Cardiac Arrest on the NREMT Paramedic Exam: CPR Quality, Rhythm Decisions, and ROSC

Where cardiac arrest sits on the Paramedic test plan

On the National Registry Paramedic Certification Examination, cardiac arrest belongs to Cardiology & Resuscitation, which is 10–14% of the exam and samples assessment, pathophysiology and management. Arrest scenarios can also carry Clinical Judgment steps, a domain worth 34–38%, but the test plan does not say how many arrest items appear in either domain. These are the Paramedic test plan's domains; the EMT exam uses a different blueprint.

Everything below follows the 2025 AHA Guidelines for CPR and Emergency Cardiovascular Care, with each recommendation's class (COR) and level of evidence (LOE) where the AHA prints them. Your local protocols and medical director decide real patient care.

Adult cardiac arrest as a chain of decisions

Described in words rather than as an algorithm chart, an adult arrest on the NREMT Paramedic exam moves through these decision points:

1. Pulse and compressions. Check a pulse when an organized rhythm or other signs suggest ROSC, keeping the check to 10 seconds or less. Avoid unnecessary pulse checks for obvious VF or asystole and minimize every interruption.
2. Shockable or not. Defibrillation treats tachyarrhythmias that need a shock, such as ventricular fibrillation (VF) or pulseless ventricular tachycardia (pVT) (COR 1). A biphasic waveform is preferred (2a), single shocks are preferred to stacked shocks (2a), and the energy for later shocks follows the manufacturer's instructions for that waveform (2a). Sustained polymorphic VT in an adult gets immediate defibrillation (COR 1).
3. Vascular access. Try IV access first (COR 1, LOE A). Intraosseous access is reasonable if IV attempts fail or are not feasible (2a, LOE A).
4. Epinephrine. Giving it is recommended in adult cardiac arrest (COR 1). The rhythm sets the timing: as soon as feasible for a nonshockable rhythm, and after initial defibrillation attempts have failed for a shockable one (2a for each). The Part 9 table calls epinephrine 1 mg every 3 to 5 minutes reasonable for adults in cardiac arrest (2a).
5. Antiarrhythmics. Amiodarone or lidocaine may be considered for VF or pVT that does not respond to defibrillation (2b). Routine calcium and routine sodium bicarbonate are not recommended in adult cardiac arrest.
6. Advanced airway. If placing one would interrupt compressions, defer it until the patient fails to respond to initial CPR and defibrillation or has ROSC (COR 1). In out-of-hospital arrest, a supraglottic airway can be acceptable where intubation success is low or training opportunities are few (2a).
7. Tube confirmation. Continuous waveform capnography, together with clinical assessment, is the most reliable way to confirm and monitor endotracheal tube placement (COR 1).
8. ETCO2 as a signal. An abrupt rise in end-tidal CO2 during compressions may indicate ROSC. A sudden increase of more than 10 mmHg suggests it, though ROSC can occur with smaller rises. ETCO2 should never be used by itself to end resuscitation.

The one amount on this page, the adult epinephrine dose and interval in step 4, is quoted from the 2025 AHA Part 9 table. Doses, energy settings and when to stop resuscitation come from your protocols and medical director.

CPR quality numbers and their conditions

A rate of 10 breaths per minute also applies during adult CPR once an advanced airway is in place, with continuous compressions. Without an advanced airway, use the appropriate compression-to-ventilation cycle. The presence of a pulse and the airway setup both matter.

Team roles, leadership, and staying on scene

The 2025 guidelines add recommendations about who is on the team. For out-of-hospital arrest, it is reasonable to include at least one member with advanced cardiac life support training and to assign clear roles with enough people to fill them (2a for each). Leadership items can turn on the numbers in the table above, such as when to swap compressors and how long a pause may last.

The free mixed set includes a Clinical Judgment item where a team leader sees compression depth falling late in a two-minute cycle. Once the switch interval and the pulse-check limit are solid, check the compressor-switch leadership item in 20 mixed NREMT Paramedic questions →.

Three more 2025 points shape scene decisions:

• Resuscitate where you are. Ongoing resuscitation on scene is reasonable in most cases, rather than early transport (2a). Because that means more on-scene terminations, the AHA recommends training EMS in death notification (COR 1). When to stop follows your local protocol.
• Mechanical CPR is not routine. Routine use of mechanical CPR devices is not recommended (3: No Benefit). A device may be considered when high-quality manual CPR cannot be maintained or for crew safety, such as during transport (2b).
• Debrief. Immediate (hot) and delayed (cold) debriefing are reasonable ways to improve the system (2a).

A worked arrest case, from first rhythm to ROSC

The patient below is fictional. Each step names the Clinical Judgment step it exercises.

Scene. A 52-year-old man is found unresponsive at home. His partner is doing compressions. You find no breathing and no definite pulse within 10 seconds (recognize cues), so compressions continue while the pads go on. The monitor shows a nonshockable rhythm (analyze cues). Your partner starts an IV, and epinephrine goes in as soon as feasible (take action).

Two minutes later. The rhythm check shows VF. The crew shocks once and resumes compressions immediately. Ventilation continues by bag-mask, and the advanced airway waits, because placing it now would interrupt compressions. When the patient has not responded to the initial CPR and shocks, an endotracheal tube goes in, and continuous waveform capnography confirms it.

A change in the numbers. During compressions, ETCO2 climbs abruptly from the low teens into the mid-30s with no change in technique. The working hypothesis is ROSC (define hypothesis), and the next rhythm check shows an organized rhythm with a pulse (evaluation).

After ROSC. The patient does not respond to voice. The 2025 guidelines recommend a 12-lead ECG after ROSC (COR 1) and a temperature between 32 °C and 37.5 °C for adults who do not respond to verbal commands (COR 1). They name no specific vasopressor for low blood pressure after arrest (2b), so pressure support follows protocol. If the 12-lead shows STEMI in a comatose patient after ROSC, the 2025 ACC/AHA acute coronary syndrome guideline says EMS should preferentially take the patient to a primary PCI center. The 12-lead ECG and STEMI guide covers that pathway.

The free set has a post-scene item on what to assess first after ROSC. When the sequence above makes sense, try the post-ROSC 12-lead item in a mixed NREMT Paramedic set →.

Where pediatric cardiac arrest differs

Pediatric items are integrated across the Paramedic clinical domains, and the 2025 pediatric rows differ from the adult ones in ways that make good distractors:

• Epinephrine timing. For infants and children with an initial nonshockable rhythm, give the first dose as early as possible (2a). With an initial shockable rhythm, it may be reasonable after 2 defibrillation attempts, or sooner if rapid defibrillation is not possible (2b).
• Blood pressure after arrest. Keep systolic and mean arterial pressure at or above the 10th percentile for age (COR 1).
• Infant compressions. Use the 1-hand or 2-thumb–encircling hands technique; 2-finger compressions are no longer recommended (COR 1), and pauses around shocks should be kept short (COR 1).

The pediatrics guide covers these with the rest of the pediatric content, and the 2025 AHA changes guide lists which arrest recommendations are new. For the rhythm side of these decisions, see the ECG rhythm guide.