A specialist in cardiac electrophysiology is known as a cardiac electrophysiologist, or (more commonly) simply an electrophysiologist. Cardiac electrophysiology is considered a subspecialty of cardiology in most countries and usually requires two or more years of fellowship training beyond a general cardiology fellowship.
PHOTOS: William and Kate's childhood pictures. But as with her first pregnancy, Duchess Kate is suffering from hyperemesis gravidarum, a very acute morning sickness, which required an in-patient stay at King Edward VII's Hospital during her pregnancy with Prince George. So far with this pregnancy, however, the Duchess is being treated at home.
The Middletons had three children - Pippa, James and Kate. Women's fertility declines rapidly after the age of 35, meaning the Duchess could choose to have a third child within two years of giving birth to Princess Charlotte.