Which of the following statements describes an arteriovenous CO2 ...

[LaDunn]

Which of the following statements describes an arteriovenous CO2 removal system?
 
  A. Oxygenation can be fully supported with this device.
  B. Blood flow through the system is driven by a mechanical pump.
  C. Nearly all the CO2 can be removed.
  D. Approximately, 50 of the cardiac output is shunted.

Question 2

According to the Hagen-Poiseuille law, which of the following factors influence laminar flow of a gas flowing through a conducting tube? I. density of the gas II. viscosity of the gas III. pressure gradient IV. length of the tube
 
  A. I, III only
  B. II, IV only
  C. I, III, IV only
  D. II, III, IV only

[olivia_paige29]

Answer to Question 1

ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: A novel ECLS technique that does not require a pump is an arteriovenous CO2 removal (AVCO2R) system. With this technique an arteriovenous shunt routes approximately 20 of the cardiac output through a gas exchange device. Blood flow is driven only by the patient's blood pressure. The current design requires 12 to 16 Fr percutaneous catheters and can provide nearly total CO2 removal. Oxygenation cannot be fully supported with this device, and thus some level of respiratory system support is required.
D. Incorrect response: See explanation C.

Answer to Question 2

ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: According to the Hagen-Poiseuille law of laminar flow, laminar flow is affected by (1) the radius of the conducting tube, (2) the pressure gradient, (3) the viscosity of the gas, and (4) the length of the conducting tube.

[LaDunn]

TY

[olivia_paige29]

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