This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Three sets of pressure, flow, and volume waveforms are depicted below from a patient who is ... (Read 137 times)

abc

  • Hero Member
  • *****
  • Posts: 543
on: Jul 16, 2018
Three sets of pressure, flow, and volume waveforms are depicted below from a patient who is receiving continuous mandatory ventilation. Identify the control variable, and which set of waveforms reflects a decreased lung compliance.
 
  A. control variable: pressure; decreased lung compliance: set C
  B. control variable: pressure; decreased lung compliance: set A
  C. control variable: volume; decreased lung compliance: set B
  D. control variable: volume; decreased lung compliance: set C

Question 2

Which of the following devices are output control valves used to regulate the flow of gas to the patient? I. rack and pinion poppet valves II. proportional valves III. electromagnetic poppet valves IV. pneumatic poppet valves
 
  A. I, II only
  B. III, IV only
  C. I, II, III only
  D. II, III, IV only


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

nixon_s

  • Sr. Member
  • ****
  • Posts: 359
Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
A. Incorrect response: Pressure is not the control variable because its value is different in each set of waveforms. Set C is the correct set of waveforms reflecting decreased lung compliance (stiffer lungs).
B. Incorrect response: Pressure is not the control variable because its value is different in each set of waveforms; therefore it is not constant.
C. Incorrect response: Volume is the control variable because it remains constant in each of the three sets of waveforms. The pressure tracing in set B represents the lowest pressure value among the three presented. Therefore the pressure waveform in set B does not reflect decreased pulmonary compliance.
D. Correct response: Volume is the control variable because it remains constant in each of the three sets of waveforms. The expression volume control means that volume is the control variable, and does not change. Set C signifies the response to decreased lung compliance. Especially, note that the pressure tracing in set C indicates the highest pressure among the three tracings. This finding is consistent with decreased pulmonary compliance.

Answer to Question 2

ANS: DI. Incorrect response: The electric motor/rack and pinion is a ventilator drive mechanism. The drive mechanism of a ventilator produces the force needed to deposit gas into the lungs of the patient.
II. Correct response: A proportional valve resembles a solenoid valve. It is operated via an electric motor whose rotation can be controlled in discrete arcs, or steps. Proportional valves change the size of their openings, thus influencing the shape of the flow-time waveform during inspiration. In fact, because the size of the opening can vary significantly, a variety of waveforms can be produced.
III. Correct response: The electromagnetic poppet valve is the same as a solenoid valve. It uses magnetism created by an electric current to control pneumatic pressure.
IV. Correct response: The pneumatic poppet valve uses small pneumatic pressure to control large pneumatic pressure.


abc

  • Member
  • Posts: 543
Reply 2 on: Jul 16, 2018
Wow, this really help

AISCAMPING

  • Member
  • Posts: 347
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Did you know?

Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.

Visual Acuity Testing: Assist the patient in occluding the eye. Visual Acuity Testing: Assist the patient in occluding the eye.
Common errors in blood pressure assessment Common errors in blood pressure assessment
Patient teaching: lung assessment Patient teaching: lung assessment
Correlations are Depicted in Scatterplots Correlations are Depicted in Scatterplots
Aquamatic pad and heating unit provide dry heat treatment to a patient’s arm. Aquamatic pad and heating unit provide dry heat treatment to a patient’s arm.
Atmospheric pressure decreases with increase in altitude. Atmospheric pressure decreases with increase in altitude.
Video: Regulation of GFR: three methods, autoregulation & autoregulation via myogenic mechanism

For a complete list of videos, visit our video library