The correct option is D. Hands-only CPR was designed for those who are not trained or feel uncomfortable delivering mouth-to-mouth breaths. It doesn't replace traditional CPR.
Hands-only CPR is for:
- Not trained people. That is to say, people who do not know when and how to deliver mouth-to-mouth breaths. They do not know the interval between compressions and breaths or that the nose should be blocked to perform mouth-to-mouth breaths in adults.
- If the person is uncomfortable, or a patient is underage, and the parents do not allow for mouth-to-mouth breaths, the person should perform hands-only CPR.
Hands-only is not as effective as traditional CPR, but it still can save lives. Especially if before performing this technique, we open the airways by tilting the patient's head backward so that the mouth is open. It will not increase oxygenation as traditional CPR, but it is still useful.
In conclusion, hands-only CPR is for not trained people or people who are uncomfortable performing mouth-to-mouth breaths.
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