To attend to an injured person with a **cardiorespiratory arrest**, it is essential to perform **cardiopulmonary resuscitation (CPR)**. This technique is crucial when a person is not breathing normally, which indicates that their heart may have stopped functioning.

- **Cardiopulmonary resuscitation (CPR):**
- **Chest compressions:** Place both hands with fingers interlocked on the injured person's chest. With elbows extended, push up and down at a rate of approximately 100 compressions per minute.
- **Mouth-to-mouth ventilations:** After every 30 compressions, perform 2 mouth-to-mouth ventilations to introduce air into the injured person's lungs.


- **Continuity:** It is important to continue CPR until emergency services arrive to ensure that the injured person receives professional medical attention as soon as possible.

**Mouth-to-mouth resuscitation** alone is not sufficient, as it does not include the necessary chest compressions to maintain blood circulation. **Cardiological resuscitation** is not a term used in first aid to describe this technique. Therefore, the correct option is **cardiopulmonary resuscitation**.