Dr Jay Wright, a consultant cardiologist at Liverpool Heart and Chest Hospital, is about to start a trial using electricity to shrink the hearts of patients with heart failure.

It will involve electrically stimulating one of the nerves leading to the heart, which it is hoped could shrink the heart and improve life expectancy.

As the heart loses its ability to pump, it fills with too much blood and becomes stretched over time. The more the heart enlarges, the worse the symptoms.
They will fit a device similar to a pacemaker to the vagus nerve which runs to the heart. Surgeons said the electrical stimulation should protect the heart.  The idea is that by shielding the heart, it will stop enlarging and begin to shrink.

Source: BBC