Ultraviolet Radiation

Question 1

UV raidiation wavelength is from ___ nm to below ___nm

Answer 1

400 290

Question 2

3 bands of UV radiation

Answer 2

UVA
UVB
UVC

Question 3

UVA has a wavelength of ___-___nm
UVB has a wavelength of ___-___nm
UVC has a wavelength less than ___nm

Answer 3

320-400
290-320
290

Question 4

What effect does UVA have on the skin? UVB? UVC?

Answer 4

UVA produces fluorescence
UVB produces the most skin erythema
UVC is germicidal (chronic open wounds)

Question 5

When is UV radiation intensity at its greatest?

Answer 5

with high-powered lamp, close to patient, perpendicular to skin surface

Question 6

5 Effects of Ultraviolet Radiation

Answer 6

• Erythema production
• Tanning
• Epidural hyperplasia
• Vitamin D synthesis
• Bactericidal

Question 7

With ___ doses of UV radiation the immune responses is suppressed

Answer 7

low

Question 8

With ___ doses of UV radiation the immune response is activated.

Answer 8

high

Question 9

What skin conditions are indications for the use of UV radiation?

Answer 9

• Psoriasis
• Scleroderma
• Eczema
• Atopic dermatitis
• Cutaneous T-cell lymphoma
• Vitiligo
• Palmaplantar pustulosis

Question 10

What band of UV radiation is most commonly used for the treatment of chronic open wounds?

Answer 10

UVC

Question 11

How does UV help with wound healing?

Answer 11

It enhances epithelialization and destroys bacteria

Question 12

6 Contraindications for UV

Answer 12

• Irradiation of the eyes
• Skin Cancer
• Pulmonary Tuberculosis
• Cardiac, kidney or liver disease
• Systemic Lupus Erythematosus
• Fever

Question 13

5 Precautions for UV

Answer 13

• Photosensitizing medications
• Photosensitizing supplements
• Photosensitivity
• Recent X-ray therapy
• Too soon after previous dose

Question 14

4 Adverse Effects of UV Radiation

Answer 14

• Burning
• Premature aging of the skin
• Carcinogenesis
• Eye damage

Question 15

How do you determine a patient’s sensitivity to UV radiation?

Answer 15

Using a square grid pattern, expose different squares for extended periods of time

Question 16

What are the 5 dose responses?

Answer 16

• Suberythemal dose (SED)
• Minimal erythemal dose (MED)
• First-degree erythema (E1)
• Second-degree erythema (E2)
• Third-degree erythema (E3)

Question 17

Describe Suberythemal dose (SED)

Answer 17

There is no change in skin redness 24 hrs after UV exposure

Question 18

Describe Minimal erythemal dose (MED)

Answer 18

The smallest dose producing erythema within 8 hrs after exposure that disappears within 24 hrs after exposure

Question 19

Describe First-degree erythema (E1)

Answer 19

Definite redness with some mild desquamation appears within 6 hrs after exposure and lasts for 1-3 days. This dose is generally 2.5 times the MED

Question 20

Describe Second-degree erythema (E2)

Answer 20

Intense erythema with edema, peeling, and pigmentation appears within 2 hrs after exposure and is like a severe sunburn. This dose is generally 5 times the MED

Question 21

Describe Third-degree erythema (E3)

Answer 21

Erythema with severe blistering, peeling and exudation. This dose is generally 10 times the MED

Question 22

At which dosage should you treat your patient?

Answer 22

Minimal erythemal dose (MED)