Clinical features

• heart failure ^a  
• ischaemic heart disease ^a

Why?

Heart failure and ischaemic heart disease increase the risk of dying

Patient	Prognostic Factor	Outcome	CER	OR (95% CI)	NNF+ (95% CI)
unexplained syncope a	congestive heart failure independent	death at 2 years	16% (11% to 20%)	4 (1.9 to 8.1)	4 (2 to 10)
	mild heart disease independent	death at 12 months	9% (5% to 12%)	7.7 (1.6 to 36.4)	2 (1 to 19)
	severe heart disease independent	death at 12 months	9% (5% to 12%)	13.5 (2.6 to 70.5)	1 (1 to 7)