Elevated troponin I in patients with normal or mild coronary disease had no identifiable cause in 10 of 21 cases, with no deaths or myocardial infarction occurring over 41 weeks of follow-up.
Observational (n=21)
No
What are the precipitating events for troponin I elevation in patients with angiographically normal coronary arteries?
Troponin I elevation can occur without significant angiographic coronary artery disease due to various non-ischemic causes, highlighting that it is a sensitive marker of myocardial injury but not synonymous with infarction.
BACKGROUND: The new definition of myocardial infarction (MI) emphasizes the pre-eminent role of troponin for diagnosis. Troponin rise indicates myocardial injury, but is not synonymous with infarction or ischaemia. AIMS: To review the precipitating event for troponin elevation in patients with angiographically normal coronary arteries, in a district general hospital. METHODS: Consecutive patients with elevated troponin I (TnI) who underwent angiography for suspected coronary disease were included in the present study if they had normal or mild disease (<50% diameter loss without complex features or thrombus). Precipitating event for TnI elevation was assigned on the totality of clinical evidence. RESULTS: Twenty-one patients qualified, with an average age of 50 years (range 33-73). Sixty-two per cent of participants were female. Troponin release was attributed to tachycardia in six patients, only two of whom had haemodynamic compromise. Physical exertion was the precipitating factor in two patients; pericarditis in two patients; and severe congestive heart failure in one patient. Ten of 21 patients had no identifiable cause for a rise in TnI concentration. Five of 21 patients had left-ventricular wall motion abnormalities. There were no deaths or MI at 41 +/- 24 weeks follow up. CONCLUSION: Troponin is a sensitive marker of myocardial injury and may rise following apparently minor insults. A rise in TnI concentration may have a cause other than acute coronary syndrome and may occur without significant angiographic coronary artery disease.
Bakshi et al. (Wed,) conducted a observational in Elevated troponin I with normal or mild coronary artery disease (n=21). Elevated troponin I without significant coronary artery disease was evaluated on Precipitating event for TnI elevation. Elevated troponin I in patients with normal or mild coronary disease had no identifiable cause in 10 of 21 cases, with no deaths or myocardial infarction occurring over 41 weeks of follow-up.
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