Compression only (hands-only resuscitation) CPR is a technique that involves chest compressions without artificial respiration. It is recommended for the untrained rescuer or those who are not competent in conventional CPR as it is easier to perform and instructions are easier to give over the phone.
When a person goes into cardiac arrest because of a problem with the heart, that individual normally has more oxygen in the body. So rescue breaths aren’t as vital to survival and the emphasis is on trying to keep blood pressure high enough to allow perfusion of the vital organs. However, if cardiac arrest is secondary to trauma, drowning or a problem not directly related to heart function and for children, then it is advisable to do standard CPR that includes rescue breaths. In those cases, getting oxygen into the system is crucial.
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