A heart bypass operation relies on the talents of a surgical team but they can't do it alone - they need the help of a heart-lung bypass machine to keep the patient alive. This machine keeps the chest organs motionless while a continuous supply of oxygen and nutrients is pumped through the circuit. Watch the procedure above and witness the tense moments between life and death.

Animation developed by Visible Productions, Inc.

Dr. Oz goes where he's never gone before. He's letting you eat fast-food and it's not what you expect. Learn which fast food meals you can eat under 500 calories while still enjoying the food you love.