Perform a scene size-up upon entering the scene. Try to determine why the person is unconscious. Do you smell anything? Do you see any open canisters or containers that could alert you to a problem? Is there a ladder, stool, chair tipped over by the person? Are there electrical wires or other clues at a work scene? The first responder at the scene will need to look for all the clues that can help to determine what caused the emergency.
If they are unconscious and breathing, nothing will happen. If they are unconscious and not breathing, they will die.
breathing
Could be. Breathing is not a response. A person who is unconscious would be unresponsive and still breathing.
CPR should be performed if a person is unconscious and not breathing
Up to (but no longer than) 10 secs
To check for a response from an unconscious person, start by gently tapping their shoulder and asking loudly, "Are you okay? Can you hear me?" If there is no response, try to assess their breathing and pulse. If they are not breathing or do not have a pulse, begin CPR and call for emergency medical assistance immediately.
Rescue breathing is typically used when a person is unconscious and not breathing adequately or at all, regardless of whether they have a pulse. If the person has a pulse but is not breathing, rescue breaths can help provide oxygen to their lungs. However, if there is no pulse, cardiopulmonary resuscitation (CPR) should be initiated, which includes chest compressions along with rescue breaths if trained to do so. Always prioritize calling emergency services in such situations.
If a person is unconscious and electrocution is suspected, first ensure the scene is safe and turn off the source of electricity if possible. Call emergency services immediately. Check the person's breathing and pulse; if they are not breathing or have no pulse, begin CPR. Do not touch the person until the source of electricity is completely turned off to avoid becoming a victim yourself.
To look out for ambush , traffic or other physical dangers, like smell of gasoline , possibility of explosion etc.
First perform an Initial Assessment. Open the airway, Check for breathing, if there is no breathing give two rescue breaths. If the rescue breaths go in and make the chest clearly rise check for a pulse. IF there is no pulse begin CPR.
If someone has inhaled a chemical agent, immediately move them to fresh air to minimize further exposure. Call emergency services for medical assistance and monitor their breathing and consciousness. If the person is breathing and conscious, try to keep them calm and comfortable; if they are unconscious and not breathing, begin CPR if trained. Avoid leaving the person alone and provide any information about the chemical agent to emergency responders.
When a person has stopped breathing and can not breathe on his own, rescue breathing (or Mouth-To-Mouth Resuscitation) is given to try and saved the persons live (in addition to CPR and/or defibrilation).