In which condition would you expect to see S1Q3T3 pattern?

The S1Q3T3 pattern is a classic electrocardiogram (ECG) finding associated with right heart strain or pulmonary embolism. This pattern is characterized by a prominent S wave in lead I, a Q wave in lead III, and an inverted T wave in lead III.

In the context of pulmonary embolism, the presence of a clot in the pulmonary arteries can increase right ventricular pressure, leading to right heart strain. When the right ventricle is unable to cope with the increased pressure, it can result in changes in the ECG that manifest as this specific pattern.

The other conditions listed do not typically present with the S1Q3T3 pattern. For instance, left heart strain would present differently on an ECG, and atrial fibrillation and myocardial infarction each have their own distinct ECG signatures, which do not include the S1Q3T3 pattern. Understanding these patterns is essential for identifying and managing potential right heart issues and pulmonary embolism effectively.