Cardio Final| 300 questions| with complete solutions

Which of the following parameters are major factors in determining tissue oxygenation? 1. Arterial oxygenation 2. Tissue perfusion 3. Oxygen (O2) uptake 4. P/F ratio a. 1 and 3 only b. 1, 2, and 3 only c. 3 and 4 only d. 2, 3, and 4 only correct answer: b. 1, 2, and 3 only What is the normal approximate value for O2 consumption? a. 150 ml/min b. 200 ml/min c. 250 ml/min d. 300 ml/min correct answer: c. 250 ml/min What method(s) is/are used to measure O2 consumption? 1. Fick method 2. Analysis of inspired and expired gases 3. V/Q scans a. 1 only b. 1 and 2 only c. 1 and 3 only d. 1, 2, and 3 correct answer: b. 1 and 2 only What is the normal range for P(A-a)O2 in a healthy 30-year-old person breathing room air? a. 0 to 10 mm Hg b. 5 to 15 mm Hg c. 10 to 20 mm Hg d. Cannot predict correct answer: b. 5 to 15 mm Hg Your patient has a P(A-a)O2 of 200 mm Hg while breathing 100% O2. What is the estimated percentage shunt? a. 5% b. 10% c. 20% d. 30% correct answer: b. 10% What is considered normal for the PaO2/FiO2 ratio? a. Greater than 50 b. Greater than 150