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545 > UV > Flashcards

UV Flashcards

1
Q

___ relationship between wavelength ad UV energy

A

inverse

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2
Q

wave length is measured in

A

nanometers

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3
Q

increase wavelength

A

UVC, UVB, UVA , colours, Infared

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4
Q

increasing photon energy

A

inferred, colour, UVA, B, C

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5
Q

most harmful

A

UVC

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6
Q

can you feel infrared

A

yes but you can’t see

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7
Q

UVB is ___ more potent than UVA in terms of biological effect

A

1000

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8
Q

why is UVB more potent than UVA

A

b/c its more efficiently absorbed by skin

has more photon energy

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9
Q

why does UVC reach earth surface

A

because ozone layer

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10
Q

acute effects of UV light on skin

A 
vitamin D synthesis 
epidermal hyperproflieration (thickness)
hyper pigmentation (tanning)
sunburn (erythema, edema)
immunosuppression
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11
Q

chronic effect of UV light on skin

A

photoaging
immunosuppression
skin cancer

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12
Q

hows skin cancer come about

A

DNA damage and chronic immunosuppression

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13
Q

T/F tan is a response to injury

A

YES

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14
Q

which one is for burning and which for aging

A

UVB - burning

UVA - aging

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15
Q

___ is the only known beneficial effect of UV light

A

vitamin d metabolism

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16
Q

T/F both UVB and UVA contribute to skin cancer

A

T

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17
Q

photoadaptation

A

with repeated exposure to UV, acute response to skin ages is this

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18
Q

photo adaptation is due to

A

inc melanization of skin (tanning)

epidermal hyperprolifferation

19
Q

how often is UV light given for therapy benefits

A

2-3 x week

25-50 sessions per course

20
Q

T/F the therapeutic dose of UV light is higher than the dose that will cause an acute sunburn

A

yes

21
Q

why does UV therapy burn if its higher than sunburn

A

because photoadpation allows us to start low dose and inc

22
Q

measuring UVB light equation

A

seconds x intensity = fluence (j/cm)

23
Q

3 ways to determine starting dose of UV therapy

A

MED testing
skin typing
Empiric

24
Q

MED testing

A

minimal dose that will cause redness, examine it 24 hrs later

25
Q

Skin typing

A

1-6, from burn easily and I rarely tan, to very dark skin

26
Q

T/F e1-4 system is used alot

A

not

27
Q

Empiric

A

everyone starts at same dose no matter what

28
Q

UV light dosimetry

A

start at 70% of MED if using this method

increase 5-10% each session

29
Q

do we give UVB or UVA

A

B because more effective

30
Q

natural sunlight is what type

A

heliotherapy

31
Q

tanning booths are predomintayl what

A

UVA

32
Q

how can photosensitizes be adminsitered

A

orally, bathtub to soak in, cream`

33
Q

whats wrong with PUVA

A

its carcinogenic

34
Q

___ most commonly used form of phototherapy in clinics

A

UVB

35
Q

is UVB broad or narrow band more effective

A

narrow but exposure time is longer

36
Q

dermatoses amenable to UV therapy

A

psoriasis
eczema
vitilgo

37
Q

in psoriasis/ exczema phototherapy is ___ to overactive T cells in the skin

A

immunosuppressive

38
Q

the itch that rashes is

A

eczema

39
Q

T//F UVB may be combined with UVA to treat eczema

A

T

40
Q

Vitilligo requires

A

narrow UVB or PUVA

BROAD IS NOT EFFECTIVE

41
Q

__ if effective in decreasing pruritus

A

UVB

42
Q

photodermatoses

A

ppl are sensitive to outdoor light exposure

they can get desensitived

43
Q

cutaneous lymphoma treated with

A

UVB

44
Q

contraindications for UV

A

skin cancer
connective tissue disease (lupus)
photosensitive (some drugs cause this)

545 (34 decks)

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