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

Author Question: A pulse oximeter differentiates oxyhemoglobin from deoxygenated hemoglobin by which of the following ... (Read 88 times)

shenderson6

  • Hero Member
  • *****
  • Posts: 573
on: Jul 16, 2018
A pulse oximeter differentiates oxyhemoglobin from deoxygenated hemoglobin by which of the following methods?
 
  a. Relating cyclical changes in light transmis-sion through the sampling site.
  b. Shining and comparing two wavelengths of light through the sampling site.
  c. Direct measurement by a heated polaro-graphic electrode applied to the skin.
  d. Using a color sensing device that absorbs one wavelength of light through the skin.

Question 2

The term used to specify the flow, pressure, and volume waveforms that are graphed relative to time is called:
 
  a. hysteresis.
  b. loop.
  c. waveform.
  d. scalar.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

allisonblackmore

  • Sr. Member
  • ****
  • Posts: 330
Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
A pulse oximeter uses spectrophotometry to differentiate between oxyhemoglobin and deoxy-genated hemoglobin. Two wavelengths of light (660 and 940 nm) are shined through a sample site. Oxyhemoglobin absorbs more light at 940 nm (infrared IR light) than does deoxygenated hemoglobin. Deoxyhemoglobin absorbs more light at 660 nm. The use of cyclical changes in light transmission measured at the sampling site is the method to determine the pulse rate with a pulse oximeter. A heated polarographic electrode is used for transcutaneous partial pressure of oxygen (PtcO2) measurements. A color sensing device is used to detect the amount of carbon dioxide in exhaled gas.

Answer to Question 2

ANS: D
Hysteresis can be thought of as a lagging of one of two associated phenomena; that is, two asso-ciated phenomena fail to coincide or occur simultaneously. The term scalar is used to specify the flow, pressure, and volume waveforms that are graphed relative to time (i.e., pressure, flow, and volume scalars). Basically, six shapes (waveforms) are produced with scalars during mechanical ventilation. The term loop is used to describe a graph of two variables plotted on the x and y co-ordinates, such as pressure-volume and flow-volume loops (these are discussed later in the chap-ter).


shenderson6

  • Member
  • Posts: 573
Reply 2 on: Jul 16, 2018
Gracias!

nanny

  • Member
  • Posts: 313
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Did you know?

Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Hemoglobin Hemoglobin
Pulse oximetry. The small device provides a digital readout of oxygen levels in the blood. Pulse oximetry. The small device provides a digital readout of oxygen levels in the blood.
Effect of pH on oxygen binding to hemoglobin Effect of pH on oxygen binding to hemoglobin
Human hemoglobin variants Human hemoglobin variants
Hand placement for pulse checks Hand placement for pulse checks
Palpation of femoral pulse Palpation of femoral pulse
Video: Structures that affect circulation - arterioles and vasomotor responses and venous return

For a complete list of videos, visit our video library