation in these particular leads.

Leads II, III, and aVF primarily represent the inferior wall of the heart, so ST elevation in these leads would suggest an inferior MI instead. Leads V1-V4 indicate an anterior or anterior-septal infarction, and ST depression in leads V1-V3 is more typical of ischemia or non-ST elevation myocardial infarction (NSTEMI) but does not specifically indicate a lateral wall MI. Hence, the identification of lateral wall MI through electrocardiographic changes relies on the specific leads that are elevated during this type of myocardial infar