Medicine ECG feature of acute cor pulmonale (e.g. Pulmonary embolism) A S1Q3T3 pattern B Slow "r" wave progression in leads V1 to V4 C Atrial fibrillation D All of the above three 💡 Explanation ECG feature of acute cor pulmonale (e.g. Pulmonary embolism) ✓ Correct Answer: D. All of the above three