UV

Question 1

what wavelengths are correlated with UVA,B, and C

Answer 1

A = 320-400 nm
B = 280-320 nm
C = 185-280 nm

Question 2

what is the UV wavelength spectrum

Answer 2

200-400 nm

Question 3

physiological effects of UV light

Answer 3

absorbed 1-2 mm
erythema
epidermal thickening
pigmentation / Vitamin D
bactericidal effects
suppress circulating lymphocytes

Question 4

timeline associated with erythema

Answer 4

2-4 hrs after treatment, peak within 12 hrs

Question 5

what type of reaction occurs via UV light

Answer 5

photochemical reaction

Question 6

what device is used in UV therapy

Answer 6

mercury arc lamps
- either high or low pressure

Question 7

high pressure mercury lamps provide ______ UV light

Answer 7

full spectrum
UVA,UVB,UVC

Question 8

low pressure mercury arc lamps provide _____ UV light

Answer 8

UVC
at 185-254 nm

Question 9

what wavelengths are most effective at producing erythema

Answer 9

254-297 nm

Question 10

what wavelengths are most effective for producing bactericidal effects

Answer 10

250-270 nm

Question 11

UV inverse square law formula

Answer 11

E = I/D²

E - illumination intensity
I - lamp intensity
D = distance from source

Question 12

minimal erythemal dosage is based upon

Answer 12

the time it takes for erythema to disappear

Question 13

2.5 MED equals to

Answer 13

1 ED 1-3 days

Question 14

5 MED equals to

Answer 14

2 ED 10-14 days

Question 15

10 MED equals to

Answer 15

3 ED >14 days

Question 16

indications of UV

Answer 16

chronic stage psoriasis
chronic wounds
infected wounds
exfoliation
acne

Question 17

contraindications / precautions for UV

Answer 17

medications
foods
skin cancer
radiation treatment in area
fever
photosensitization
sun allergy
co-morbidities

Question 18

what medications contraindicate UV

Answer 18

thiazide diuretics
phenothiazines
sulfonylureas
tetracyclines
chemotherapeutics

Question 19

foods that contra indicate UV treatment

Answer 19

sensitivity to strawberries and eggs

Question 20

what co-morbidities contraindicate UV

Answer 20

lupus
sarcoidosis
acute psoriasis
renal/hepatic insufficiencies

Question 21

how administer UV therapy after determining MED

Answer 21

E1 for treatment areas <20% of body surface

E2 for treatment areas <250cm²

E3 for treatment areas <25cm²

Question 22

what do both the patient and therapist need to wear during UV therapy

Answer 22

goggles

Question 22

documentation of UV therapy

Answer 22

type of UV machine used

most recent MED measurement
– either every reassessment period, or if chronic each time of administration

body part treated

UV dosage (ED1-3)

pre/post treatment assessment
– 24 hours after