In MMV, how are mechanical breaths delivered in terms of volume control?

• A. They are solely pressure-limited
• B. They can be delivered as either volume control or pressure-regulated volume control
• C. They are fixed at a set tidal volume only
• D. They provide variable tidal volume based on patient effort

Answer: (B)

In Mandatory Minute Ventilation (MMV) mode, mechanical breaths can indeed be delivered as either volume control or pressure-regulated volume control. This flexibility is essential because it allows the healthcare provider to tailor the ventilation to the specific needs of the patient, particularly in settings where patient effort may vary.

In volume control, the ventilator is set to deliver a specific tidal volume with each mechanical breath, ensuring that the patient receives a predetermined amount of air. This method guarantees consistent ventilation, addressing concerns of hypo- or hyperventilation caused by inadequate patient effort.

Conversely, pressure-regulated volume control adjusts the delivered tidal volume based on the airway pressure, which can be particularly beneficial for patients with variable lung compliance or resistance. This approach helps prevent barotrauma from excessive pressures while still aiming to achieve the desired tidal volume.

The adaptability of MMV to utilize both strategies enhances the balance between patient comfort and adequate ventilation, allowing for a more personalized and effective respiratory support approach.