When performing one-rescuer CPR, what is the ratio of breaths to compressions?

The correct answer reflects current guidelines for one-rescuer CPR, which instruct that the appropriate ratio of breaths to compressions is 1 breath for every 30 compressions. This method is particularly essential in ensuring proper ventilation while still maintaining effective circulation through chest compressions.

When performing CPR, the primary goal is to circulate blood and oxygenate the victim’s body. The frequent compressions provide blood flow to the vital organs, while the breaths introduce oxygen into the lungs. This 30:2 ratio focuses on maximizing compressions, which are critical for maintaining blood flow, while ensuring the victim is adequately ventilated.

In practical application, this means performing 30 effective chest compressions followed by 2 rescue breaths before repeating the cycle. This rhythm is designed to keep the rescuer focused on maintaining a high compression rate, which is vital for the victim's chance of survival until emergency medical services arrive.

The other choices outline incorrect ratios that may either underemphasize the importance of compressions or provide a less effective method for delivering ventilation, thus not aligning with the recommended procedures for CPR in emergency situations.