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Circulation Research 2016-Dec

Diagnostic and Prognostic Utility of Circulating Cytochrome c in Acute Myocardial Infarction.

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Giancarlo Marenzi
Nicola Cosentino
Jasper Boeddinghaus
Mirella Trinei
Marco Giorgio
Valentina Milazzo
Marco Moltrasio
Daniela Cardinale
Maria Teresa Sandri
Fabrizio Veglia

Nyckelord

Abstrakt

BACKGROUND

In contrast to cardiomyocyte necrosis, which can be quantified by cardiac troponin, functional cardiomyocyte impairment, including mitochondrial dysfunction, has escaped clinical recognition in acute myocardial infarction (AMI) patients.

OBJECTIVE

To investigate the diagnostic accuracy for AMI and prognostic prediction of in-hospital mortality of cytochrome c.

RESULTS

We prospectively assessed cytochrome c serum levels at hospital presentation in 2 cohorts: a diagnostic cohort of patients presenting with suspected AMI and a prognostic cohort of definite AMI patients. Diagnostic accuracy for AMI was the primary diagnostic end point, and prognostic prediction of in-hospital mortality was the primary prognostic end point. Serum cytochrome c had no diagnostic utility for AMI (area under the receiver-operating characteristics curve 0.51; 95% confidence intervals 0.44-0.58; P=0.76). Among 753 AMI patients in the prognostic cohort, cytochrome c was detectable in 280 (37%) patients. These patients had higher in-hospital mortality than patients with nondetectable cytochrome c (6% versus 1%; P<0.001). This result was mainly driven by the high mortality rate observed in ST-segment-elevation AMI patients with detectable cytochrome c, as compared with those with nondetectable cytochrome c (11% versus 1%; P<0.001). At multivariable analysis, cytochrome c remained a significant independent predictor of in-hospital mortality (odds ratio 3.0; 95% confidence interval 1.9-5.7; P<0.001), even after adjustment for major clinical confounders (odds ratio 4.01; 95% confidence interval 1.20-13.38; P=0.02).

CONCLUSIONS

Cytochrome c serum concentrations do not have diagnostic but substantial prognostic utility in AMI.

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