CRE Respiratory Therapy & Intervention Techniques 2

Question 1

When setting up a small-volume nebulizer (SVN), what is the optimal flow rate to drive the nebulizer for most medications?

Accepted Answer

6–8 L/min

Answer

A flow rate of 6–8 L/min is recommended to produce the optimal particle size (1–5 µm) for alveolar deposition.

Question 2

A patient with COPD receives ipratropium bromide via MDI. What is the primary mechanism of action of this bronchodilator?

Accepted Answer

Anticholinergic (muscarinic) blockade

Answer

Ipratropium is an anticholinergic agent that blocks muscarinic receptors, reducing bronchoconstriction caused by parasympathetic stimulation.

Question 3

Which chest physiotherapy technique uses a mechanical device applied externally to the thorax to generate oscillatory pressure and mobilize secretions?

Accepted Answer

High-frequency chest wall oscillation (HFCWO)

Answer

HFCWO devices (e.g., the Vest) apply rapid compressions to the chest wall to thin and mobilize mucus toward the central airways.

Question 4

A mechanically ventilated patient has a plateau pressure of 32 cmH₂O and a PEEP of 8 cmH₂O. What is the driving pressure?

Accepted Answer

24 cmH₂O

Answer

Driving pressure = plateau pressure − PEEP = 32 − 8 = 24 cmH₂O; values above 15 cmH₂O are associated with higher mortality.

Question 5

During heliox therapy for upper airway obstruction, which helium-to-oxygen mixture is most commonly used when the patient requires supplemental oxygen?

Accepted Answer

70:30 He:O₂

Answer

70:30 He:O₂ (70% helium, 30% oxygen) provides adequate oxygen delivery while maintaining enough helium to reduce turbulent flow.

(CRE) Certified Respiratory Educator Practice Test

(CRE) Certified Respiratory Educator Practice Test

CRE Respiratory Therapy & Intervention Techniques 2