What immediate action should a paramedic take when encountering a patient who is unresponsive?

When encountering a patient who is unresponsive, initiating CPR is the critical first step, especially if there is no indication of a pulse. The rationale behind this action is that unresponsiveness often indicates a lack of adequate perfusion; thus, starting CPR helps to maintain blood flow to vital organs, particularly the brain and heart, until advanced medical assistance arrives or until the patient shows signs of recovery.

It is essential to recognize that in situations of unresponsiveness, especially if the patient's airway is obstructed or they are not breathing adequately, prompt action is crucial to prevent irreversible damage from lack of oxygen. CPR serves this purpose by providing chest compressions and, if possible, ventilations to facilitate circulation and oxygenation.

While checking for a pulse or calling for additional help are important steps, they can delay immediate lifesaving interventions. Administering oxygen may be appropriate but is secondary to the need to initiate CPR, as it does not address the immediate circulatory compromise presented by an unresponsive patient. Time is of the essence in these scenarios, making prompt CPR the most crucial first response.