Which device is commonly used for providing breaths during CPR for adults?

The bag-mask device is commonly used during CPR for adults to provide positive pressure ventilation. This device allows a rescuer to deliver breaths effectively while ensuring a proper seal over the patient's mouth and nose. The design of the bag-mask device enables the rescuer to deliver oxygen-rich air into the lungs of the patient, helping to restore oxygenation during a critical emergency when the person is not breathing adequately or at all.

Using a bag-mask device is particularly essential in emergency situations where advanced airway management might not be immediately available. It is designed to be used with two hands for optimal control and effectiveness, ensuring that air is properly delivered into the lungs. This method is often used in conjunction with chest compressions during CPR, creating a rhythm of compressions and ventilations that is vital for maintaining circulation and oxygenation until higher levels of care can be reached.

Other options do not fulfill the same role in providing mechanical ventilation during CPR. The automated external defibrillator (AED) is crucial for diagnosing and treating certain types of cardiac arrest through defibrillation but does not assist with ventilation. A stethoscope is a diagnostic tool used for listening to heart and lung sounds, rather than delivering respiration. An oxygen tank can provide supplemental oxygen but requires proper fittings and methods