“…These include pulmonary embolus, AMI, hypovolemia, hypoxia, cardiac tamponade, tension pneumothorax, preexisting acidosis, drug overdose, hypothermia, and hyperkalemia. Cardiac pacing for bradyarrhythmic or asystolic arrests is usually ineffective (345), but reversal of hypoxemia, acidosis, or electrolyte imbalances may help in some instances. Epinephrine (1.0 mg intravenously every 3 to 5 min) is commonly used in an attempt to elicit spontaneous electrical activity or increase the rate of a bradycardia.…”