<prompt> What is the most common ECG finding for pulmonary embolism?Sinus tachycardiaS1 Q3 T3T wave inversionEpsilon waves  <response>: MC ECG abnormality in pulmonary embolism- Sinus tachycardia MC symptom is unexplained breathlessness. Screening test - D-dimer test. Most specific finding is S1Q3T3. The classic findings of right hea strain and acute cor pulmonale are tall, peaked P waves in lead II P pulmonale; right axis detion; right bundle-branch block and S1Q3T3 pattern. 