Final answer:
In CPR, one rescuer gives 2 breaths after every 30 chest compressions, and two rescuers use the same breaths to compressions ratio. Training is essential for proper application, and CPR should continue until professional assessment.
Step-by-step explanation:
When performing CPR (cardiopulmonary resuscitation), the current guidelines emphasize the importance of high-quality chest compressions over artificial respiration. For adult CPR with one rescuer, provide 2 breaths after every 30 chest compressions. When two rescuers are involved, the one performing the breaths does so at a ratio of 2 breaths after every 30 chest compressions provided by the other rescuer. CPR for infants and children is slightly different, involving different compression-to-breath ratios.
It's critical to note that proper training in CPR is essential to avoid causing harm. CPR is generally continued until the patient gains spontaneous circulation or is declared deceased by medical professionals. Moreover, rescuers should attempt resuscitation even in cases of drowning, especially in cold water, as recovery is possible due to the protective effect of cold on the brain.