Which ventilation mode was the patient on in the RDS scenario?

• A. Assist-Control mode
• B. SIMV mode
• C. Volume Control mode
• D. CPAP mode

Answer: (A)

In this RDS context, the goal is reliable, adequate ventilation to keep alveoli open and remove CO2 when the lungs are stiff from surfactant deficiency. A mode that guarantees a prescribed tidal volume on every breath and supports the infant’s efforts is preferred. Assist-Control does just that: it delivers a set tidal volume for every inspiratory effort or at a scheduled rate, so each breath is fully supported even as the baby tries to breathe on their own. This ensures a minimum minute ventilation and consistent gas exchange, which is especially important in RDS when lung mechanics are compromised.

Compared to this, SIMV allows spontaneous breaths that may fall short of the target volume, leading to less predictable ventilation; Volume Control focuses on delivering a fixed volume but is less about actively supporting each spontaneous breath; CPAP provides continuous pressure without mandatory breaths, which isn’t the same as ventilator-assisted breaths. So delivering breaths with a guaranteed volume and backing up the infant’s efforts aligns with Assist-Control.