Troponin T levels in detection of perioperative myocardial infarction after coronary artery bypass surgery.
OBJECTIVE
The present study was designed to evaluate the clinical relevance of serum cardiac troponinT (cTnT) assay in detection of perioperative myocardial infarction (PMI) after coronary artery bypass grafting (CABG).


METHODS
The clinical utility of cTnT was compared to that of total CK, CKMB mass, CKMB activity and myoglobin. Serial venous blood samples were obtained before surgery and 4, 8, 16, 24, 48 and 72 hours after aortic unclamping (AU) in 42 patients who underwent CABG. We had 6 PMI patients, 24 patients with minor myocardial damage (MMD) and 12 without ischemic myocardial changes (no IMC).


RESULTS
In discriminating no IMC from PMI the diagnostic sensitivity, specificity and the predictive values of cTnT were superior to that of CKMB mass, CKMB activity, myoglobin and total CK during 72 hours after AU. In discriminating MMD from PMI the diagnostic performance for CKMB mass and CKMB activity was superior to that of cTnT during the first 24 hours. After 24 hours the diagnostic performance for cTnT was improved but began to decline for CKMB isoenzymes. The discriminatory power of myoglobin measurements was lower than that of cTnT and CKMB mass.


CONCLUSIONS
Our results indicate that troponin T is an accurate marker for the detection and monitoring of perioperative myocardial damage, especially 24 hours after AU.
Department of Medical Biochemistry, Dedinje Cardiovascular Institute, School of Medicine, Belgrade, Serbia & Montenegro. marx@beotel.yu
Radmila
R
Kovacević
Nada
N
Majkić-Singh
Svetlana
S
Ignjatović
Petar
P
Otasević
Radmila
R
Obrenović
Monique
M
Paris
Branislav
B
Vilotijević
Jean Léon
JL
Guermonprez
D001026:Coronary Artery Bypass / Q000009:adverse effects*; D003402:Creatine Kinase / Q000097:blood; D005260:Female; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000175:diagnosis*; D011183:Postoperative Complications / Q000175:diagnosis*; D012372:ROC Curve; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D013997:Time Factors; D020107:Troponin T / Q000097:blood
D020107:Troponin T; D003402:Creatine Kinase