What is the immediate response for someone who has no pulse?

Administering CPR is the immediate response for someone who has no pulse because it is a critical lifesaving technique used to restore circulation and maintain blood flow to the brain and vital organs. When a person suffers from cardiac arrest, their heart stops beating effectively, leading to a lack of blood flow. Performing CPR involves chest compressions that help to manually pump blood through the body, which can often keep a person alive until professional medical help arrives or an automated external defibrillator (AED) can be used.

Calling for help is important but should typically occur simultaneously with starting CPR or immediately afterward. While providing oxygen can be beneficial, it is not effective if there is no circulation to deliver the oxygen where it's needed. Checking for injuries is also essential, but it should not take precedence over the immediate need to initiate CPR when someone is unresponsive and shows no pulse. Thus, beginning CPR as soon as possible is crucial in these scenarios to increase the chances of survival.