If you are one of the thousands of Anne Arundel residents with CPR training a new phone app can alert you to a nearby heart attack or another cardiac emergency in a public place. The county activated PulsePoint Monday, an app that will notify CPR certified residents who sign up to participate and provide the location of public automated external defibrillators — a portable device that checks the heart rhythm and can send an electric shock to the heart to try to restore a normal rhythm — they can grab on their way. “The PulsePoint program increases the chance that a CPR trained bystander who may be closer than a first responder can take action to save a life,” Fire Chief Allan Graves said at a news conference launching the system at Anne Arundel Medical Center.