RRT RRT 2 — Questions and Answers
Question 1: Which ventilator mode delivers a set tidal volume regardless of changes in lung compliance?
- Pressure Control (PC)
- Volume Control (VC) (Correct answer)
- Pressure Support (PS)
- CPAP
Correct answer: Volume Control (VC)
Volume Control ventilation delivers a preset tidal volume with each breath regardless of airway resistance or compliance changes.
Question 2: A patient's ABG shows pH 7.28, PaCO2 55 mmHg, HCO3 25 mEq/L. What is the primary disturbance?
- Metabolic acidosis
- Respiratory alkalosis
- Respiratory acidosis (Correct answer)
- Metabolic alkalosis
Correct answer: Respiratory acidosis
Elevated PaCO2 with low pH and normal HCO3 indicates uncompensated respiratory acidosis.
Question 3: Which bronchodilator is classified as a short-acting beta-2 agonist (SABA)?
- Salmeterol
- Formoterol
- Albuterol (Correct answer)
- Tiotropium
Correct answer: Albuterol
Albuterol is a SABA with onset of action within minutes and duration of 4-6 hours.
Question 4: The normal range for PaO2 in a healthy adult breathing room air at sea level is:
- 60-70 mmHg
- 75-100 mmHg (Correct answer)
- 100-120 mmHg
- 50-60 mmHg
Correct answer: 75-100 mmHg
Normal PaO2 for a healthy adult at sea level breathing room air is 75-100 mmHg.
Question 5: Which of the following is the MOST appropriate initial FiO2 for a patient with COPD presenting with acute exacerbation and mild hypoxemia?
- 1.0 (100%)
- 0.60 (60%)
- 0.28 (28%) (Correct answer)
- 0.40 (40%)
Correct answer: 0.28 (28%)
COPD patients should receive controlled low-flow oxygen (24-28%) to avoid suppressing hypoxic drive.
Question 6: Which parameter is used to assess auto-PEEP (intrinsic PEEP) in a mechanically ventilated patient?
- Peak inspiratory pressure
- End-expiratory pause pressure (Correct answer)
- Plateau pressure
- Mean airway pressure
Correct answer: End-expiratory pause pressure
An end-expiratory pause maneuver on the ventilator reveals auto-PEEP by measuring pressure trapped at end expiration.
Question 7: A patient is receiving mechanical ventilation with a plateau pressure of 34 cmH2O. According to ARDS Network guidelines, what is the recommended action?
- Increase tidal volume
- Decrease PEEP
- Reduce tidal volume (Correct answer)
- Increase respiratory rate only
Correct answer: Reduce tidal volume
ARDSNet guidelines recommend reducing tidal volume to keep plateau pressure ≤30 cmH2O to prevent ventilator-induced lung injury.
RRT RRT 2
Which ventilator mode delivers a set tidal volume regardless of changes in lung compliance?