UV Radiation Flashcards by jasmine mander

heliotherapy

therapeutic use of sunlight

How well did you know this?

Not at all

Perfectly

actinotherapy

therapeutic use of light from lamp

How well did you know this?

Not at all

Perfectly

UVA lengths

400-315 nm

How well did you know this?

Not at all

Perfectly

UVB lengths

315-280 nm

How well did you know this?

Not at all

Perfectly

UVC lengths

280-100 nm

How well did you know this?

Not at all

Perfectly

biological effects depend on __

wavelength

How well did you know this?

Not at all

Perfectly

__ and __ readily absorbed by air

UVR UVC

How well did you know this?

Not at all

Perfectly

UV photons have __ energy than visible light

How well did you know this?

Not at all

Perfectly

UV photos provoke __ in tissues causing ___

chemical reactions

damage

How well did you know this?

Not at all

Perfectly

two source of UV production

vaporized mercury

fluorescent tubes

How well did you know this?

Not at all

Perfectly

electrons flow through __ pressure mercury vapour (mercury lamp)

medium

How well did you know this?

Not at all

Perfectly

Mercury vapour lamp

higher orbit and fall back to stable

How well did you know this?

Not at all

Perfectly

__ pressure merc vapour (UV fluorscent lamp)

low

How well did you know this?

Not at all

Perfectly

is UV florescent low or high merc vapour

low

How well did you know this?

Not at all

Perfectly

UV fluorescent lamp

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

How well did you know this?

Not at all

Perfectly

Lamps produce wavelengths of __

mix of UVA, B C, visible light and infrared

How well did you know this?

Not at all

Perfectly

do mercury lamps or fluorescent lamps warm up quicker

fluorescent need 1 minute

mercs need several minutes

How well did you know this?

Not at all

Perfectly

UV lamps life span

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

500-1000 useful lamp life

How well did you know this?

Not at all

Perfectly

Broadband UVB

280-320 nm

starting point

How well did you know this?

Not at all

Perfectly

narrowband UVB

311-313 nm

more effective

How well did you know this?

Not at all

Perfectly

how often should UV lamps be calibrated

twice/year

How well did you know this?

Not at all

Perfectly

Uvr subjective

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

How well did you know this?

Not at all

Perfectly

skin types

1-6 (always burns to always tans)

How well did you know this?

Not at all

Perfectly

biological effects of UVR

on skin: erythema

How well did you know this?

Not at all

Perfectly

Effects of UVR on skin

``` tanning desquamation epdiermal hyperplasia vitamin d production immunosupporession ```

melanogenesis

tanning

erythema

suburn

Effects of UVR on eyes

photokeratitis / conjunctivitis | cataract

UVB is ___ more potent than UVA

100-1000

UVC is ___ more potent that UVA

10 000

therapeutic devices use __ and __

UVA n B

psoriasis requires __

UVB

Erythema usually caused by ___ or high dose of ___

UVB | UVA

__ only used for wound care

UVC

latent period erythema

2-4 hrs, max intensity 8-24 hrs

Erythema levels

1-4 1 is mildly pink 4 is red blistering

MED means

minimal erythemal dose

the degree of erythema __ as the wavelength grows longer

decreases

UV doses for psoriasis and pruritus

E0 and E1

UV dose for acne

UV for chronic wound care

E3/4

factors determining E1

e1 of lamp and patient skin type

intensity __ to distance

inversely proportional

Skin type to photo test dose | 1-6

400, 600, 800 4,5,6 need 1000 mj

BB- UVB dose given in

type 1 -6 mj alternating dose

1 5-10 2 15-30 3-30-40 4 40-50 6 50-75

least visible response

last to appear | first to disappear

what to record for UVR

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

tanning occurs in __ epidermis

deep

tanning beds are _

UVA

tanning

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

desquamation

after erythema | due to accelerated casting of dead skin (peeling)

when would you not increase dose

desquamation cue maybe peeling has happened n epidermal thickness decreased

how to progress BB UVB dose

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

no erythema or pain how must to inc dose

10%

mild erythema no pain increase dose

mild erythema minimal pain increase dose

same dose

mod erythema increase dose

decrease 10%

severe erythema increase dose

hold treatment

portable lamp to repeat E1 dose add ___ of previous dose

20-25%

portable lamp to repeat E2 dose add ___ of previous dose

50%

portable lamp to repeat E3 dose add ___ of previous dose

75%

portable lamp to repeat E4 dose add ___ of previous dose

dont progress

new dose time=

old dose time x new distance square over old distance squared

when to give follow up UV E0 E1 E2 E3

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

``` if treatment missed for 4 days 7 days 13 days 20 days 27 days more than 28 days ```

``` 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 ```

how much body exposure for E0 1 2 3 4

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

T/F exposure to UV major etiologic in skin cancer

yes

conjunctivitis

gritty sensation in eyes photophobia lacrimation spasm of eyelids mm

photokeratitis

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

cataract

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

abnormal responses to UVR

acquired idiopathic response photosensization by drugs dermatoses exacerbated

UVR contraindications

``` photoallergy drugs that cause photosensitive acute eczema herpes pulmonary TB tumours recent skin graft ```

ozone produced at __

260 nm reacting w oxygen

UV Radiation Flashcards

(74 cards)