Otis Singleton
Pulseless electrical activity (PEA) is a clinical condition characterised by unresponsiveness and the absence of a palpable pulse, despite the presence of sufficient electrical discharge. It is a significant cause of mortality, especially in hospitalised, elderly patients, and is found initially in about 20% of out-of-hospital cardiac arrests and about 50% of in-hospital cardiac arrests. Treatment for PEA involves identifying and treating the underlying cause, which could be one of the H's and T's of ACLS, and may include pharmacological therapy, such as epinephrine and atropine, or surgical procedures, such as pericardiocentesis and thoracotomy.
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What You'll Learn
Cardiopulmonary resuscitation (CPR)
When performing CPR on a patient with PEA, it is standard practice to rely on ETCO2 readings instead of pulse checks. Pulse detection may be challenging, especially in patients with conditions like morbid obesity or severe peripheral vascular disease. Therefore, relying on ETCO2 readings can provide more accurate information to guide treatment.
CPR for PEA involves high-quality chest compressions, airway management, and appropriate medication therapy. Epinephrine is often administered during CPR for PEA, with 1-mg doses given intravenously or intraosseously every 3-5 minutes. Atropine may also be considered, especially if the underlying rhythm is bradycardia with a heart rate below 60 bpm associated with hypotension. However, it is important to note that atropine may cause pupillary dilation, impacting the assessment of neurological function.
In addition to medication therapy, pericardiocentesis and emergent cardiac surgery may be life-saving procedures for selected patients with PEA. These procedures should be performed by experts and supported by appropriate services. Patient selection is crucial, as cardiopulmonary bypass, for instance, is only suitable for patients with easily reversible etiologies of cardiac dysfunction.
Overall, the treatment of PEA requires a comprehensive approach, including CPR, medication administration, and, in some cases, surgical interventions. The specific treatment plan may vary depending on the underlying cause and the patient's condition.
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Intravenous medication
Pulseless electrical activity (PEA) is a clinical condition characterised by unresponsiveness and the absence of a palpable pulse, despite the presence of sufficient electrical discharge. In other words, there is electrical activity, but it is insufficient to generate a pulse and supply blood to the organs. PEA is a form of cardiac arrest and can be identified by the presence of organised electrical activity on a monitor without a detectable pulse.
When treating a patient with PEA, the first step is to initiate cardiopulmonary resuscitation (CPR) to maintain cardiac output while attempting to identify and address the underlying causes. The identification and correction of the causes of PEA should be a high priority, and healthcare providers should treat the patient's symptoms rather than relying on the ECG readout alone.
Regarding intravenous (IV) medication, epinephrine and atropine are commonly used in resuscitative pharmacology for PEA. Epinephrine should be administered in 1-mg doses intravenously every 3-5 minutes during PEA arrest. Higher doses of epinephrine have not shown improved survival or neurological outcomes in most patients. However, certain patient populations, such as those who have overdosed on beta-blockers or calcium channel blockers, may benefit from higher doses.
Atropine may be administered when the underlying rhythm is bradycardia (heart rate <60 bpm) associated with hypotension. It is given in 1 mg doses intravenously every 3-5 minutes, up to three doses. It is important to note that atropine may cause pupillary dilation, which can affect the assessment of neurological function.
In specific situations, such as pre-existing metabolic acidosis, hyperkalemia, or a tricyclic antidepressant overdose, sodium bicarbonate (1 mEq/kg) may be considered. However, its routine use is generally not recommended due to limited evidence of its effectiveness.
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Underlying causes
Pulseless electrical activity (PEA) is a clinical condition characterised by unresponsiveness and the absence of a palpable pulse, despite the presence of sufficient electrical discharge. It is a significant cause of mortality, especially in hospitalised, elderly patients.
The underlying causes of PEA can be remembered using the H's and T's of ACLS. These include:
- Hypovolaemia, which should be treated aggressively, especially in patients with active bleeding.
- Hypoxia, which is a change in vital signs that healthcare professionals should monitor to prevent cardiac arrest.
- Hypothermia, which can be treated with rewarming techniques.
- Hyper/hypocalcaemia, which can be treated with calcium chloride.
- Hyper/hypokalaemia, which can be treated with sodium bicarbonate.
- High/low cardiac output, which can be caused by conditions such as pulmonary embolism, myocardial infarction, or cardiac tamponade.
- Tension pneumothorax, which can be treated with a chest tube or needle decompression.
- Toxins, such as poisoning, which can be treated with antidotes or supportive care.
- Thrombosis, which can be treated with anticoagulants or thrombolytics.
It is important to identify and treat the underlying causes of PEA to prevent further deterioration and improve patient outcomes.
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Toxicology and surgery consults
Pulseless electrical activity (PEA) is a form of cardiac arrest where the electrocardiogram shows a heart rhythm but no pulse is produced. It is a "nonshockable" heart rhythm, meaning a defibrillator will not correct it. PEA is often a common part of the normal dying process and has a poor prognosis for patients.
Surgery consults are also crucial in treating PEA, as certain procedures can be lifesaving. For instance, pericardiocentesis, or cardiac tamponade, can be performed to relieve pressure on the heart. In some cases, cardiothoracic surgery may be necessary, especially if the patient has a large pulmonary embolus. In patients with chest trauma, a thoracotomy may be performed if adequate expertise is available.
It is important to note that the treatment for PEA involves addressing the underlying cause, and surgery and toxicology consults play a vital role in identifying and managing these causes. Early detection and intervention are critical in improving the chances of survival for patients with PEA.
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Electrocardiography (ECG/EKG)
Pulseless electrical activity (PEA) is a form of cardiac arrest where the heart has electrical signals, but they are not strong enough to pump blood properly. This means that the heart is electrically active, but the muscle isn't reacting to it, resulting in no blood being pumped and the absence of a pulse. This condition can be detected using an electrocardiogram (ECG or EKG) and is characterised by the presence of electrical activity in the heart, but without a pulse.
An ECG is a diagnostic test that can detect the electrical current in the heart. In the case of PEA, the ECG will show a heart rhythm that should produce a pulse, but does not. This is because the electrical activity is present, but it is not sufficient to generate a pulse. The ECG will also help distinguish PEA from other causes of cardiac arrest, such as asystole (flatline) or ventricular fibrillation, which have different electrical activity patterns.
The ECG patterns seen with cardiac arrest include ventricular tachyarrhythmia or VF, ventricular asystole, and PEA. During resuscitation, it is common to observe two or even all three of these patterns at different times. The ECG can also help identify the type of PEA, such as narrow or wide complex PEA, which has different treatment approaches.
When treating PEA, the first step is to begin chest compressions according to the advanced cardiac life support (ACLS) protocol, followed by the administration of epinephrine. CPR is vital for saving lives, both inside and outside the hospital, and can sometimes help the heart switch to a shockable rhythm, allowing for defibrillation. However, PEA itself is not shockable, and immediate CPR and epinephrine are necessary to try and restart the heart.
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