I'm a doctor with two specialties and this is true dude. It's not perfect science, but if your heart is at fault, deep breathing increases your heart's pre-load and cough hard the after-load. It will likely give you a few minutes of gain before you arrive at the hospital or to alert the nearest emergency system.

Always if you see someone collapsed in the street and you see that they are not breathing and do not have pulse, the most important thing is give an order for someone to immediately notify the ambulance or emergency system, and to start cardiac massage at 100 massages per minute. Mouth-to-mouth breathing is no longer used many years ago. Just the massage to await the arrival of the emergency system.

If you're in a place that has an automated cardioverter defibrillator, it can also be ordered and a second person can quickly read its instructions and use it. Usually in cinemas, shopping malls, airports, there is always one.

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