Clinical features

Why?

Nausea and vomiting makes a myocardial infarction more likely

Patient	Target Disorder and   Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
attending emergency department with chest pain b (pre-test probability: 20%)	myocardial infarction (ECG and cardiac enzyme changes)	nausea or vomiting	1.9 (1.7 to 2.3)	32%
anterior chest pain b (pre-test probability: 12%)	myocardial infarction (cardiac enzymes, ECG)	history of associated nausea	1.9 (1.4 to 2.4)	21%	0.63 (0.47 to 0.84)	8%