Heart failure affects 900 000 people in the United Kingdom. 1 Its prevalence is increasing owing to improved prognosis of ischaemic heart disease (the major cause of heart failure) and an ageing population. 2 3 The two main types of heart failure are left ventricular systolic dysfunction and that associated with preserved left ventricular ejection fraction. Both types have a poor prognosis, although the introduction of effective treatments has led to a fall in mortality from heart failure caused by left ventricular systolic dysfunction (from 26% at six months in 1995 to 14% at six months in 2005). 4 New evidence has emerged on diagnosis, treatment, rehabilitation, and monitoring of people with heart failure, and use of this evidence to guide diagnosis and management is likely to improve outcomes further and increase the cost effectiveness of services. This article summarises the most recent recommendations from the National Institute for Health and Clinical Excellence (NICE) on the diagnosis and management of chronic heart failure (which is a partial update of its 2003 guidelines 5). 6