ROSC & Post-Arrest Care

Why this matters

Pulses are back. That is not the end of the call. This is a new unstable patient, and re-arrest is common. Check the airway, the oxygen saturation, and the blood pressure. Do not stop care because the crew got pulses. Do not hyperventilate. Bagging too fast can drop the blood pressure. Then get a 12-lead, prevent fever, and choose the destination. Leave the pads on.

Clinical sequence

1. Confirm a real pulse. Say the ROSC time out loud.
2. Check the airway. Do not hyperventilate. Adjust oxygen to the sat when the number is reliable.
3. Treat blood pressure and perfusion per protocol. Leave the pads on.
4. Get a 12-lead. If it shows a STEMI or a concerning pattern, say so and go to a PCI hospital.

Recognizing ROSC

• An organized rhythm with a palpable pulse. Confirm the pulse carefully.
• A sudden sustained rise in end-tidal carbon dioxide (EtCO2) can mean blood flow through the lungs is improving. Still confirm a pulse per protocol.
• Spontaneous movement, breathing effort, and better color are helpful clues. They do not prove ROSC by themselves.

Post-arrest priorities

1. Airway and ventilation. Confirm tube placement. Do not hyperventilate. Keep 100% oxygen until the sat can be measured reliably, then titrate to about 90–98% SpO2. Avoid hypoxia and too much oxygen. Ventilate toward a normal CO₂ range, about 35–45 mmHg, using EtCO2 as your field guide.
2. Blood pressure and perfusion. Treat hypotension per protocol, with fluids or pressors only if you are authorized. Hospitals often aim for a MAP (mean arterial pressure) of 65 mmHg or more. You do not have an arterial line. The automatic cuff in a moving ambulance is noisy. Use the whole picture: pulse quality, mental status, skin, the EtCO2 trend, and the blood-pressure number your protocol lists.
3. 12-lead ECG when you can get one. A STEMI (ST-elevation MI) pattern drives the choice of a PCI (cath-lab) hospital.
4. Treat reversible causes that are still present. Use the Hs and Ts as a short checklist. Do not turn the list into a speech.
5. Glucose. Do not leave the patient hypoglycemic. Treat it per protocol. Marked high glucose is a hospital concern too.
6. Temperature. Prevent fever. That is the field action. Do not pack the patient in ice to 33 °C in the field. Induced hypothermia versus fever prevention is a hospital and system decision.
7. Re-arrest readiness. Leave the pads on. Keep epinephrine and airway gear ready. Keep the monitor on.
8. Destination and notification. Go to a PCI-capable hospital when indicated. Give a clear radio report.

Key points

• Pulse checks must be real. Do not call ROSC on artifact.
• EtCO2 is an adjunct. It does not replace a pulse check or a patient assessment.
• Say it: “ROSC at [time], BP, EtCO2, 12-lead, destination.”
• Talk with the family, but do not stop monitoring for a long conversation.

Common errors

• Taking the pads off to tidy up before the hospital.
• The crew bags faster than 20 breaths a minute after ROSC.
• Missing a STEMI because nobody got a 12-lead.
• A long scene time after ROSC with no purpose.

Practice

Related: PEA: Without a Pulse, Asystole vs Fine VF, 12-Lead STEMI Recognition.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

• AHA 2025 Part 11: Post–Cardiac Arrest Care
• NASEMSO National Model EMS Clinical Guidelines (2022) — post-ROSC support, 12-lead, and destination themes for EMS
• Once the sat can be measured reliably, avoid both hypoxia and too much oxygen (about 90–98% SpO2), aim for a normal CO₂ range, treat hypotension, get a 12-lead, and prevent fever. Follow your ROSC protocol.