If an unresponsive patient has a pulse but is not breathing, what is the appropriate algorithm to follow?

When an unresponsive patient has a pulse but is not breathing, the priority is to ensure that the patient is receiving adequate ventilation. Supporting ventilation means providing breaths to the patient using a bag-valve-mask (BVM) or another appropriate method. This is crucial because even though the patient has a pulse, the absence of breathing can lead to hypoxia and ultimately result in cardiac arrest if not addressed promptly.

Requesting advanced life support (ALS) is also important in this scenario, as ALS providers can intervene more effectively, potentially intubating the patient or providing additional advanced interventions that may be necessary as the situation develops.

The other choices do not adequately address the immediate need for ventilation. Starting CPR would be inappropriate since the patient has a pulse. Administering Narcan is suitable only in cases of suspected opioid overdose and requires respiratory compromise as a specific condition for its use, which is not guaranteed in this context. Performing a detailed assessment could delay necessary interventions, as immediate ventilation support takes precedence to prevent further deterioration of the patient's condition.