<prompt> Troponin-T is preferable to CPK-MB in the diagnosis of acute myocardial infraction in all the following situations exceptBeside diagnosis of MIPostoperatively - after CABGReinfraction after 4 daysSmall infracts  <response>: Ref Harrison 19 th ed pg 1594 Because of cardiac troponins are elevated for prolonged periods an episode of recurrent ischemia after four days would be more readily diagnosed with a marker that remains elevated in blood more briefly such as CK-MB which returns to normal levels by 72 hours . 