In laser resurfacing, wet towels are placed around the surgical site to ________
A. reduce the risk of thermal damage to other tissue
B. reduce the risk of igniting the alcohol prep
C. protect the patient from possible retinal damage
D. protect the surgical technologist from the heat of the laser
ANS: A
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Which of the following values corresponds most closely to the normal PO2 and PCO2 in the mixed venous blood returning to the lungs from the right side of the heart?
a. PO2 = 40 mm Hg; PCO2 = 46 mm Hg b. PO2 = 40 mm Hg; PCO2 = 100 mm Hg c. PO2 = 100 mm Hg; PCO2 = 40 mm Hg d. PO2 = 100 mm Hg; PCO2 = 46 mm Hg
Which of the following would you expect to occur if ventilation to an area of the lung remained constant but perfusion to this same area decreased?
1. The PACO2 should fall. 2. The PAO2 should fall. 3. The ratio should rise. a. 3 only b. 1 and 2 only c. 1 and 3 only d. 1, 2, and 3