From the Guidelines
Pacing is not generally recommended for pea arrest, except in rare cases of extreme bradyarrhythmias or trifascicular block where P waves are seen. The prognosis for non-VF/VT rhythms, including pea arrest, is generally less favorable, with an overall survival rate of about 10-15% of the survival rate with VF/VT rhythms 1. The use of pacing in asystole is questionable, and its value is limited to specific situations where reversible causes can be identified and treated.
Instead of pacing, the focus should be on high-quality cardiopulmonary resuscitation (CPR), advanced airway management, oxygenation, and ventilation, along with the administration of adrenaline/epinephrine every 3 minutes 1. The detection and treatment of reversible causes, such as those outlined in the "H's and T's" framework, are crucial in the management of pea arrest.
In some cases, external cardiac percussion, also known as "fist" or "thump" pacing, may be used to generate QRS complexes with an effective cardiac output, particularly when myocardial contractility is not critically compromised 1. However, this should not delay the initiation of conventional CPR, and its use should be limited to situations where pacing is not immediately available.
The key to managing pea arrest is to maintain excellent CPR while rapidly identifying and addressing the underlying cause, rather than relying on pacing as a primary intervention. Resuscitation efforts should continue for at least 20-30 minutes from the time of collapse, unless there are overwhelming reasons to believe that resuscitation is likely to be futile 1.
From the Research
Pulseless Electrical Activity (PEA) Arrest
- PEA accounts for up to 25% of sudden cardiac arrest, making it an essential skill for emergency medicine physicians to recognize and care for this condition 2.
- Management of PEA arrest in the emergency department centers on Advanced Cardiac Life Support (ACLS) algorithms and the identification and treatment of potentially reversible causes 2.
Causes and Diagnosis of PEA
- The American Heart Association and the European Resuscitation Council Guidelines for Resuscitation suggest contributing factors that should be considered when diagnosing PEA, including massive pulmonary embolism (PE) 3, 2.
- Diagnosis of PEA can be challenging, especially in the prehospital setting, and often requires the use of diagnostic tools such as ultrasonography and point-of-care testing 4.
- Ultrasonography has become a valuable asset in detecting underlying causes of PEA, and various protocols have been proposed, although further research is needed to compare their feasibility and effect on patient survival 4.
Treatment and Outcomes of PEA
- Systemic thrombolytic therapy is indicated in cardiac arrest due to known or presumed massive pulmonary embolism 2.
- A novel peptide, TAT-PHLPP9c, has shown potential as an intra-CPR pharmacologic agent, resulting in improved survival with full neurologic function after sudden cardiac arrest in a swine model of PEA 5.
- The transition intensities from PEA to return of spontaneous circulation (ROSC) vary depending on the presentation of PEA, with higher transition intensities observed for secondary PEA after ventricular fibrillation/tachycardia (VF/VT) or after ROSC 6.