S1Q3T3 pattern may appear in which condition but is not sensitive?

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Multiple Choice

S1Q3T3 pattern may appear in which condition but is not sensitive?

The key idea here is that S1Q3T3 on the ECG is a sign of acute right heart strain that can occur with pulmonary embolism, but it is not a sensitive marker for PE. The pattern consists of a prominent S wave in lead I, a Q wave in lead III, and often a T-wave inversion in lead III. Its presence can raise suspicion for a PE in the right clinical setting because the sudden obstruction increases right-sided pressures. However, many patients with pulmonary embolism do not show this pattern, especially if the embolism is small or if other factors alter ECG findings. So while seeing S1Q3T3 makes PE more likely, not seeing it does not exclude PE. Among the options, pulmonary embolism is the condition most classically associated with this pattern, whereas the other conditions—myocardial infarction, atrial fibrillation, and pericarditis—do not rely on this pattern as a diagnostic indicator.

The key idea here is that S1Q3T3 on the ECG is a sign of acute right heart strain that can occur with pulmonary embolism, but it is not a sensitive marker for PE. The pattern consists of a prominent S wave in lead I, a Q wave in lead III, and often a T-wave inversion in lead III. Its presence can raise suspicion for a PE in the right clinical setting because the sudden obstruction increases right-sided pressures. However, many patients with pulmonary embolism do not show this pattern, especially if the embolism is small or if other factors alter ECG findings. So while seeing S1Q3T3 makes PE more likely, not seeing it does not exclude PE. Among the options, pulmonary embolism is the condition most classically associated with this pattern, whereas the other conditions—myocardial infarction, atrial fibrillation, and pericarditis—do not rely on this pattern as a diagnostic indicator.

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