Table 3 Likelihood ratios for the diagnosis of ACS with clinical myocardial infarction at presentation
From: Which diagnostic tests are most useful in a chest pain unit protocol?
Positive likelihood ratio (95% CI) | Negative likelihood ratio (95% CI) | |
|---|---|---|
Serial ECG & ST monitoring N = 690 | 7.1 (3.8 to 13.1) | 0.700 (0.543 to 0.901) |
Initial CK-MB(mass) N = 687 | 20.8 (12.5 to 34.7) | 0.378 (0.236 to 0.605) |
Delayed CK-MB(mass) N = 601 | 25.1 (16.5 to 38.2) | 0.045 (0.007 to 0.307) |
Delta CK-MB(mass) N = 601 | 61.4 (39.1 to 118.1) | 0.044 (0.006 to 0.300) |
Any positive CK-MB(mass) N = 601 | ~25* | ~0* |
Troponin T > = 0.1 ng/ml N = 686 | 70.4 (34.1 to 140.8) | 0.169 (0.079 to 0.387) |
Troponin T > = 0.03 ng/ml N = 686 | 23.5 (16.1 to 34.2) | 0.037 (0.005 to 0.255) |