Only the Avatar was the master of all four elements. Only he could stop the ruthless Fire Nation from conquering the world. But when the world needed him most, he disappeared. Until now... On the South Pole, a lone Water Tribe village struggles to survive.
Heart failure, sometimes known as congestive heart failure, occurs when your heart muscle doesn't pump blood as well as it should. Certain conditions, such as narrowed arteries in your heart (coronary artery disease) or high blood pressure, gradually leave your heart too weak or stiff to fill and pump efficiently.
Heart failure is the set of symptoms that hit you when your heart can't pump enough blood to meet your body's needs. It's called congestive because fluid settles in your lungs, congesting you. Honestly, I usually think of CHF as meaning Chronic Heart Failure.