When assessing circulation in an awake patient, you start with the radial pulse because it’s the most accessible and least invasive way to get a quick read on perfusion. Palpating at the wrist lets you rapidly gauge heart rate, rhythm, and the presence of adequate blood flow to the extremities without moving or disturbing the patient. It also supports a quick bilateral comparison to spot any asymmetry. If the radial pulse is palpable and normal, you have a good initial indication that peripheral perfusion is adequate. If not, you can then move on to other pulses that reflect central or broader circulation, such as the carotid or brachial, as needed.

In the history, E stands for Events leading up to the incident. This part asks what happened before the event began—what the patient was doing, what actions were taken, who witnessed it, the sequence of events, and any factors that might have contributed. Understanding these details helps you infer potential causes, exposures, or mechanisms of injury and guides what to look for next in the assessment. Emergency contact is not part of this acronym; that information is kept separate as a contact detail. Environmental factors aren’t the designated meaning for this letter in the standard mnemonic, though scene conditions can influence the case, they’re not the specific category represented by E here. External injuries would be described under Signs and Symptoms, not the Events category.

In this situation you’re aiming to provide effective ventilation without overdoing it. For an adult who isn’t ventilating adequately, the best approach is about 10–12 breaths per minute, using 100% oxygen if available. That’s roughly one breath every 5–6 seconds, which delivers enough air to meet metabolic needs while avoiding excessive pressures that can raise intrathoracic pressure, cause gastric inflation, or reduce venous return. The slower rate (6–8 breaths per minute) would under-ventilate and fail to sustain oxygenation, the faster rates (20–30 or 40–60 breaths per minute) can lead to hyperventilation and its complications. Pairing the rate with high oxygen content maximizes the effectiveness of each breath during bag-valve-mask ventilation.

When an adult is unresponsive with no pulse, the priority is to restore circulation as quickly as possible. Start high-quality chest compressions immediately to generate blood flow to the brain and heart while you activate emergency services and obtain an automated external defibrillator. Early CPR buys time for vital organs, and defibrillation should be delivered as soon as the AED is ready if the rhythm is shockable. Delaying CPR to check for a pulse can waste precious seconds and is often unreliable, since distinguishing a pulse in an unresponsive person is difficult. Giving rescue breaths alone won’t circulate blood, which is why compressions are essential even if you’re unsure about breaths. Open the airway as part of the process, but do not let that step delay compressions; if you’re trained, continue with the recommended pattern (compressions with breaths). If you’re not trained to give breaths, provide Hands-Only CPR to keep the blood moving until help arrives.