Which ventilation technique uses a mask with a one-way valve to prevent cross-contamination and is suitable for single-rescuer ventilation?

• A. Mouth-to-mouth technique.
• B. Mouth-to-mask technique with a one-way valve.
• C. Manually triggered ventilation device.
• D. One-person bag-valve mask.

Answer: (B)

The main idea is using a barrier device that protects you while delivering breaths when you’re alone. A mouth-to-mask technique with a one-way valve includes a mask that has a one-way valve. This valve lets air flow from you into the patient but prevents the patient’s exhaled air from reaching you, reducing cross-contamination. Because this setup provides a protective barrier and is designed for simple, one-rescuer use, it’s the best fit for single-rescuer ventilation.

Mouth-to-mouth lacks a barrier device and doesn’t automatically protect you from exposure. A manually triggered ventilation device could refer to different tools, but without specifying a mask with a one-way valve, it doesn’t guarantee the same cross-contamination protection. A one-person bag-valve mask can be used by a single rescuer, but many versions require a two-handed seal or involve a bag-valve setup rather than a simple mouth-to-mask with a dedicated one-way valve.