Which statement is false?

• A. The S in Opqrst stands for Severity.
• B. The first link in the Chain of Survival is immediate recognition and activation.
• C. The heart refills during the release phase of chest compressions.
• D. The two-rescuer infant compression-to-ventilation ratio is 10:2.

Answer: (D)

The concept here is the standard CPR guidance for infants when two rescuers are present. The statement about a 10:2 compression-to-ventilation ratio is false because two rescuers in infant CPR use a 15:2 ratio, not 10:2. This 15:2 cycle balances delivering enough chest compressions to maintain blood flow with providing ventilations, and rescuers typically switch roles every couple of minutes to keep the quality high. The other items are consistent with guidelines: in OPQRST, the S stands for Severity; the Chain of Survival starts with immediate recognition and activation; and chest compressions rely on chest recoil during the release phase for the heart to refill.