You can skip the mouth-to-mouth breathing and just press on the chest to save a life. In a major change, the American Heart Association said Monday that hands-only CPR — rapid, deep presses on the victim’s chest until help arrives — works just as well as standard CPR for sudden cardiac arrest in adults.

Experts hope bystanders will now be more willing to jump in and help if they see someone suddenly collapse. Hands-only CPR is simpler and easier to remember and removes a big barrier for people skittish about the mouth-to-mouth breathing.

“You only have to do two things. Call 911 and push hard and fast on the middle of the person’s chest,” said Dr. Michael Sayre, an emergency medicine professor at Ohio State University who headed the committee that made the recommendation.

Hands-only CPR calls for uninterrupted chest presses — 100 a minute — until paramedics take over or an automated external defibrillator is available to restore a normal heart rhythm.

This action should be taken only for adults who unexpectedly collapse, stop breathing and are unresponsive. The odds are that the person is having cardiac arrest — the heart suddenly stops — which can occur after a heart attack or be caused by other heart problems. In such a case, the victim still has ample air in the lungs and blood and compressions keep blood flowing to the brain, heart and other organs.

A child who collapses is more likely to primarily have breathing problems — and in that case, mouth-to-mouth breathing should be used. That also applies to adults who suffer lack of oxygen from a near-drowning, drug overdose, or carbon monoxide poisoning. In these cases, people need mouth-to-mouth to get air into their lungs and bloodstream.

But in either case, “Something is better than nothing,” Sayre said.

The CPR guidelines had been…