51.   Doctors have long known that heavy drinking destroys the heart muscle until it is too weak to pump blood.

52.   In open-heart surgery, hooking up the heart-lung machine that oxygenates and pumps blood is relatively simple.

53.   It worked alongside his heart, helping to pump blood.

54.   It works alongside his heart, helping to pump blood around the body.

55.   Patients with severe cases feel weak, faint or breathless, as their heart struggles to pump blood properly.

56.   The heart works harder to pump blood through these slimmer tubes and the pressure goes up.

57.   This means that less blood is pumped out of the heart for the rest of body.

58.   This would hamper blood flow to the heart and at the same time weaken the heart muscle forcing it to work harder to pump blood around the body.