Clinical features

Why?

Chest or left arm pain makes a myocardial infarction more likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability
attending emergency department with chest pain b (pre-test probability: 20%)	myocardial infarction (ECG and cardiac enzyme changes)	pain in chest or left arm	2.7	40%

Pain migration makes aortic dissection slightly more likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected aortic dissection undergoing angiography c   (pre-test probability: 1%)	aortic dissection (angiography, surgery or autopsy)	pain migration	1.3 (1.0 to 1.8)	1.3%	0.64 (0.43 to 0.93)	0.64%