[Evaluation of whole blood rapid troponin T assay: cooperative study of general practitioners and office cardiologists in Tokyo].
The recently developed whole blood rapid assay for cardiac troponin T (TROP T) was evaluated by a cooperative study of general practitioners and office cardiologists in the Tokyo area (Tokyo TROP T Trial). Seventy patients with suspected acute myocardial infarction treated at 14 medical clinics were enrolled in this study. The diagnostic efficacy of troponin T was compared with that of electrocardiographic evaluations and clinical standards for diagnosis of acute myocardial infarction. Twelve of the 70 patients (17.1%) had final diagnoses of acute myocardial infarction or severe unstable angina necessitating emergency coronary intervention. Troponin T was judged as positive when simultaneously measured serum troponin T was more than 0.25 ng/ml. Sensitivity, specificity, positive predictive value, and negative predictive value were 100%, 58.6%, 33.3%, and 100% for electrocardiographic evaluation, and 58.3%, 100%, 100%, and 92.1% for troponin T, respectively. Presence of bundle branch block (11/70 cases) or previous myocardial infarction (14/70 cases) caused false positive readings on electrocardiography, and resulted in the lower positive predictive value. In contrast, troponin T was false in patients admitted within 4 hours after the onset, or patients with smaller infarct. The Tokyo TROP T Trial by general practitioners and office cardiologists concluded that the combination of electrocardiographic evaluation and use of troponin T is a rapid and efficient diagnostic method for the evaluation of patients with suspected acute myocardial infarction.
Seino
Y
Y
First Department of Internal Medicine, Nihon Medical School, Tokyo.
Nejima
J
J
Takayama
M
M
Takano
T
T
Ohbayashi
K
K
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood*; D002037:Bundle-Branch Block / Q000150:complications; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D012680:Sensitivity and Specificity; D014336:Troponin / Q000097:blood*; D020107:Troponin T
D015415:Biomarkers; D014336:Troponin; D020107:Troponin T