Ch5 Iv And Contrast Flashcards Preview

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Flashcards in Ch5 Iv And Contrast Deck (98)
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1

Contrast agent p 4

Compound usually pharmaceutical in nature, which when administered to a patient , may improve the sensitivity and specify clinical diagnoses

2

Most contrast agents used do what? P 4

Caused perfumed tissues to enhance

Appear brighter on images because attenuated xray beam

3

Negative contrast agents p 4

Air
Water

4

Two things negative contrast agents do? P 4

Distend structure

Improve visualization of internal structures

5

Five contrast media categories p 4

Intravenous
Oral
Rectal
Intrathecal
Intraarticulate

6

Increases the attenuation of X-ray beam and causes enhancement? P 6

Iodine

7

Intravenous contrast p 6

Injected into bloodstream

8

Iodine causes what on ct film? P 6

Brighter image

9

Enhancement p 6

Increased brightness by contrast on ct image

10

Ionic agents p 6

Break into charged particles in the bloodstream

11

Non-ionic contrast p 7

Do not divide into charged particles rather entire until excreted by kidneys

12

Effects how well contrast tolerated p 7

Less an agent breaks down into greater number charged particles , the better tolerated

13

Osmolality p 7

Concentration of molecular particles in contrast agent

14

Two iv contrast osmality groups

Low osmolar

High osmolar

15

Non ionic contrast and osmaliity p 7

Low osmolar category due to lower concentration of particles

16

Lower the osmolity effects on the patient p 7

Better tolerated by patient

17

Why need drink lots water both before and after contrast exam? P 7

Hypertonic solutions compared to blood plasma cause movement of water within tissues into vascular space, causing dehydration

18

Viscosity p 8

Measure of thickness of liquid related to frictional force of molecules of substance as they pass one another

19

______the contrast the more force required to administer the solution . Therefore , _____ viscosity is better

Thicker

Lower

20

Kidneys have hard time clearing ____ molecules out blood p8

Large

21

Minor reactions

Nausea
Chills
Vomiting
Feeling warm
Minor hives
Metallic taste
Itching
Shaking
Headache
Dizziness
Sweating

22

Moderate reactions

Moderate hives
Change pulse rate
Hypotension/ hypertension
Wheezing
Bronchospasm/ larygynospasm
Facial edema


23

Two mechanisms of reactions p 8

Chemotoxic reaction
Idiosyncratic

24

Chemotoxic reaction p 9

Effected by total volume of the agent and rate of injection

25

Idiosyncratic reaction p9

Reactions not caused by injection rate and type

26

Ionic, high osmolar contrast has more molecular particles than low osmolar contrast resulting in ? P 10

Osmotic process- draw water from body tissues and cells

27

____ reduces viscosity of contrast prior to injection

Warming

28

_____ the viscosity the more force to inject causing injection site pain

Thicker

29

______injection rates and _____ concentration of contrast have increased reactions

Higher
Higher

30

Pre medicating patient with before injection? P 12

Antihistamine
Steroid