What defines cold cardioplegia and one of its benefits?

What defines cold cardioplegia and one of its benefits?

• A. Body temperature reduced to 95 degrees F; decreases metabolic needs of the body and O2 consumption.
• B. Body temperature remains at baseline; decreases post op complications.
• C. The patient's body temperature rises above normal.
• D. Uses warm saline to arrest the heart.

Answer: (A)

Cold cardioplegia works by cooling the heart so its metabolic activity slows down. Lowering the temperature reduces the myocardium’s oxygen needs and ATP consumption, which protects heart tissue during the period of arrest on bypass. This is the key benefit: a cooler heart uses less oxygen, making ischemic time safer and helping preserve heart muscle. The description in this question matches that concept: the body or heart is cooled to a lower temperature, leading to decreased metabolic demands and oxygen consumption. The other statements describe keeping temperature normal, warming the heart, or using warm saline, which are not characteristic of cold cardioplegia and are associated with different strategies.

Cold cardioplegia works by cooling the heart so its metabolic activity slows down. Lowering the temperature reduces the myocardium’s oxygen needs and ATP consumption, which protects heart tissue during the period of arrest on bypass. This is the key benefit: a cooler heart uses less oxygen, making ischemic time safer and helping preserve heart muscle.

The description in this question matches that concept: the body or heart is cooled to a lower temperature, leading to decreased metabolic demands and oxygen consumption. The other statements describe keeping temperature normal, warming the heart, or using warm saline, which are not characteristic of cold cardioplegia and are associated with different strategies.