For each cycle of CPR, you should perform 30 chest compressions followed by 2 rescue breaths. This cycle is repeated continuously until the person recovers or emergency help arrives

. Key details include:

• Compressions should be at a rate of 100 to 120 compressions per minute.
• Compressions should be about 5 to 6 cm (2 to 2.5 inches) deep for adults.
• After 30 compressions, give 2 rescue breaths , each lasting about 1 second and enough to make the chest rise.
• Continue alternating 30 compressions and 2 breaths until help arrives or the person recovers

This 30:2 compression-to-breath ratio applies to adults and most situations, including children and infants when performed by a single rescuer, though for two rescuers on children and infants, a 15:2 ratio may be used

. If the rescuer is untrained or unable to perform rescue breaths, compression-only CPR (continuous chest compressions without breaths) is recommended for adults

. However, for children, infants, or cases caused by respiratory issues (like drowning), rescue breaths are important