best heart centers in yelahanka Heart failure When a person has heart failure, the heart is still working but not as well as it should. Congestive heart failure is a type of heart failure. Heart failure can result from untreated coronary artery disease, high blood pressure, arrhythmias, and other conditions. These conditions can affect the heart’s ability to pump properly. Heart failure can be life threatening, but seeking early treatment for heart-related conditions can help prevent complications.