Dynamic compliance is defined as?

Dynamic compliance is defined as?

• A. correct Vt / (PIP - PEEP)
• B. correct VT / (Plateau pressure - PEEP)
• C. Flow x Ti
• D. Volume Delivered / (PIP - PEEP)

Answer: (A)

Dynamic compliance measures how easily the respiratory system expands during actual ventilation with flow, reflecting both lung/chest wall stretch and airway resistance. It is calculated as the tidal volume delivered divided by the driving pressure, which is the pressure difference between peak inspiratory pressure and PEEP. This driving pressure (PIP minus PEEP) represents the pressure available to move air into the lungs while flow is ongoing, so Vt/(PIP−PEEP) gives the volume per unit pressure under dynamic conditions. This differs from static compliance, which uses plateau pressure minus PEEP to assess the elastic properties of the lung and chest wall without the influence of airway resistance. While using Volume Delivered instead of tidal volume would yield a similar ratio if they refer to the same volume, the standard expression for dynamic compliance is tidal volume divided by the dynamic driving pressure (PIP−PEEP).

Dynamic compliance measures how easily the respiratory system expands during actual ventilation with flow, reflecting both lung/chest wall stretch and airway resistance. It is calculated as the tidal volume delivered divided by the driving pressure, which is the pressure difference between peak inspiratory pressure and PEEP. This driving pressure (PIP minus PEEP) represents the pressure available to move air into the lungs while flow is ongoing, so Vt/(PIP−PEEP) gives the volume per unit pressure under dynamic conditions.

This differs from static compliance, which uses plateau pressure minus PEEP to assess the elastic properties of the lung and chest wall without the influence of airway resistance. While using Volume Delivered instead of tidal volume would yield a similar ratio if they refer to the same volume, the standard expression for dynamic compliance is tidal volume divided by the dynamic driving pressure (PIP−PEEP).