Cardiac troponin I as diagnostic and prognostic marker in severe heart failure
| Autor: | Luigi La Vecchia, Mariemma Paccanaro, R. Ometto, Luisa Zanolla, Carlo Bonanno, Leonardo Varotto, G Mezzena |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Pulmonary and Respiratory Medicine
Adult Male medicine.medical_specialty Cardiac Catheterization Heart disease Adolescent Biopsy Fluoroimmunoassay macromolecular substances Coronary Angiography Severity of Illness Index medicine.artery Internal medicine Troponin I Medicine Humans cardiovascular diseases Prospective Studies Aged Aged 80 and over Heart Failure Transplantation Ejection fraction biology business.industry Proportional hazards model Myocardium Hazard ratio musculoskeletal system medicine.disease Prognosis Troponin Surgery Echocardiography Doppler Color Heart failure Pulmonary artery cardiovascular system biology.protein Cardiology Female Cardiology and Cardiovascular Medicine business Biomarkers |
| Zdroj: | The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation. 19(7) |
| ISSN: | 1053-2498 |
| Popis: | Background Cardiac cell death has been shown to occur in heart failure and has been implicated as one of the mechanisms responsible for progression of the disease. Cardiac Troponin I (cTnI) represents a highly sensitive marker for myocardial cell death. Based on previous studies reporting that cTnI may be detected in patients with heart failure, we evaluated the clinical correlates and prognostic implications of detectable cTnI in a consecutive series of patients with severe heart failure. Methods Thirty-four patients were examined. Upon admission, we measured serum levels of cTnI by conventional immunoenzymatic assay (Stratus Dade II). According to the results of this assay, patients were divided into 2 groups, based on the presence (cTnI+) or absence (cTnI−) of detectable cTnI. These 2 groups were compared by non-parametric analysis for their clinical characteristics, instrumental findings, and short-term outcome. Results The cTnI+ group included 10 patients (29%) with a mean serum cTnI of 0.7 ± 0.3 ng/ml. Compared with the cTnI− group, these patients had significantly lower left ventricular ejection fractions (20% ± 5% vs 26% ± 7%, p = 0.023) and a trend for higher systolic pulmonary artery pressure (59 ± 17 mm Hg vs 49 ± 13 mm Hg, p = 0.08). In cTnI+ patients, the correlation between cTnI levels upon admission and ejection fraction was r = −0.530 ( p = 0.11). We found ischemic etiology was equally present in the 2 groups, whereas we never found histologic signs of acute myocarditis. Other clinical characteristics (functional class, daily diuretic dose, need for intravenous inotropes) were not statistically different in the 2 groups. In cTnI+ patients who improved after admission, cTnI became undetectable after a few days; in patients with refractory heart failure who were hospitalized until death, cTnI persisted in detectable levels throughout the observation period. Using the Cox proportional hazard model, a positive cTnI was the most powerful predictor of mortality at 3 months ( p = 0.013; hazard ratio 6.86; 95% confidence interval 1.32 to 35.4). Conclusions These observations suggest that cTnI is detected in the blood of 25% to 33% of patients with severe heart failure; its presence may help to identify a high-risk sub-group who faces very poor short-term prognosis. |
| Databáze: | OpenAIRE |
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