RCIS Practice Test 2025 – All-in-One Exam Prep

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Question: 1 / 400

Which type of infarct is indicated by ST elevation in leads II, III, and AVF?

Anterior wall

Lateral wall

Inferior wall

The presence of ST elevation in leads II, III, and AVF is indicative of an inferior wall myocardial infarction. These leads correspond to the inferior portion of the heart, which is supplied by the right coronary artery in the majority of individuals. When this area experiences a lack of blood flow, it manifests as ST elevation on the electrocardiogram in these specific leads.

Infarcts in other regions, such as the anterior wall, lateral wall, or posterior wall, would produce ST elevation in different lead groups. For example, the anterior wall is associated with leads V1 to V6, while lateral wall infarcts are typically seen in leads I, aVL, V5, and V6. The posterior wall is represented primarily by changes in leads V7 to V9 and reciprocal changes in the anterior leads. Therefore, recognizing where ST elevation occurs on the ECG is crucial for identifying the location of the myocardial infarction effectively.

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Posterior wall

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