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Related to troponin I: Troponin T
troponin ICardiology A contractile protein that ↑ in serum after myocardial necrosis; it is a sensitive and specific marker of acute MI, and better than CK-MB as a cardiac injury marker Indications Acute, recent, or perioperative MI, cardiac contusion, heart allograft rejection, assessment of side-branch occlusion during coronary revascularization procedures or thrombolysis. See Myocardial infarction. Cf Surrogate marker.
A protein that is released into the blood by damaged heart muscle (but not skeletal muscle), and therefore is a highly sensitive and specific indicator of recent myocardial infarction.
See also: troponin