UV

Question 1

___ relationship between wavelength ad UV energy

Answer 1

inverse

Question 2

wave length is measured in

Answer 2

nanometers

Question 3

increase wavelength

Answer 3

UVC, UVB, UVA , colours, Infared

Question 4

increasing photon energy

Answer 4

inferred, colour, UVA, B, C

Question 5

most harmful

Answer 5

UVC

Question 6

can you feel infrared

Answer 6

yes but you can’t see

Question 7

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

Answer 7

1000

Question 8

why is UVB more potent than UVA

Answer 8

b/c its more efficiently absorbed by skin

has more photon energy

Question 9

why does UVC reach earth surface

Answer 9

because ozone layer

Question 10

acute effects of UV light on skin

Answer 10

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

Question 11

chronic effect of UV light on skin

Answer 11

photoaging
immunosuppression
skin cancer

Question 12

hows skin cancer come about

Answer 12

DNA damage and chronic immunosuppression

Question 13

T/F tan is a response to injury

Answer 13

YES

Question 14

which one is for burning and which for aging

Answer 14

UVB - burning

UVA - aging

Question 15

___ is the only known beneficial effect of UV light

Answer 15

vitamin d metabolism

Question 16

T/F both UVB and UVA contribute to skin cancer

Answer 16

T

Question 17

photoadaptation

Answer 17

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

Question 18

photo adaptation is due to

Answer 18

inc melanization of skin (tanning)

epidermal hyperprolifferation

Question 19

how often is UV light given for therapy benefits

Answer 19

2-3 x week

25-50 sessions per course

Question 20

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

Answer 20

yes

Question 21

why does UV therapy burn if its higher than sunburn

Answer 21

because photoadpation allows us to start low dose and inc

Question 22

measuring UVB light equation

Answer 22

seconds x intensity = fluence (j/cm)

Question 23

3 ways to determine starting dose of UV therapy

Answer 23

MED testing
skin typing
Empiric

Question 24

MED testing

Answer 24

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

Question 25

Skin typing

Answer 25

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

Question 26

T/F e1-4 system is used alot

Answer 26

not

Question 27

Empiric

Answer 27

everyone starts at same dose no matter what

Question 28

UV light dosimetry

Answer 28

start at 70% of MED if using this method | increase 5-10% each session

Question 29

do we give UVB or UVA

Answer 29

B because more effective

Question 30

natural sunlight is what type

Answer 30

heliotherapy

Question 31

tanning booths are predomintayl what

Answer 31

UVA

Question 32

how can photosensitizes be adminsitered

Answer 32

orally, bathtub to soak in, cream`

Question 33

whats wrong with PUVA

Answer 33

its carcinogenic

Question 34

___ most commonly used form of phototherapy in clinics

Answer 34

UVB

Question 35

is UVB broad or narrow band more effective

Answer 35

narrow but exposure time is longer

Question 36

dermatoses amenable to UV therapy

Answer 36

psoriasis eczema vitilgo

Question 37

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

Answer 37

immunosuppressive

Question 38

the itch that rashes is

Answer 38

eczema

Question 39

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

Answer 39

T

Question 40

Vitilligo requires

Answer 40

narrow UVB or PUVA BROAD IS NOT EFFECTIVE

Question 41

__ if effective in decreasing pruritus

Answer 41

UVB

Question 42

photodermatoses

Answer 42

ppl are sensitive to outdoor light exposure | they can get desensitived

Question 43

cutaneous lymphoma treated with

Answer 43

UVB

Question 44

contraindications for UV

Answer 44

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