In case of respiratory arrest, what is the recommended method for ventilation for an adult casualty?

The correct response indicates that mouth-to-mask ventilation or bag-valve-mask (BVM) is the recommended method for ventilating an adult casualty in the event of respiratory arrest. This approach is preferred because it provides effective and controlled delivery of oxygen to the lungs while minimizing the risk of further complications or contamination.

Mouth-to-mask ventilation prevents direct contact with the casualty's oral fluids, which significantly reduces the risk of disease transmission. This technique involves a one-way valve mask that allows the rescuer to deliver positive pressure ventilation effectively. Additionally, using a bag-valve-mask system enhances this method, as it enables the rescuer to deliver higher volumes of air more efficiently.

Using an appropriate device ensures that adequate tidal volume is achieved and that the oxygen supply is sufficient to support a non-breathing casualty until advanced medical help arrives. This method is critical in emergency scenarios where quick and effective ventilation can significantly increase the chances of survival.

Other options, while potentially useful in specific scenarios, do not provide the same level of efficacy or safety in ventilation during respiratory arrest.