RRT RRT MCQ 3

Question 1

A patient is receiving pressure support ventilation of 12 cmH2O. The respiratory therapist notes double-triggering. Which adjustment is MOST appropriate?

Accepted Answer

Adjust expiratory trigger sensitivity (cycle-off criterion)

Answer

Double-triggering is often caused by the ventilator cycling off before the patient's neural inspiratory effort ends; adjusting the expiratory trigger (flow-cycle) sensitivity resolves this.

Question 2

A patient with myasthenia gravis is being evaluated for extubation. Which parameter is MOST predictive of successful weaning?

Accepted Answer

FVC greater than 15 mL/kg

Answer

In neuromuscular disease, FVC >15–20 mL/kg is the primary threshold used to predict adequate ventilatory reserve for extubation.

Question 3

Which inhaled bronchodilator mechanism is responsible for long-acting beta-2 agonist (LABA) duration of action?

Accepted Answer

Lipophilic side chains enabling receptor depot formation

Answer

LABAs like salmeterol have lipophilic side chains that anchor them in the cell membrane, creating a depot that allows prolonged receptor interaction lasting 12–24 hours.

Question 4

A neonate is born at 28 weeks gestation with grunting, nasal flaring, and retractions. Chest X-ray shows diffuse ground-glass opacification. The primary treatment is:

Accepted Answer

Intratracheal surfactant administration

Answer

Infant respiratory distress syndrome (IRDS) from surfactant deficiency is treated with exogenous surfactant replacement therapy administered intratracheally.

Question 5

During high-frequency oscillatory ventilation (HFOV), the primary determinant of oxygenation is:

Accepted Answer

Mean airway pressure (MAP)

Answer

In HFOV, mean airway pressure determines lung recruitment and oxygenation, while amplitude (ΔP) determines CO2 elimination.

RRT Exam Practice Test

RRT Exam Practice Test

RRT RRT MCQ 3