This topic contains a solution. Click here to go to the answer

Author Question: What will result from applying positive pressure below the critical opening pressure to alveoli that ... (Read 58 times)

student77

  • Hero Member
  • *****
  • Posts: 567
What will result from applying positive pressure below the critical opening pressure to alveoli that are collapsed?
 
  A. The patient's hypoxemia may be corrected.
  B. The collapsed alveoli become overdistended.
  C. The lung's pressure-volume relationship changes sharply.
  D. Ventilation fails to enter these alveoli.

Question 2

Calculate a patient's alveolar ventilation (A) when the respiratory rate (f) is 12 breaths/minute, the tidal volume (VT) is 600 ml, and the dead space volume (VD) is 150 ml.
 
  A. 7,200 ml/minute
  B. 5,400 ml/minute
  C. 4,000 ml/minute
  D. 1,800 ml/minute



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cclemon1

  • Sr. Member
  • ****
  • Posts: 312
Answer to Question 1

ANS: D
A. Incorrect response: Perfusion will continue past collapsed alveoli.
B. Incorrect response: The collapsed alveoli do not inflate at all when the critical opening pressure is not achieved.
C. Incorrect response: The lung's pressure-volume curve remains flat because volume does not change as no gas enters these alveoli.
D. Correct response: Because the critical opening pressure is not reached, these alveoli fail to open, and ventilation continues to be absent while perfusion persists. Consequently, the patient's hypoxemia remains uncorrected.

Answer to Question 2

ANS: B
A. Incorrect response: See explanation B.
B. Correct response: This patient's alveolar ventilation (A) is calculated as follows:
STEP 1: Determine the dead space ventilation (D).
D = f(VD)
= (12 breaths/minute)(150 ml)
= 1,800 ml/minute
STEP 2: Find the minute ventilation (E).
E = f(VT)
= (12 breaths/minute)(600 ml)
= 7,200 ml/minute
STEP 3: Calculate the alveolar ventilation (A).
A = E  D
= 7,200 ml/minute  1,800 ml/minute
= 5,400 ml/minute
Alternatively,
12 breaths/minute (600 ml 150 ml) = 5,400 ml/minute

C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.




student77

  • Member
  • Posts: 567
Reply 2 on: Jul 16, 2018
Thanks for the timely response, appreciate it


komodo7

  • Member
  • Posts: 322
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

For a complete list of videos, visit our video library