Looking for FREE Respiratory Therapy Formulas and Calculations? We have it ALL. Our questions link to working calculators and provide in-depth information about each equation. *But that’s not all! *Most importantly I have complied a Respiratory Calculation Manual with example exam questions, In addition each question showing a step by step approach on how to solve each problem

## Practice Exam Questions

**1. A patient is volume ventilated at the following settings: PIP = 24 cmH2O, Pplat =17 cmH2O, and flow is 30 L/min. What is the patient’s Airway Resistance?**

A. 10 cmH2O/ L/sec

B. 14 cmH2O/ L/sec

C. 16 cmH2O/ L/sec

D. 19 cmH2O/ L/sec

**Answer: B.**

**2.** Calculate the **A-a gradient** given the following FiO2 = 0.21, Patm = 760 mmHg, pH = 47 mmHg, RQ = 0.8, PaCO2 = 40 mmHg, and PaO2 = 60 mmHg.

A. 39.73 mmHg

B. 25.13 mmHg

C. 12.43 mmHg

D. 69.93 mmHg

**Answer: A.**

**3.** Calculate the **Alveolar Partial Pressure** given the following: FiO2 = 0.21, Patm = 760 mmHg, pH2O = 47 mmHg, RQ = 0.8, and PaCO2 = 40 mmHg.

A. 79.21 mmHg

B. 72.93 mmHg

C. 35.93 mmHg

D. 99.73 mmHg

**Answer: D.**

**4.** Calculate the Alveolar Ventilation given the following: Tidal Volume = 450 mL/breath, Respiratory Rate = 10 breath/min, and Anatomical Dead Space = 100 mL.

A. 2500 mL/min

B. 4500 mL/min

C. 3500 mL/min

D. 5500 mL/min

**Answer: C.**

**5. **Calculate the **Arterial Oxygen Content** given the following: Hgb = 14 g Hgb/100 ml blood, SaO2 = 95%, and PaO2 = 120 mmHg.

A. 12.45 vol%

B. 18.19 vol%

C. 19.27 vol%

D. 21.89 vol%

**Answer: B.**

**6.** D cylinder of oxygen has a remaining pressure of 1200 psi. The patient’s flow rate is 3 L/min. **Calculate the duration of oxygen****?**

A. 45 min

B. 1 hour 19 min

C. 1 hour 5 min

D. 1 hour 30 min

**Answer: C.**

**7**. Calculate the **Pulmonary Vascular Resistance** given the following information. MPAP = 16 mmHg, PAOP = 6 mmHg, and CO = 4.2 l/min.

A. PVR = 190.4 dynes/sec/cm-5

B. PVR = 140.4 dynes/sec/cm-5

C. PVR = 290.4 dynes/sec/cm-5

D. PVR = 390.4 dynes/sec/cm-5

**Answer: A.**

**8.** The ICU intensivist asks you to calculate the** Rapid Shallow Breathing Index (RSBI)** on a patient you have been weaning from the ventilator. You place the patient on CPAP and gather the following results: Vt = 250 mL/breath, Respiratory Rate = 25.

A. 90 breaths/min/L

B. 100 breaths/min/L

C. 110 breaths/min/L

D. 80 breaths/min/L

**Answer: C.**

**9.** Calculate the **Static Compliance compliance** given the following information. Pplat = 20 cmH2O, PEEP = 6 cmH2O, and Tidal Volume = 500 mL.

A. 85.41 mL/cmH2O

B. 105.21 mL/cmH2O

C. 25.73 mL/cmH2O

D. 35.71 mL/cmH2O

**Answer: D.**

**10.** Calculate the **Systemic Vascular Resistance** given the following information. MAP = 16 mmHg, CVP = 6 mmHg, and CO = 4.2 l/min.

A. 90.4 dynes/sec/cm-5

B. 290.4 dynes/sec/cm-5

C. 97.4 dynes/sec/cm-5

D. 190.4 dynes/sec/cm-5

**Answer: D.**