Peak cardiac troponin T levels correlated significantly with scintigraphic estimates of myocardial scar size (r = 0.73, P = 0.0011) in patients with first-time acute myocardial infarction.
Observational (n=21)
Does cardiac troponin T release correlate with scintigraphic estimates of myocardial scar in patients with acute myocardial infarction?
Cardiac troponin T peak values correlate closely with scintigraphic defect sizes, indicating it is a useful noninvasive marker for assessing infarct size in patients with acute myocardial infarction.
Effect estimate: r = 0.73
p-value: p=0.0011
Background This study compared clinical-chemical estimates of infarct size with scintigraphic estimates of myocardial scar in patients with first-time acute myocardial infarction (AMI). Methods Levels of the cardiac isoform of the contractile protein troponin T (TnT), of creatine kinase (CK), and of the isoenzyme MB of CK (CK MB) were tested in serially drawn blood samples from 21 patients (two females and 19 males; median age, 55 years). Of these 21 patients, five had anterior- and 16 had inferior-wall AMI; all patients received intravenous thrombolytic therapy. Single-photon emission computed tomography (SPECT) with technetium-99m-isonitrile (Tc-sestamibi) was performed at rest after the onset of AMI (median time, 5 weeks). Scintigraphic defects were calculated using “bull's-eye” polar coordinate maps. All patients had an uncomplicated course between discharge and myocardial scintigraphy. Results Scintigraphic defect sizes ranged from 3.2% to 47.8% of the left ventricle (median, 27.3%). Cardiac TnT and CK MB release correlated closely with each other and with scintigraphic estimates of myocardial scar. Significant correlates were found between cardiac TnT and CK MB peak values (r = 0.87, P = 0.0001), CK MB peaks and Tc-sestamibi defect sizes (r = 0.73, P = 0.0014), and TnT peaks and scintigraphic defect sizes (r = 0.73, P = 0.0011). Conclusions Because animal studies have already shown a very close correlation between histologic infarct size and SPECT Tc-sestamibi defect size, our results indicate that cardiac TnT is a useful marker to assess infarct size noninvasively in man.
Wagner et al. (Tue,) conducted a observational in first-time acute myocardial infarction (AMI) (n=21). Cardiac troponin T (TnT) levels was evaluated on Correlation between TnT peaks and scintigraphic defect sizes (r = 0.73, p=0.0011). Peak cardiac troponin T levels correlated significantly with scintigraphic estimates of myocardial scar size (r = 0.73, P = 0.0011) in patients with first-time acute myocardial infarction.