Key result
The down-slope of the plasma troponin elimination curve after cardiac surgery was significantly more gentle than after myocardial infarction (-0.91 vs -5.31, p < 0.01).
Why the study?
Do plasma troponin elimination curves differ after cardiac surgery compared to after myocardial infarction?
Meta-Analysis (n=1,221)
Do plasma troponin elimination curves differ after cardiac surgery compared to after myocardial infarction?
Absolute Event Rate: -0.91% vs -5.31%
p-value: p=< 0.01
Troponin elimination kinetics differ significantly between cardiac surgery and myocardial infarction, suggesting different mechanisms of troponin release and clearance that complicate postoperative MI diagnosis.
Slower troponin clearance after cardiac surgery may confound postoperative MI diagnosis; extends evidence for distinct elimination kinetics versus spontaneous MI.
Raised plasma troponin, a diagnostic marker for myocardial infarction, usually occurs after cardiac surgery, leading to difficulties in diagnosing postoperative myocardial infarction. To ascertain whether the same processes influence troponin elevation in both conditions, a literature search was performed for plasma troponin elimination curves after myocardial infarction, myocardial infarction with reperfusion, and cardiac surgery. From 70 studies, 11 curves using the Stratus immunoassay kit were analyzed: 5 post-cardiac surgery (412 patients), 2 after myocardial infarction with reperfusion (169 patients), and 4 after myocardial infarction (640 patients). For each group, a new plot was formulated from the mean troponin level at each time interval. While the up-slope of the cardiac surgery curve was much steeper than that of myocardial infarction, resembling that of myocardial infarction with reperfusion, its down-slope was significantly more gentle than that of both other groups (-0.91 vs -5.31, t = 3.47, df = 8, p < 0.01). This suggests that postoperative troponin elevation involves enhanced cell permeability as seen after ischemia reperfusion rather than permanent cellular damage. The gentler down-slope may point to surgery-induced impaired troponin removal from the circulation. Due to the different mechanisms proposed, implications from post-myocardial infarction troponin levels may not be conferred on post-cardiac surgery patients.
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Abramov et al. (2006) conducted a meta-analysis in Cardiac surgery and myocardial infarction (n=1,221). Cardiac surgery vs. Myocardial infarction and myocardial infarction with reperfusion was evaluated on Plasma troponin elimination curve down-slope (p=< 0.01). The down-slope of the plasma troponin elimination curve after cardiac surgery was significantly more gentle than after myocardial infarction (-0.91 vs -5.31, p < 0.01).
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