ECG Likelihood Ratios

Table 9: Value of specific components of the ECG for the diagnosis of acute myocardial infarction(12-14)

ECG finding Likelihood ratio
Ref12 Ref13 Ref14
Increased likelihood of AMI:
    New ST segment elevation 5.7-53.9* 13.1 2.1-8.6
    New Q wave formation 5.3-24.8* 5.0
    New conduction deficit 6.3
    ‘ischaemic ECG’ 1.6-5.7
    New ST segment depression 3.0-5.2* 3.13
    T-wave peaking and/or inversion 3.1 1.9
Decreased likelihood of AMI:
    Normal ECG 0.1-0.3 0.1

* In heterogenous studies likelihood ratios expressed as a range

** Ischemic ECG defined as any T wave inversion, ST depression, Q waves