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pmod 3rd shift > uvr > Flashcards

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
Q

prac appli of tanning

A

examine skin phototype of pts

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26
Q

prac appli of erythema

A

know proper dosage - MED and duration

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27
Q

exp epidermal hyperplasia

A

thickening of superficial layer of skin; stratum corneum d/t cell proliferation

occurs 72 hrs after UVR exposure

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28
Q

practical appli of epidermal hyperplasia

A

need progressive higher dose

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29
Q

exp vitamin D synthesis

A

converts provitamin D to active vitamin D

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30
Q

practical appli of vit D synthesis

A

indicated for psoriasis

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31
Q

exp bactericidal effect

A

promotes wound healing and desquamation of slough off dead cells

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32
Q

practical appli of bactericidal effect

A

UVR on open wounds

33
Q

compare UVR and IRR in terms of effect

A

UVR - chemical

IRR - thermal

34
Q

compare UVR and IRR in terms of heat

A

UVR - no heat

IRR - absorbed as heat

35
Q

compare UVR and IRR in terms of distance to be absorbed

A

UVR - absorbed at 1-2 mm

IRR - absorbed at 3 mm

36
Q

compare UVR and IRR in terms of source

A

UVR - luminous

IRR - luminous and non-luminous

37
Q

compare UVR and IRR in terms of erythema

A

UVR - delayed erythema; dark

IRR - immediate erythema; light

38
Q

compare UVR and IRR in terms of how long is lasts

A

UVR - several days

IRR - 20-30 mins

39
Q

exp irradiance

A

intensity or power density; measured by UV sensor on device; I

40
Q

unit for irradiance

A

mW/cm2

41
Q

exp exposure radiation

A

treatment time; T

42
Q

exp dose per treatment

A

amount of energy delivered to skin in a single treatment; Dt = I x T

43
Q

unit for exposure radiation

A

seconds

44
Q

unit for dose per treatment

A

mJ/cm2

45
Q

exp cumulative dose

A

summation of all doses; Dc = EDt

46
Q

unit for cumulative dose

A

J/cm2

47
Q

relate irradiance and exposure time

A

according to bunsen-roscoe law - inverse relationship of irradiance and exposure

48
Q

what is the preferred method to determine initial dose

A

minimal erythemal dose or MED

49
Q

dose of UV rad will produce erythema after ______

A

8-24 hrs after exposure

50
Q

what are the kinds of dose-response assessment

A

suberythemal dose (SED)

minimal erythemal dose (MED)

first deg erythema (E1)

second deg erythema (E2)

third deg erythema (E3)

51
Q

formula for altering intensity

A

Inew = ( Iold x Dold2 ) x Dnew2

52
Q

distance of appli for cold quartz

A

at least 1 in away from wound

53
Q

distance of appli for hot quartz

A

initially 60-80 cm

54
Q

distance is altered when duration has reached over _____

A

5 mins

55
Q

NB-UVB used for subacute and chronic psoriasis or vitiligo

A

MED or E1

56
Q

PUVA used for subacute and chronic psoriasis

A

E1 but E2 for heels and elbows

57
Q

used in cystic acne or acne vulgaris for face, neck and chest

A

E1

58
Q

used in cystic acne or acne vulgaris for back and shoulders

A

E2

59
Q

rationale why UVR is used in psoriasis

A

dec DNA synthesis and proliferation of skin cells

60
Q

rationale why UVR is used in acne

A

desquamation = new skin and antibacterial effect

61
Q

indications of PUVA

A

psoriasis

eczema

urticaria

cutaneous T-cell lymphoma

some photosensitive disorders

62
Q

what is PUVA

A

psoralen + UVA

63
Q

used in non-infected open wounds

A

UVC - surgical incisions, pressure/venous/arterial ulcers

64
Q

discuss treatment for granulation tissue

A

meaty red - no treatment or SED to MED only; no progression kc dont destroy the tissue

65
Q

discuss treatment for decubitus ulcers

A

affecting epidermis/dermis - E1 muna tas E2

66
Q

discuss treatment for surrounding skin of wound

A

MED daily

67
Q

used in thin yellowish slough

A

E2 daily and unprogressed

68
Q

used in definite green or yellow slough

A

E3 daily and unprogressed

69
Q

used in black slough

A

E3 daily

70
Q

UVR used for counter-irritation

A

E3

71
Q

UVR used for alopecia

A

UVB at E1 or E2

72
Q

UVR used for uremic pruritus

A

SED-UVB

73
Q

contraindications of UVR

A

over eyes

skin cancer

pulmonary TB

cardiac, liver or kidney disease

SLE

fever

taking birth control pills

74
Q

precautions of UVR

A

photosensitivity or allergy

photosensitizing medications

recent x-ray - 3-6 months

UVR effects of previous treatment still present

75
Q

adverse effects of UVR

A

burning

premature aging of skin - actinic damage

carcinogenesis

eye damage - photokeratis, conjunctivis, cataracts

76
Q

treatment for UV overdose

A

IRR for 20 mins every hour for 6-8 hrs

77
Q

what to consider before treatment

A

phototesting for MED - volar FA or inner thigh

charactersistcs and description of skin

calcualtion of dosage

area of appli

progression

78
Q

steps in determining dosage

A

determine MED via erythrometer - determine dosage - determine dosage for progression

79
Q
A

pmod 3rd shift (5 decks)

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