<s>[INST] What is heart failure? [/INST] 
Heart failure is a serious medical condition in which the heart does not pump blood around the body as effectively as it should. It is due to the weakening of the heart muscles and valves. The risk of heart failure increases with age. Source: NARAYANA HEALTH . Link: https://www.narayanahealth.org/blog/common-patient-questions-related-to-heart-failure/. Field: Cardiovascular. Disease: Heart Failure </s>