Reversible Causes of PEA and Asystole

Introduction to Reversible Causes

The American Heart Association emphasizes that PEA and asystole are often caused by reversible conditions that can be successfully treated if identified and corrected promptly, including hypovolemia, hypoxia, hydrogen ion acidosis, and cardiac tamponade 1, 2

Bedside cardiac ultrasound should be performed immediately in PEA to accurately diagnose true PEA arrest, evaluate for reversible causes, and differentiate pseudo-PEA states with wall motion 3, 2
Point-of-care ultrasound has demonstrated high sensitivity and specificity for cardiac tamponade (100%), pulmonary embolism (100% sensitivity, 97% specificity), and myocardial infarction (86% sensitivity, 94% specificity) when performed by experienced personnel 4

Hypovolemia requires IV/IO crystalloid administration or blood transfusion for severe blood loss, as recommended by the American Heart Association 1, 4
Hypoxia demands adequate oxygenation through advanced airway management and ventilation, according to the American Heart Association guidelines 1, 4
Hydrogen ion acidosis needs identification and correction of metabolic abnormalities, as emphasized by the American Heart Association 1, 4
Hypo/Hyperkalemia requires immediate treatment of electrolyte abnormalities, particularly high potassium levels which can cause cardiac arrest, as recommended by the American Heart Association 1, 4
Tension pneumothorax requires immediate needle decompression at 2nd intercostal space, mid-clavicular line, as recommended by the American Heart Association 1, 4
Tamponade (cardiac) is treated with pericardiocentesis guided by echocardiography, according to the American Heart Association guidelines 1, 4

Do not delay treatment while searching for causes—continue high-quality CPR with minimal interruptions while systematically evaluating for reversible causes, as recommended by the American Heart Association 1, 2
Avoid prolonged interruptions in chest compressions for diagnostic procedures, as any pause reduces coronary perfusion pressure and decreases likelihood of ROSC, according to the American Heart Association guidelines 3, 5

The American Heart Association recommends beginning immediate high-quality CPR with chest compressions at 100-120/minute and depth of at least 2 inches, minimizing interruptions to maintain coronary perfusion pressure 6
The American Heart Association suggests administering epinephrine 1 mg IV/IO every 3-5 minutes as the primary vasopressor throughout resuscitation, and establishing vascular access (IV or IO if IV not readily available) for medication administration 7

The American Heart Association recommends considering thrombolysis, surgical embolectomy, or mechanical embolectomy as reasonable emergency treatment for suspected massive PE 8
The American Heart Association suggests that higher epinephrine doses may be indicated for β-blocker or calcium channel blocker overdose, and sodium bicarbonate for sodium channel blocker toxicity 8

The American Heart Association recommends against the routine use of sodium bicarbonate for PEA cardiac arrest, but suggests its use in specific indications such as sodium channel blocker toxicity 7, 8
The American Heart Association recommends against the routine administration of calcium for treatment of cardiac arrest, but suggests its use in specific indications such as hyperkalemia-induced arrest and calcium channel blocker toxicity 7, 8
The American Heart Association recommends against the routine magnesium administration for PEA arrest, but suggests its use in specific indications such as documented hypomagnesemia and torsades de pointes 7

The American Heart Association suggests that atropine is unlikely to have therapeutic benefit during PEA 7

The American Heart Association recommends considering venoarterial ECMO (VA-ECMO) early for refractory PEA with suspected reversible cause 8

The Society of Critical Care Medicine recommends monitoring for complications and optimizing hemodynamics, oxygenation, and ventilation after ROSC 9