The inability of the heart muscle to pump blood at a life-sustaining rate is best defined as:

Answer: Congestive Heart Failure

Congestive heart failure is the inability of the heart muscle to pump blood at a life-sustaining rate. Such conditions as high blood pressure and narrowed arteries of the heart leave your heart stiff to pump efficiently.

There are lots of signs of heart failure which you should not ignore. Better see your doctor and seek emergency treatment if you experience chest pain, fainting, rapid or irregular heartbeat coupled with shortness of breath.