Final answer:
Hypothermia decreases oxygen consumption as the body temperature drops. Emergency department physicians use controlled hypothermia to reduce damage to the heart in patients who have suffered a cardiac arrest. This slows down the patient's metabolic rate and reduces the heart's workload.
Step-by-step explanation:
Hypothermia is a dangerous decrease in core body temperature below 34.4 degrees C (94 degrees F). When the body temperature drops, hypothermia reduces oxygen consumption. For every degree drop, hypothermia causes a decrease in oxygen consumption, slowing down the body's metabolic rate.
For example, emergency department physicians use controlled hypothermia to reduce damage to the heart in patients who have suffered a cardiac arrest. By inducing coma and lowering the patient's body temperature to approximately 91 degrees, the patient's metabolic rate slows down. This decrease in metabolic rate reduces the workload on the heart, as the organs require less blood to function.