Final answer:
Arresting the heart reduces MO2 (oxygen consumption) by decreasing the amount of oxygen reaching the body's organs and tissues.
Step-by-step explanation:
Arresting the heart reduces MO2 (oxygen consumption) by decreasing the amount of oxygen reaching the body's organs and tissues. This reduction in oxygen supply can aggravate heart disease and result in symptoms such as chest pain, leading to hospital admissions and emergency department visits.