Which of the following is not a component of classical triad of ECG changes in pericardial effusion with cardiac tamponade?
Sinus tachycardia
Prolonged ST segment
Low voltage QRS complex
Electrical alternans
Ans. B. Prolonged ST segmentProlonged ST segment is not a part of classic triad of ECG findings for pericardial effusion with cardiac tamponade.* Classical triad of ECG changes in pericardial effusion with cardiac tamponade includes:- Sinus tachycardia- Low QRS voltages- Electrical alternans (best seen in leads V3 and V4 in this case; arrows)* This triad is highly specific for pericardial effusion, usually with tamponade physiology, but of limited sensitivity
C.V.S.