During volume-targeted assist/control with a Pulmonetic Systems LTV 1000, the tidal volume is set at 800 mL, and inspiratory time is set at 1 s. Inspiration will end when which of the following is reached?
a. Tidal volume of 800 mL c. Set pressure limit
b. Inspiratory time of 1 s d. Flow rate of 24 L/min
ANS: D
During volume-targeted breaths, the peak flow at the beginning of inspiration is calculated by the ventilator so that the tidal volume can be delivered during the set inspiratory time, and inspiration ends when flow decreases to 50% of the peak or 10 L/min, whichever is highest. The calculated flow rate is 0.8 L ÷ 1 s, or 0.8 L ÷ 1/60 of a second. Flow rate = 48 L/min; 50% of 48 L/min is 24 L/min.
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