More than 350,000 people had sudden cardiac arrest outside of a hospital in 2017. Those who received CPR were two to three times more likely to survive. It is a moment everyone hopes they never experience, but it could happen at any time: finding a person in cardiac arrest unconscious and nonresponsive.

The five steps you should go through to save a life.

Step No. 1: The first thing you should do is make sure the scene is safe before approaching the person

Step No. 2: Is to call 911 and get help on the way

Step No. 3: Check for breathing and a pulse. If the person is not breathing and has no pulse

Step No. 4: Chest Compressions.

Using both hands, push down on the person's sternum about 2-2. Typically, you want to go to 100 to 120 beats per minute. And the most common song people think of when they perform CPR is "Stayin' Alive" by the Bee Gees. After about 30 compressions.

Step No. 5: Rescues breaths.

"You want to ensure that their airway is open before you administer a breath to them," Moeckly says. "So you'll tilt their head and then breathe into their mouth a full, deep second, take a deep breath, (and) breathe into their mouth for another deep second."

For years, performing CPR meant checking the airway and doing mouth-to-mouth resuscitation in addition to chest compressions. Experts now advise chest compressions alone can keep the heart pumping and maintain blood flow for a few minutes until emergency workers arrive.

Hands-Only CPR

Hands-only CPR is part of an effort to get more people to take action. The steps are: Call 911 and immediately begin chest compressions when someone is unconscious and having difficulty breathing. If you need guidance, an emergency operator can explain what to do. Using a cell phone, it may be possible to perform CPR and speak with the 911 dispatcher at the same time.

Compression-Only CPR

Compression-only CPR is best suited for adults and teens. You should press hard and fast in the center of the chest, down at least 2 inches with the full weight of your body. In general, people do not push hard enough because they are afraid. But "you're pumping blood. You're replacing the heartbeat.

The optimum rate of compression is 100 to 120 beats per minute. It may come naturally, but if you need help gauging it, thinking of a song may help. Moeckly says, from there, the best thing you can do is to repeat the process until the person wakes up or help arrives.