Clinical features

• an irregular ^b or slow-rising pulse ^b

Why?

An irregular pulse makes an arrhythmia more likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
undergoing Holter monitoring b (pre-test probability: 53%)	arrhythmia (Holter monitoring)	irregular pulse	8.9 (1.2 to 69)	91%	0.97 (0.94 to 0.99)	52%