References in periodicals archive ?
The classic ECG findings of right ventricular strain in the presence of PE are S waves in lead I, Q waves in lead III, and inverted T waves in lead III (S1Q3T3).
For example, ST-segment elevation that is greater in lead III than in lead II suggests RCA involvement, (8,9) and isolated ST-segment depression in leads [V.
The ECG with ST-segment elevation also revealed development of a deep S in lead I and a new Q wave in lead III, but the T-wave was unchanged, thereby not fulfilling the classic "SIQ3T3 pattern" observed in a small number of patients with pulmonary embolism and pneumothorax.