A testing system commonly used to diagnose heart problems and other medical conditions has been recalled by the U.S. Food and Drug Administration.

Heart failure patients often take medication to lower their risk of stroke, hemorrhage or dying. A common choice is warfarin (Coumadin), though a large clinical trial has found that cheaper over-the-counter aspirin may be just as effective.

Excess amounts of fat and sugar force cells to self destruct when they can no longer stand the toxic environment. Scientists believe they now know why these overloaded cells commit suicide.