Clinical features

Why?

No dyspnoea exertion makes left ventricular failure very unlikely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected heart failure b (pre-test probability: 17%)	left ventricular systolic failure (echocardiogram)	dyspnoea on exertion	1.2 (1.1 to 1.3)	18%	0.0 (0.0 to 0.084)	0%