Tualatin Valley Fire & Rescue hopes you will help them save lives. If you know CPR, that is.

The emergency response agency will send details of 9-1-1 calls to Pulse Point, a free app for smartphones, like the iPhone. Once you downtown the app and adjust settings to see TVF&R calls, you can keep track of incidents that could benefit from your life saving skills. The app will ask if you know CPR, if you respond in the affirmative, you will be notified when someone suffering cardiac arrest is within a quarter-mile radius.

"Each passing minute a cardiac arrest patient's chances of survival decrease by 10-percent if there is not defibrillation," said Karen Eubanks, a spokeswoman for TVF&R. That's why the app also notifies the user of the closest AED's, defibrillators that give users step-by-step instructions to zap a cardiac arrest patient back to life.

Additional details on the app are on the Pulse Point website.

Details on hands-only CPR can be found on TVF&R's website.