Algorithms for bradyarrhythmia/asystole (left) or pulseless electrical activity (right) are dominated by cardiopulmonary resuscitation (CPR) and a search for reversible causes. MI, myocardial infarction. (From Albert CM, Stevenson WG: Cardiovascular collapse, cardiac arrest, and sudden cardiac death, in Jameson JL et al (eds). Harrison's Principles of Internal Medicine, 20th ed. New York, NY: McGraw-Hill; 2018.)