What device on a resuscitation bag-mask device may limit sufficient tidal volume in patients with poor lung compliance?

The pressure relief valve on a resuscitation bag-mask device is crucial for preventing excess pressure during ventilation. When ventilating a patient with poor lung compliance, there may be significant resistance to airflow, leading to the need for higher pressures to deliver an adequate tidal volume. The pressure relief valve may activate and limit the pressure delivered to the lungs if it reaches a certain threshold, thereby restricting the amount of air that can be effectively delivered. This can hinder the ability to provide sufficient tidal volume to patients who are in respiratory distress or have compromised lung function, making it a critical factor to consider during resuscitation efforts.

Other devices like the Venturi mask, oxygen reservoir, and flow regulator serve different purposes in oxygen delivery and do not impact the mechanical aspects of ventilation in the same way. The Venturi mask is designed for delivering a consistent concentration of oxygen, the oxygen reservoir aids in increasing available oxygen flow during inspiration, and the flow regulator is used to control the flow rate of oxygen delivery, but none of these directly limit tidal volume in patients with poor lung compliance as the pressure relief valve does.