You're trying to resuscitate a casualty who isn't breathing. For how long should you continue compressions if they haven't started breathing again? You're trying to resuscitate a casualty who isn't breathing. For how long should you continue compressions if they haven't started breathing again?

• Possible answers:

   
• A. Give up if you think they're dead
• B. Keep trying for up to two minutes
• C. Until medical help arrives and takes over
• D. Keep trying for up to four minutes