« previous next »

Author Question: A ventilator's pressure waveform changes when a patient's lung mechanics change, but its vol-ume ... (Read 64 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?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates’s recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Teaching an illterate patient Teaching an illterate patient
A visually impaired patient is assisted by a service dog. A visually impaired patient is assisted by a service dog.
Connections of a nitric acid plant, intermediate pressure type Connections of a nitric acid plant, intermediate pressure type
A patient with Cushing’s syndrome (A) before and (B) after receiving treatment. Sharmyn McGraw A patient with Cushing’s syndrome (A) before and (B) after receiving treatment. Sharmyn McGraw
Fossil fuel emissions and climate change Fossil fuel emissions and climate change
Video: Introduction to Autism

For a complete list of videos, visit our video library