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Author Question: Which of the following are true statements regarding the volume of tissue nitrogen excreted dur-ing ... (Read 64 times)

tiara099

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on: Jul 16, 2018
Which of the following are true statements regarding the volume of tissue nitrogen excreted dur-ing the N2 washout test for measuring functional residual capacity (FRC)?
 
  1. It is not a factor.
  2. It varies with the length of the test.
  3. It varies with the weight of the patient.
  4. It cannot be correct.
  a. 1 only
  b. 2 and 3 only
  c. 2, 3, and 4 only
  d. 4 only

Question 2

To what should all spirometric values obtained under ambient conditions be converted?
 
  a. Ambient temperature and pressure, satu-rated (ATPS)
  b. Standard temperature and pressure, dry (STPD)
  c. Body temperature, ambient pressure, sat-urated (BTPS)
  d. Ambient temperature and pressure, dry (ATPD)


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ryhom

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
The volume of tissue nitrogen excreted (Vtis in milliliters) is directly related to the duration (t in minutes) of the test and weight (W in kilograms) of the patient. A correction for this extra nitro-gen should be made according to the following formula:
Vtis (ml) = (0.1209  0.0665)  (W/70). Vtis (ml) is subtracted from the BTPS-corrected lung volume. The residual volume is the difference between the expiratory reserve volume and the FRC.

Answer to Question 2

ANS: C
All lung volumes and capacities must be reported under BTPS conditions.


tiara099

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

kishoreddi

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Reply 3 on: Yesterday
Wow, this really help

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