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Likelihood Ratio (LR) in Emergency Medicine


Atypical or typical, is this the question?

Clinical Scenarios

It is a busy day in your ED:

A 60 y/o female refers a retrosternal pain radiates to right arm that lasts more than 20 minutes. 

A 50 y/o male refers a pressure  in his chest, with tachycardia and sweating.

A 75 y/o female refers a sharp and stabbing pain exacerbates by forceful breathing.

In all cases the ECGs are nondiagnostic.
Do these clinical features help to predict an acute myocardial infarction (AMI)?