What is the typical inspiratory time for a term neonate on ventilation?

• A. 0.25-0.5
• B. 0.5-0.6
• C. 0.6-0.8
• D. 1.0-1.5

Answer: (B)

Ti, the duration of each inhalation, is set to balance delivering enough tidal volume with allowing a full exhale. In term neonates, the lungs are small and breaths are rapid, so an inspiratory time around 0.5 to 0.6 seconds provides enough time for the ventilator to push air in at the required flow while still leaving adequate time for expiration. If Ti is too short, you may under-deliver tidal volume; if it’s too long, expiration can be squeezed and mean airway pressure rises, increasing risk of air trapping. So, about 0.5–0.6 seconds is the typical inspiratory time.