Ventilator Modes
This ventilator mode delivers a preset tidal volume while airway pressure varies.
What is VCV?
An obese patient undergoing laparoscopic surgery develops worsening compliance. Which ventilator mode is often preferred?
What is PCV?
RR = 10. What is the respiratory cycle time?
What is 6 seconds?
This bellows rises during exhalation.
What is Ascending (Standing) Bellows?
This process removes carbon dioxide.
What is Ventilation?
This mode delivers a preset inspiratory pressure while tidal volume changes depending on compliance.
What is PCV?
During VCV, lung compliance suddenly decreases. Which ventilator variable increases?
What is Peak Inspiratory Pressure (PIP)?
TV = 600 mL
Inspiratory flow = 24 L/min
RR = 10
What is the I:E ratio?
What is 1:3?
Which bellows is safer because it visibly detects a disconnect?
What is Ascending Bellows?
This process increases arterial oxygen.
What is Oxygenation?
This mode automatically adjusts inspiratory pressure to guarantee a target tidal volume.
What is PCVG?
During PCV, bronchospasm develops. Which ventilator variable decreases?
What is Tidal Volume?
TV = 400 mL
RR = 12
What is the respiratory cycle time?
What is 5 seconds?
This ventilator drive mechanism uses electricity only.
What is the Piston Ventilator?
The normal respiratory quotient discussed in lecture.
What is 0.8?
This spontaneous breathing mode is patient-triggered, pressure-limited, and flow-cycled.
What is PSV?
A patient with an LMA is breathing spontaneously near the end of surgery. Which ventilator mode is commonly used?
What is PSV?
A ventilator has an I:E ratio of 1:2 and a respiratory cycle of 6 seconds.
How long is inspiration?
What is 2 seconds?
Fresh gas decoupling directs fresh gas here during inspiration.
What is the reservoir bag?
A resting 70-kg adult consumes approximately this much oxygen each minute.
What is 250 mL/min?
This ventilator mode synchronizes mandatory breaths with spontaneous breaths to reduce breath stacking.
What is SIMV?
Which ventilator mode is commonly selected when weaning a patient from mechanical ventilation?
What is SIMV (or PSV, depending on the scenario).
TV = 300
RR = 20
I:E = 1:2
What inspiratory flow (L/min) is required?
18 L/min
Bellows create approximately this much automatic PEEP.
What is 2–3 cmH₂O?
The formula for compliance is:
Compliance = ΔV Change in volume (usually tidal volume, mL) divided by ΔP = Change in pressure (cmH₂O)