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Troponin I is a biomarker that responds to treatment interventions. Reductions in troponin I levels proved to reduce the risk of future CVD. [23] [24] [25] High sensitive troponin I used as a screening tool to assess a person's cardiovascular risk and has the potential to reduce the growing cost burden of the healthcare system. [26]
[27] [28] [29] High troponin T levels have also been reported in patients with inflammatory muscle diseases such as polymyositis or dermatomyositis. [30] [31] Troponins are also increased in rhabdomyolysis. In hypertensive disorders of pregnancy such as preeclampsia, elevated troponin levels indicate some degree of myofibrillary damage. [32] [33]
Test Sensitivity and specificity Approximate peak Description Troponin test: The most sensitive and specific test for myocardial damage. Because it has increased specificity compared with CK-MB, troponin is composed of 3 proteins- Troponin C, Cardic troponin I, and Cardiac troponin T. Troponin I especially has a high affinity for myocardial injury.
Elevated troponin levels indicate the heart is damaged and doctors can use this measure to diagnose heart attack. “Everybody sprung into action,” Hutt says. “They were testing my troponin ...
Troponin T binds to tropomyosin and helps position it on actin, [2] and together with the rest of the troponin complex, modulates contraction of striated muscle. [3] The cardiac subtype of troponin T is especially useful in the laboratory diagnosis of heart attack because it is released into the blood-stream when damage to heart muscle occurs. [4]
A complete blood count may show an elevated white count and a serum C-reactive protein may be elevated. Acute pericarditis is associated with a modest increase in serum creatine kinase MB (CK-MB). [ 5 ] and cardiac troponin I (cTnI), [ 6 ] [ 7 ] both of which are also markers for injury to the muscular layer of the heart.
Cardiac troponin T (low sensitive) 0.1 [7] ng/mL: 99th percentile cutoff: Cardiac troponin I (high sensitive) 0.03 [7] ng/mL 99th percentile cutoff: Cardiac troponin T (high sensitive) Male 0.022 [7] ng/mL 99th percentile cutoff: Female 0.014 [7] ng/mL 99th percentile cutoff: newborn/infants not established more than adults [60] [61]
Fifty percent of people with unstable angina will have evidence of necrosis of the heart's muscular cells based on elevated cardiac serum markers such as creatine kinase isoenzyme (CK)-MB and troponin T or troponin I, and thus have a diagnosis of non-ST elevation myocardial infarction. [15] [16]