After restoring a pulse in a cardiac arrest patient, you begin immediate transport. While en route to the hospital, the patient goes back into cardiac arrest. You should:

When responding to a scenario where a patient goes back into cardiac arrest after a pulse has been restored, the best course of action is to begin CPR and proceed to the hospital. This approach prioritizes the immediate need for continuous circulation and oxygenation to prevent further brain and organ damage, which can quickly occur in cardiac arrest situations.

Continuing to transport the patient allows for advanced medical care to be administered promptly upon arrival at the hospital, while CPR helps maintain blood flow to vital organs. Stopping the ambulance would cause a delay in care, which can significantly impact the patient's chances of survival.

Using an AED or focusing solely on rescue breathing does not address the critical need for chest compressions in a situation where the patient has gone back into arrest. Chest compressions are essential to effectively circulate blood and oxygen until advanced medical interventions can be applied. Thus, the correct response ensures that CPR is initiated while en route to the hospital to maximize the potential for a positive outcome.