Two-rescuer CPR cycle before ventilations (adult)

Two-rescuer CPR cycle before ventilations (adult)

• A. After 15 compressions, give 2 ventilations.
• B. After 30 compressions, give 2 ventilations.
• C. After 20 compressions, give 2 ventilations.
• D. After 2 minutes of compressions, give 2 ventilations.

Answer: (B)

In two-rescuer adult CPR, the rhythm is to deliver a set of chest compressions, then provide ventilations, and repeat. The standard cycle is 30 compressions followed by 2 breaths. This approach keeps blood flowing to the heart and brain as effectively as possible while still delivering oxygen to the lungs. Why this fits best: compressions generate the pulsing blood flow that keeps organ perfusion, especially to the heart and brain. Pausing to ventilate after a complete set of compressions minimizes interruptions to that blood flow. Then the breaths provide the needed oxygen for the blood being circulated. Delivering breaths too early would cut into perfusion, and delaying breaths for too long would reduce oxygen delivery to tissues. In two-rescuer CPR, one rescuer can continue compressions while the other provides the breaths after the 30 compressions, and rescuers should switch roles to reduce fatigue over time. The other options suggest cycles that interrupt breathing too soon, or prolong the period of compressions without ventilations, which would not align with the recommended balance of perfusion and oxygenation.

In two-rescuer adult CPR, the rhythm is to deliver a set of chest compressions, then provide ventilations, and repeat. The standard cycle is 30 compressions followed by 2 breaths. This approach keeps blood flowing to the heart and brain as effectively as possible while still delivering oxygen to the lungs.

Why this fits best: compressions generate the pulsing blood flow that keeps organ perfusion, especially to the heart and brain. Pausing to ventilate after a complete set of compressions minimizes interruptions to that blood flow. Then the breaths provide the needed oxygen for the blood being circulated. Delivering breaths too early would cut into perfusion, and delaying breaths for too long would reduce oxygen delivery to tissues.

In two-rescuer CPR, one rescuer can continue compressions while the other provides the breaths after the 30 compressions, and rescuers should switch roles to reduce fatigue over time. The other options suggest cycles that interrupt breathing too soon, or prolong the period of compressions without ventilations, which would not align with the recommended balance of perfusion and oxygenation.