What is the compression to ventilation ratio for a single rescuer performing CPR on an adult?

In the context of Basic Life Support (BLS) for adults, the correct compression to ventilation ratio for a single rescuer performing CPR is 30:2. This means that for every 30 chest compressions performed, the rescuer should give 2 rescue breaths. This ratio is designed to optimize blood circulation during cardiac arrest while ensuring that the patient receives adequate oxygenation through the rescue breaths.

The rationale behind the 30:2 ratio is based on research indicating that performing more compressions consistently increases the chances of survival, while still incorporating ventilation to help maintain oxygen levels. This balance is crucial in ensuring effective cardiopulmonary resuscitation, especially when an advanced airway is not in place.

Proper technique during compression is essential, where chest compressions should be performed at a rate of approximately 100 to 120 compressions per minute and at a depth of at least 2 inches. Following every 30 compressions with 2 breaths provides a systematic approach that maximizes the likelihood of resuscitation in an emergency setting.