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Heart failure is a condition or a collection of symptoms in which the heart is not  pumping enough blood to meet the body's needs.

Your electrophysiologist will determine the cause of heart failure and if there is a reversible cause heart failure may improve by its correction.

In a subset of heart failure patient with certain conduction abnormality known as left bundle branch block (LBBB) detected on ECG the lower chambers of heart may not pump blood in a synchronise manner resulting in decreased cardiac output and a device known to provide  cardiac resynchronization is used known as CRT.

CRT  device sends small, undetectable electrical impulses to both lower chambers of the heart to help them beat together in a more synchronized pattern. This improves the heart's ability to pump blood and oxygen to the body.

CRT-D : in addition to improving pumping function provides additional defibrillation capability which is mostly required in weak hearts.