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 102 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

Dominic

  • Member
  • Posts: 328
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

Empathy draws a more positive response from the patient because it is based on the willingness of th Empathy draws a more positive response from the patient because it is based on the willingness of th
Patient Teaching Methods Cont. Patient Teaching Methods Cont.
ROM exercises on a patient’s wrist: radial deviation. ROM exercises on a patient’s wrist: radial deviation.
When the EGR valve opens, exhaust gases flow through the valve and into passages in the intake ... When the EGR valve opens, exhaust gases flow through the valve and into passages in the intake ...
Tumor marker analysis of a patient with no evidence of disease monitored for tumor recurrence. The ... Tumor marker analysis of a patient with no evidence of disease monitored for tumor recurrence. The ...
The inguinal area. Take great care when applying deep pressure in this region The inguinal area. Take great care when applying deep pressure in this region
Video: Diversity of Living Creatures - Charles Darwin & the Beagle's Voyage

For a complete list of videos, visit our video library