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uvr Flashcards

1
Q

what are the band of UVR

A

UVA, UVB, UVC

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2
Q

wavelength of UVA

A

320 – 400 nm

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3
Q

wavelength of UVB

A

290-320 nm

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4
Q

wavelength of UVC

A

< 100-290 nm

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5
Q

other name for UVA

A

long-wave UV or near UV

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6
Q

other name for UVB

A

middle-wave UV

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7
Q

other name for UVC

A

short-wave UV or far UV

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8
Q

use of UVA

A

blacklight

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9
Q

use of UVB

A

skin erythema, sunburn

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10
Q

use of UVC

A

germicidal, bacteridal

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11
Q

goal effect of UVR in the body

A

photochemical effect

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12
Q

discuss absorption of UVR by the skin

A

absorbed within first 1-2 mm of skin; 80-90% of dermis

given that the laws of radiation are applied

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13
Q

possible effects of excessive natural UVR exposure

A

DNA damage

cutaneous malignant melanoma

basal-cell carcinoma

squamous-cell carcinoma

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14
Q

factors that directly affect UV penetration

A

intensity
wavelength
power of radiation source
exposure time

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15
Q

factors that indirectly affect UV penetration

A

distance of radiation source
frequency
size of area
thickness of skin
pigmentation of skin

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16
Q

describe mercury arc lamp

A

small and used for smaller areas; emits radiation at constant intensity

hot quartz and cold quartz

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17
Q

compare hot and cold quarts in terms of source

A

hot - Burner (argon gas and mercury)

cold - Quartz tube with mercury (ionized vapor)

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18
Q

compare hot and cold quarts in terms of psi and temp

A

hot - inc pressure & temperature

cold - dec pressure & temperature

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19
Q

compare hot and cold quarts in terms of erythema and pigmentation

A

hot - (+) erythema and pigmentation

cold - minimal erythema and (-) pigmentation

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20
Q

compare hot and cold quarts in terms of application

A

hot - ≥15” from the area

cold - close proximity

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21
Q

compare hot and cold quarts in terms of warm-up

A

hot - No need for warm-up

cold - Needs 5 min warm-up

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22
Q

what are the physiologic effects of UVR

A

erythema production

tanning

epidermal hyperplasia

vitamin D synthesis

bactericidal effect

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23
Q

exp erythema production

A

skin redness

dilation d/t histamine or prostaglandin release

exposure to UVB or UVA after drug sensitization

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24
Q

exp tanning

A

delayed pigmentation of skin

inc production and upward migration of melanin and oxidation of premelanin

tan = dec penetration

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25
prac appli of tanning
examine skin phototype of pts
26
prac appli of erythema
know proper dosage - MED and duration
27
exp epidermal hyperplasia
thickening of superficial layer of skin; stratum corneum d/t cell proliferation occurs 72 hrs after UVR exposure
28
practical appli of epidermal hyperplasia
need progressive higher dose
29
exp vitamin D synthesis
converts provitamin D to active vitamin D
30
practical appli of vit D synthesis
indicated for psoriasis
31
exp bactericidal effect
promotes wound healing and desquamation of slough off dead cells
32
practical appli of bactericidal effect
UVR on open wounds
33
compare UVR and IRR in terms of effect
UVR - chemical IRR - thermal
34
compare UVR and IRR in terms of heat
UVR - no heat IRR - absorbed as heat
35
compare UVR and IRR in terms of distance to be absorbed
UVR - absorbed at 1-2 mm IRR - absorbed at 3 mm
36
compare UVR and IRR in terms of source
UVR - luminous IRR - luminous and non-luminous
37
compare UVR and IRR in terms of erythema
UVR - delayed erythema; dark IRR - immediate erythema; light
38
compare UVR and IRR in terms of how long is lasts
UVR - several days IRR - 20-30 mins
39
exp irradiance
intensity or power density; measured by UV sensor on device; I
40
unit for irradiance
mW/cm2
41
exp exposure radiation
treatment time; T
42
exp dose per treatment
amount of energy delivered to skin in a single treatment; Dt = I x T
43
unit for exposure radiation
seconds
44
unit for dose per treatment
mJ/cm2
45
exp cumulative dose
summation of all doses; Dc = EDt
46
unit for cumulative dose
J/cm2
47
relate irradiance and exposure time
according to bunsen-roscoe law - inverse relationship of irradiance and exposure
48
what is the preferred method to determine initial dose
minimal erythemal dose or MED
49
dose of UV rad will produce erythema after ______
8-24 hrs after exposure
50
what are the kinds of dose-response assessment
suberythemal dose (SED) minimal erythemal dose (MED) first deg erythema (E1) second deg erythema (E2) third deg erythema (E3)
51
formula for altering intensity
Inew = ( Iold x Dold2 ) x Dnew2
52
distance of appli for cold quartz
at least 1 in away from wound
53
distance of appli for hot quartz
initially 60-80 cm
54
distance is altered when duration has reached over _____
5 mins
55
NB-UVB used for subacute and chronic psoriasis or vitiligo
MED or E1
56
PUVA used for subacute and chronic psoriasis
E1 but E2 for heels and elbows
57
used in cystic acne or acne vulgaris for face, neck and chest
E1
58
used in cystic acne or acne vulgaris for back and shoulders
E2
59
rationale why UVR is used in psoriasis
dec DNA synthesis and proliferation of skin cells
60
rationale why UVR is used in acne
desquamation = new skin and antibacterial effect
61
indications of PUVA
psoriasis eczema urticaria cutaneous T-cell lymphoma some photosensitive disorders
62
what is PUVA
psoralen + UVA
63
used in non-infected open wounds
UVC - surgical incisions, pressure/venous/arterial ulcers
64
discuss treatment for granulation tissue
meaty red - no treatment or SED to MED only; no progression kc dont destroy the tissue
65
discuss treatment for decubitus ulcers
affecting epidermis/dermis - E1 muna tas E2
66
discuss treatment for surrounding skin of wound
MED daily
67
used in thin yellowish slough
E2 daily and unprogressed
68
used in definite green or yellow slough
E3 daily and unprogressed
69
used in black slough
E3 daily
70
UVR used for counter-irritation
E3
71
UVR used for alopecia
UVB at E1 or E2
72
UVR used for uremic pruritus
SED-UVB
73
contraindications of UVR
over eyes skin cancer pulmonary TB cardiac, liver or kidney disease SLE fever taking birth control pills
74
precautions of UVR
photosensitivity or allergy photosensitizing medications recent x-ray - 3-6 months UVR effects of previous treatment still present
75
adverse effects of UVR
burning premature aging of skin - actinic damage carcinogenesis eye damage - photokeratis, conjunctivis, cataracts
76
treatment for UV overdose
IRR for 20 mins every hour for 6-8 hrs
77
what to consider before treatment
phototesting for MED - volar FA or inner thigh charactersistcs and description of skin calcualtion of dosage area of appli progression
78
steps in determining dosage
determine MED via erythrometer - determine dosage - determine dosage for progression
79

pmod 3rd shift (5 decks)

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