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545 > UV Radiation > Flashcards

UV Radiation Flashcards

1
Q

heliotherapy

A

therapeutic use of sunlight

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2
Q

actinotherapy

A

therapeutic use of light from lamp

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3
Q

UVA lengths

A

400-315 nm

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4
Q

UVB lengths

A

315-280 nm

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5
Q

UVC lengths

A

280-100 nm

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6
Q

biological effects depend on __

A

wavelength

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7
Q

__ and __ readily absorbed by air

A

UVR UVC

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8
Q

UV photons have __ energy than visible light

A

more

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9
Q

UV photos provoke __ in tissues causing ___

A

chemical reactions

damage

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10
Q

two source of UV production

A

vaporized mercury

fluorescent tubes

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11
Q

electrons flow through __ pressure mercury vapour (mercury lamp)

A

medium

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12
Q

Mercury vapour lamp

A

higher orbit and fall back to stable

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13
Q

__ pressure merc vapour (UV fluorscent lamp)

A

low

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14
Q

is UV florescent low or high merc vapour

A

low

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15
Q

UV fluorescent lamp

A

absorbed by phosphor coating which can re-emit visible light, UVA or UVB

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16
Q

Lamps produce wavelengths of __

A

mix of UVA, B C, visible light and infrared

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17
Q

do mercury lamps or fluorescent lamps warm up quicker

A

fluorescent need 1 minute

mercs need several minutes

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18
Q

UV lamps life span

A

output decreases w use
fluorescent max output at 100 hrs, merc at 20

500-1000 useful lamp life

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19
Q

Broadband UVB

A

280-320 nm

starting point

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20
Q

narrowband UVB

A

311-313 nm

more effective

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21
Q

how often should UV lamps be calibrated

A

twice/year

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22
Q

Uvr subjective

A 
skin type
history in the sun
allergies/meds
previous skin cancer
liver disease
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23
Q

skin types

A

1-6 (always burns to always tans)

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24
Q

biological effects of UVR

A

on skin: erythema

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25
Q

Effects of UVR on skin

A 
tanning
desquamation 
epdiermal hyperplasia
vitamin d production 
immunosupporession
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26
Q

melanogenesis

A

tanning

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27
Q

erythema

A

suburn

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28
Q

Effects of UVR on eyes

A

photokeratitis / conjunctivitis

cataract

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29
Q

UVB is ___ more potent than UVA

A

100-1000

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30
Q

UVC is ___ more potent that UVA

31
Q

therapeutic devices use __ and __

32
Q

psoriasis requires __

33
Q

Erythema usually caused by ___ or high dose of ___

34
Q

__ only used for wound care

35
Q

latent period erythema

A

2-4 hrs, max intensity 8-24 hrs

36
Q

Erythema levels

A

1-4
1 is mildly pink
4 is red blistering

37
Q

MED means

A

minimal erythemal dose

38
Q

the degree of erythema __ as the wavelength grows longer

39
Q

UV doses for psoriasis and pruritus

40
Q

UV dose for acne

41
Q

UV for chronic wound care

42
Q

factors determining E1

A

e1 of lamp and patient skin type

43
Q

intensity __ to distance

A

inversely proportional

44
Q

Skin type to photo test dose

1-6

A

400, 600, 800

4,5,6 need 1000 mj

45
Q

BB- UVB dose given in

46
Q

type 1 -6 mj alternating dose

A

1 5-10
2 15-30
3-30-40
4 40-50

6 50-75

47
Q

least visible response

A

last to appear

first to disappear

48
Q

what to record for UVR

A

date, time, lamp serial number, distance, exposure duration, area treated, reaction

49
Q

tanning occurs in __ epidermis

50
Q

tanning beds are _

51
Q

tanning

A

tyrosine converted to melanin
which goes to superficial laye
r over 2 days

52
Q

desquamation

A

after erythema

due to accelerated casting of dead skin (peeling)

53
Q

when would you not increase dose

A

desquamation cue maybe peeling has happened n epidermal thickness decreased

54
Q

how to progress BB UVB dose

A

5-10 for type 1/2
10-15 for type 3
15-20 for skin 4/5
20-30 for type 6

55
Q

no erythema or pain how must to inc dose

56
Q

mild erythema no pain increase dose

57
Q

mild erythema minimal pain increase dose

58
Q

mod erythema increase dose

A

decrease 10%

59
Q

severe erythema increase dose

A

hold treatment

60
Q

portable lamp

to repeat E1 dose add ___ of previous dose

61
Q

portable lamp

to repeat E2 dose add ___ of previous dose

62
Q

portable lamp

to repeat E3 dose add ___ of previous dose

63
Q

portable lamp

to repeat E4 dose add ___ of previous dose

A

dont progress

64
Q

new dose time=

A

old dose time x new distance square over old distance squared

65
Q

when to give follow up UV

E0
E1
E2
E3

A

E0 - 24 hrs
E1 - 1-2 days
E2 - 3-4 days
E3 7-10 days

66
Q 
if treatment missed for 4 days
7 days
13 days
20 days
27 days
more than 28 days
A 
4 - usual progression 
7 - usual dose
13- use the dose -4 treaments ago
20 - -8 treatments ago
27- -12 treatments ago
28 or more - original dose
67
Q

how much body exposure for E0 1 2 3 4

A

E01 can be whole
E2 20-25%
E3 4% or 600cm
E4 dead or necrotic wound only

68
Q

T/F exposure to UV major etiologic in skin cancer

69
Q

conjunctivitis

A

gritty sensation in eyes
photophobia
lacrimation
spasm of eyelids mm

70
Q

photokeratitis

A 
inflammation of cornea
severe pain 
30 mins - 24 hrs
resolves after 48 
not permanent
eyes not tolerate to UV
71
Q

cataract

A

caused by chronic exposure to UV
partial / complete loss of lens
concern in PUVA

72
Q

abnormal responses to UVR

A

acquired idiopathic response
photosensization by drugs
dermatoses exacerbated

73
Q

UVR contraindications

A 
photoallergy
drugs that cause photosensitive
acute eczema
herpes
pulmonary TB
tumours
recent skin graft
74
Q

ozone produced at __

A

260 nm reacting w oxygen

545 (34 decks)

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