RRT Mechanical Ventilation Flashcards
6 cards from real RRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 RRT Mechanical Ventilation flashcards as text
During a spontaneous breathing trial (SBT), which finding suggests the patient is NOT ready for extubation?
Answer: Rapid shallow breathing index (RSBI) of 120
An RSBI (f/VT) above 105 indicates a high likelihood of extubation failure due to inefficient, rapid, and shallow breathing.
What is the primary purpose of adding pressure support in SIMV mode?
Answer: To overcome the work of breathing imposed by the endotracheal tube and circuit
Pressure support in SIMV reduces the inspiratory work of breathing through the high-resistance ETT during spontaneous breaths.
Which parameter is used to calculate the driving pressure in mechanical ventilation?
Answer: Plateau pressure minus PEEP
Driving pressure = plateau pressure − PEEP, reflecting the tidal stress placed on the respiratory system with each breath.
In pressure-controlled ventilation, what happens to tidal volume if lung compliance decreases?
Answer: Tidal volume decreases
In pressure-controlled mode, the driving pressure is fixed; decreased compliance results in smaller tidal volumes delivered per breath.
What is the best initial ventilator setting for FiO2 when initiating mechanical ventilation?
Answer: 1.0 (100%), then titrate down
Starting at FiO2 1.0 ensures adequate oxygenation during the initial unstable period; it is then titrated to the lowest level maintaining SpO2 ≥92%.
High-frequency oscillatory ventilation (HFOV) is characterized by which of the following?
Answer: Very small tidal volumes at high frequency (3–15 Hz)
HFOV uses tidal volumes smaller than anatomical dead space delivered at 3–15 Hz, relying on non-convective gas transport mechanisms.