PEA Medical Abbreviation: A Heart Rhythm Without a Pulse

What a PEA arrest means

A healthy heartbeat has two parts: an electrical signal and the squeeze of the heart muscle that follows it. In pulseless electrical activity the first part is still happening but the second is missing or far too weak. The monitor may show a pattern that looks almost normal, so staff confirm a PEA arrest by checking for a pulse and finding none.

Because the rhythm looks organized, PEA was once called electromechanical dissociation, meaning the electrical and mechanical parts of the heartbeat had come apart. That older term still appears in some records. Today the shorter PEA is the standard name in resuscitation guidelines and hospital code sheets.

Why PEA is not treated with a shock

Cardiac arrest rhythms fall into two groups. Defibrillation, the electric shock most people picture, works for chaotic rhythms such as ventricular fibrillation. It does not help PEA, because the heart's electrical system is already organized. The problem lies in pumping, not in rhythm.

An AED follows the same logic and will not advise a shock in PEA. Instead, teams focus on high quality chest compressions, airway support, the medicine epinephrine and, above all, finding the cause.

The Hs and Ts behind pulseless electrical activity

PEA almost always has an underlying reason, and resuscitation teams run through a memory list often called the Hs and Ts while compressions continue.

• Hs: hypovolemia (too little blood or fluid), hypoxia (too little oxygen), hydrogen ion excess (acidosis), high or low potassium, and hypothermia.
• Ts: tension pneumothorax (see PTX), cardiac tamponade (fluid squeezing the heart), toxins or overdose, and thrombosis in the lungs or the heart's own arteries.

A large pulmonary embolism and a severe heart attack both fall under thrombosis. When a reversible cause is found and treated, the heart can sometimes pump again.

Reading the PEA medical abbreviation in a code record

Code sheets are written fast and in shorthand. The table decodes the sample line shown near the top of this page.

The surgical meaning: pulmonary endarterectomy

In cardiothoracic surgery, PEA has a completely different meaning. Pulmonary endarterectomy is an operation that removes old, scarred clot material from the lining of the lung arteries. It is used for a condition called chronic thromboembolic pulmonary hypertension, in which clots that never fully dissolved keep pressure in the lungs high.

This meaning appears in surgical consults, operative reports and lung specialist letters, often next to words like CTEPH or pulmonary hypertension. If the note describes a planned operation rather than an emergency, the surgical reading is the likely one. When in doubt, the writer or the care team can confirm.

Tips for students learning PEA

PEA is often called a medical acronym even though it is said letter by letter and never as the word pea. Resuscitation courses drill it because it is common in hospital arrests and easy to miss. Learners are taught to check for a pulse whenever the monitor shows an organized rhythm in an unresponsive person, to move straight into compressions when none is felt, and to think about causes early. In documentation, record the time of each rhythm check, every dose of medicine and every change in rhythm.

Related decisions such as a DNR order shape whether resuscitation happens at all. More condition shorthand is collected on the diagnosis abbreviations page.