PEA: Without a Pulse

What PEA Means

PEA stands for Pulseless Electrical Activity. The monitor shows organized (or semi-organized) electrical activity, but the patient has no palpable central pulse — so that electricity is not producing effective cardiac output. The heart may still be “trying” electrically; the pump is not delivering perfusion to the brain and organs.

In the truck this is a condition, not a single “PEA rhythm strip.” You can have sinus bradycardia with PEA, an idioventricular rhythm with PEA, junctional rhythm with PEA, or other morphologies with PEA. The shared feature is always: organized activity + no pulse.

Contrast with other arrest states so the team stays aligned: VF/pVT are shockable chaotic or organized ventricular tachycardias without a pulse; asystole is flatline (after verification); PEA is organized non-shockable activity without a pulse. Wrong naming leads to wrong pathways (for example, shocking PEA or skipping CPR).

Street Context

Monitors create false reassurance. A clean-looking complex does not equal a heartbeat that fills the brain. If you name only “sinus brady at 40” and skip the pulse check, the team may under-treat a true arrest — starting pressors for “bradycardia” while the patient is actually dead without CPR.

Prehospital reality: noisy scene, motion artifact, weak femoral pulses, gloves, cold extremities, and time pressure. Still force the sequence: look at the patient → feel for a central pulse during the appropriate brief check → name morphology + pulse status. SpO₂ pleth and automatic BP cuffs lie when perfusion is terrible; they do not replace a pulse check.

During CPR, pulse checks are short and coordinated with rhythm checks per your arrest protocol. Do not extend pauses while debating whether the complex “looks good.”

How to Name It for the Team

Communicate in two parts so ACLS and documentation stay aligned:

• Morphology first: “Sinus brady at 36,” “slow wide complex ~30,” “organized narrow complex at 70.”
• Pulse status second: “…with PEA — resume CPR” or “…with a weak femoral pulse — not PEA.”

Example radio/partner language: “Organized sinus brady, no pulse — PEA. Continuing high-quality CPR, epi timing per protocol, working reverse causes.”

Key Points for Paramedics

• PEA ≠ a unique waveform. Do not wait for a special “PEA look” on the screen.
• Always confirm pulse with organized activity — carotid or femoral as trained; do not rely on SpO₂ pleth, NIBP, or “it looks perfusing” alone.
• Treat as arrest when pulseless: high-quality CPR (depth, rate, full recoil, minimal pauses), airway/ventilation per protocol, epinephrine timing per protocol, and search for reversible causes.
• Do not call PEA if there is a pulse — that is a living patient with a rhythm problem (for example symptomatic bradycardia pathway), not PEA. Weak pulse still means “has a pulse” — manage shock/bradycardia pathways, not the PEA algorithm.
• ROSC checks matter: sudden EtCO₂ rise, spontaneous movement, or organized rhythm with a pulse means reassess — do not keep doing CPR on a patient who has output.

Reversible Causes — Field Clues (Hs/Ts Education)

Lists only help if you attach them to history, exam, and scene. Use them as a mental checklist while CPR continues — not as a reason to stop compressions for a long brainstorm.

• Hypoxia — airway obstruction, aspiration, drowning, opioid overdose context, failed oxygenation. Fix ventilation/oxygenation aggressively.
• Hypovolemia / hemorrhage — trauma, GI bleed, AAA picture, pregnancy-related bleeding, dialysis no-show dehydration. Control external bleed; fluid/blood products only per protocol.
• Hydrogen ion (acidosis) — prolonged downtime, DKA context, toxic alcohols; usually addressed by ventilation and treating root cause, not “push bicarb by default.”
• Hypo/hyperkalemia — ESRD, missed dialysis, crush, certain tox; wide complex, sine-wave-ish strips, history. Follow hyperK/arrest protocols when authorized.
• Hypothermia — outdoor exposure, cold water; modify expectations and handle gently per protocol; do not declare death casually in severe hypothermia without local rules.
• Tension pneumothorax — trauma, high bagging pressure, unilateral findings, obstructive shock. Needle decompression only if trained and protocol-indicated.
• Tamponade — penetrating chest trauma classic; equal breath sounds, obstructive shock picture. Rapid transport; field options limited.
• Toxins — empty bottles, bystander history, track marks, industrial exposure. Antidotes only per protocol (for example opioid → naloxone context when appropriate).
• Thrombosis (MI / PE) — ACS history, sudden collapse with risk factors for PE. Destination and reperfusion pathways matter when ROSC is achieved.

Field Pitfalls

• Pulse check too short, only peripheral, or during active CPR artifact so you “feel” a pulse that is not real.
• Confusing PEA with asystole or fine VF — different pathways (shock vs no shock).
• Fixating on pressors, advanced airway, or the perfect Hs/Ts monologue while CPR quality and pause discipline collapse.
• Calling PEA on a patient who still has a pulse because BP is low or skin is mottled.
• Assuming “normal-looking” QRS means the heart is fine — electrical activity is not mechanical output.

Practice

In CardioStrip, open organized rhythms and force the check: “If this patient had no pulse, what would I call this condition for my partner?” Then practice the opposite: “If they had a weak femoral pulse, what pathway am I on instead?”

Sources & Further Study

• ACLS educational framing of PEA / organized rhythm without pulse and reversible causes.
• Your local cardiac arrest protocol, epinephrine timing, and medical direction.