What is the cardiac output, by using the direct Fick method, for ...

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What is the cardiac output, by using the direct Fick method, for a patient with the following he-modynamic values? PaO2 = 80 mm Hg SaO2 = 90 Hb = 14 gm PO2 = 35 mm Hg SO2 = 65 PB = 760 mm Hg O2 = 210 mL/min
 
  a. 3.5 mL/min c. 5.83 mL/min
  b. 4.36 mL/min d. 6.15 mL/min

Question 2

Rupture of the pulmonary artery catheter balloon can cause which of the following?
 
  a. Atrial flutter c. Pneumothorax
  b. Air embolism d. Pulmonary infarc-tion

[kkenney]

Answer to Question 1

ANS: A
CaO2 = (Hb  1.34) SaO2 + (SaO2  0.003).
CaO2 = (14 gm  1.34) 0.90 + (80 mm Hg 0.003).
CaO2 = 17.12 vol.
CO2 = (Hb  1.34) SO2 + (PO2  0.003).
CO2 = (14 gm  1.34) 0.65 + (35  0.003).
CO2 = 12.3 vol.
Q = O2  (CaO2  CO2) 10.
Q = 210 mL/min  (17.12 mL/100 mL  12.3 mL/100mL) 10.
Q = 4.36 mL/min.

Answer to Question 2

ANS: B
If air is used to inflate the balloon and the balloon ruptures, an air embolism is possible.

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[kkenney]

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