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.
Congestive Heart Failure Causes. Congestive heart failure (CHF) is a syndrome that can be brought about by several causes. Congestive heart failure is a weakening of the heart caused by an underlying heart or blood vessel problem, or a combination of several different problems, including the following: Weakened heart muscle (cardiomyopathy) Damaged heart valves.