What is the recommended compression-to-ventilation ratio for single-rescuer adult CPR without an advanced airway?

Answer and explanation

Correct answer: B. 30 compressions to 2 breaths

  1. Step 1: In adult Basic Life Support (BLS), standardized compression-to-ventilation ratios optimize blood flow to the heart and brain while delivering sufficient gas exchange.
  2. Step 2: For a single rescuer performing CPR on an adult in cardiac arrest without an advanced airway, the universal compression-to-ventilation ratio is 30 compressions to 2 breaths.
Answer
30 compressions to 2 breaths.
Why not the others: 15 compressions to 2 breaths is the two-rescuer pediatric ratio, while 20 to 1 and 50 to 2 are non-standard ratios in adult basic life support.

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