<prompt> ST segment elevation is seen in: September 2005Prinzmetals anginaAcute pericarditisAcute MIAll of the above  <response>: Ans. D: All of the above Differential Diagnosis of ST Segment Elevation: Ischemic Hea Disease usually convex upwards, or straightened - Acute transmural injury acute anterior MI Persistent ST elevation after acute MI suggests ventricular aneurysm - ST elevation may also be seen as a manifestation of Prinzmetals variant angina coronary aery spasm Acute Pericarditis - Concave upwards ST elevation in most leads except aVR - No reciprocal ST segment depression except in aVR - May see PR segment depression, a manifestation of atrial injury Other Causes: - Left ventricular hyperophy in right precordial leads with large S-waves - Left bundle branch block in right precordial leads with large S-waves - Advanced hyperkalemia - Hypothermia prominent J-waves or Osborne waves 