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CT Registry Review > Ch 2 > Flashcards

Flashcards in Ch 2 Deck (34):
1

Rights of pt; what is not a right?

Right to considerate and respectful care; Right to refuse medical treatment
Release of pt results in NOT an inherent right - @ discretion of physician

2

Prep for CT Chest w/contrast

NPO 4hrs prior - reduces nausea, vomiting and possible aspiration of contrast

3

Prothrombin time definition and average range

Evaluates coagulation ability for invasive procedure
Normal range: 11-15s

4

Partial thromboplastin time (PTT)

coagulation time of blood

5

Normal platelet count for adults

140,000 - 440,000/mL of blood

6

Normal respiration for children and adults

Children: 20-30 breaths per minute
Adults: 12-20 breaths per minute

7

Average range for normal blood urea nitrogen (BUN)

5-20mg/dL

8

Glomerular filtration rate (GFR)

Rate that creatinine is cleared from bloodstream by renal system

9

3 practices to obtain medical hx

open-ended question, encourage pts to provide max info, repeat @ summarize info to assure accuracy

10

Define systole and types

Contraction of heart
2 types: atrial (contraction of LT/RT atria) and ventricular (contraction of LT/RT ventricles)

11

Define complete cardiac diastole

Relaxation of heart muscle (relaxed LT/RT atria and ventricles)
2 types: atrial and ventricular
Indicated by T wave of electrocardiogram (ECG)

12

When is the best time of image heart for least motion artifact?

Diastolic phase

13

Normal GFR for women and men

Women: 60 + or - 10mL/min/m2
Men: 70 + or - 14mL/min/m2

14

Coumadin (Warfarin)

anticoagulant that prevents blood clots; reduces heart attack and stroke

15

2 advantages of auto injectors over manual bolus injections

Increased tissue enhancement (due to faster injection time) and uniform administration of contrast over length of study

16

Parenteral contrast definition and 5 types

Injection of contrast into bloodstream
5 types: intravenous, intramuscular, subcutaneous, intradermal. intrathecal

17

Osmolality purpose in CT

Measures # of particles per kg of water; Determines potential for adverse reactions

18

Ionic contrast osmolality

Ionic contrast dissolves into large # of particles: 1000-2400 mOsm/kg

19

Symptoms of vagal reaction

Bradycardia (heartrate -50bpm), hypotension (systolic pressure -80mm/Hg)

20

What treats urticaria (hives)?

Antihistamines

21

Define osmolality

Propensity of agent to cause fluid from outside blood vessel (extravascular space) to move into blood stream (intravascular space)

22

Blood plasma half life of iodine contrast

2hrs

23

What three factors would be affected with a decrease in pt dose?

Decreased mAs, decreased kVp and increased pitch

24

What are the four stages of infection?

Incubation (pathogen enters host), prodromal (appearance of signs and symptoms), active/full stage (max appearance of signs and symtoms), convalescence (symptoms diminish and may eventually subside)

25

Other names for strict isolation

Protective or reverse isolation

26

What is strict isolation for?

Used for patients w/risk of infection due to immunosuppresion or other debilatative disease

27

What is a vasovagal reaction?

Systemic hypertension that leads to cerebral ischemia

28

Mild & moderate reactions

Mild: nausea, mild urticaria, warm flushed feeling; Moderate: dyspnea

29

What has lower osmolality: ionic or nonionic?

Nonionic

30

What contrast separates into independent charged particles and what are these charged particles called?

Ionic contrasts separate into charged particles called anions and cations

31

How are vagal reactions treated?

Increasing blood pressure and atropine to block vagal stimulation of heart

32

Time before pts can resume breastfeeding after IV contrast

12-24hrs

33

How is mAs and pt dose related?

Directly and proportionally related

34

What is effective dose?

Relative risk from exposure to ionizing radiation and based on radiosensitivity of tissue; measured in sieverts (Sv)