« previous next »

Author Question: A ventilator's pressure waveform changes when a patient's lung mechanics change, but its vol-ume ... (Read 44 times)

Yi-Chen

  • Hero Member
  • *****
  • Posts: 550
on: Jul 16, 2018
A ventilator's pressure waveform changes when a patient's lung mechanics change, but its vol-ume waveform remains the same. The device does not directly control the delivered volume. What is this ventilator?
 
  a. Volume controller
  b. Pressure controller
  c. Time controller
  d. Flow controller

Question 2

Which of the following are true of the relationship between flow and volume? 1. Volume is the integral of flow. 2. Volume is the derivative of flow. 3. Flow is the derivative of volume.
 
  a. 1 and 2 only
  b. 1 and 3 only
  c. 2 and 3 only
  d. 1, 2, and 3


Laurenleakan

  • Sr. Member
  • ****
  • Posts: 309
Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
If the ventilator controls flow, the flow and volume waveforms will remain consistent, but pres-sure will vary with changes in respiratory mechanics. Flow can be controlled directly using something as simple as a flow meter or as complex as a proportional solenoid valve. Flow can be controlled indirectly by controlling volume.

Answer to Question 2

ANS: B
This follows from the fact that volume and flow are inverse functions of time (i.e., volume is the integral of flow and flow is the derivative of volume).


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Proper placement and monitoring of an automatic blood pressure cuff will reduce the risk of injury o Proper placement and monitoring of an automatic blood pressure cuff will reduce the risk of injury o
Earth Affects People; People Change Earth Earth Affects People; People Change Earth
Patient health history form. Patient health history form.
Foley catheter with balloon in the bladder of a male patient. Foley catheter with balloon in the bladder of a male patient.
The pressure valve maintains the system pressure and allows excess pressure to vent. The vacuum ... The pressure valve maintains the system pressure and allows excess pressure to vent. The vacuum ...
A land snail (Helix aspersa) with the opening that leads to its lung visible at the left. A land snail (Helix aspersa) with the opening that leads to its lung visible at the left.
Video: Brain Lobes Animation

For a complete list of videos, visit our video library