Comprehensive Oxygen and Medical Gas Therapy, Respiratory Care Exam Review questions and correct answers year 2025/2026. Answer the pretest questions before studying the chapter. This will help you determine your strong and weak areas in the material covered. 1. A patient is receiving O2 from an E cylinder at 4 L/min through a nasal cannula. The cylinder pressure is 1900 psig. How long will the cylinder run until it is empty? A. 47 min B. 1.7 h C. 2.2 h D. 3.6 h arterial O2 content? pH 7.41 PaCO2 37 mm Hg PaO2 88 mm Hg HCO32 26 mEq/L SaO2 95% Hb 14 g/dL A. 12 mL/dL B. 14 mL/dL C. 16 mL/dL D. 18 mL/dL 6. The respiratory therapist receives an order to set up a 2. After the respiratory therapist sets up a nonrebreathing mask on a patient at a flow of 10 L/min, the reservoir bag collapses before the patient finishes inspiring. The respiratory therapist should do which of the following? A. Change to a simple O2 mask at a flow of 10 L/min. B. Remove the one-way valve from the exhalation port. C. Place the patient on continuous positive airway pressure (CPAP). moderate level of O2