Evidence-based On-call

Syncope

Clinical features

Ask about the syncopal episode ^d, particularly:

Why?

Exertional syncope makes aortic stenosis much more likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
elderly patient with syncope ^b (pre-test probability: 5%)	aortic stenosis (imaging studies)	effort syncope	infinity (1.3 to infinity)	100%	0.76 (0.67 to 0.86)	4%