Twelve questions on UVB phototherapy
UVB phototherapy
Created 2019.
This exercise will ask you a set of twelve questions on UVB phototherapy. Each question contains only one correct answer.
If you want to read up on it, you can do so by clicking on the link below.
Learning Objectives
- Describe a fluorescent low-pressure mercury type of UVB phototherapy unit
- Describe mechanism of action of UVB on skin diseases
- List safety measures for UVB phototherapy
- Describe how to measure minimal erythema dose
- Describe dose regimens for BB-UVB and for NB-UVB
- List complications of UVB treatment
Editor: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand
UVB phototherapy
Created 2019.
This exercise will ask you a set of twelve questions on UVB phototherapy. Each question contains only one correct answer.
If you want to read up on it, you can do so by clicking on the link below.
Learning Objectives
- Describe a fluorescent low-pressure mercury type of UVB phototherapy unit
- Describe mechanism of action of UVB on skin diseases
- List safety measures for UVB phototherapy
- Describe how to measure minimal erythema dose
- Describe dose regimens for BB-UVB and for NB-UVB
- List complications of UVB treatment
Editor: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand
1. The electromagnetic radiation waveband known as Ultraviolet-B (UVB) is:
a. 200–320 nm
b. 290–320 nm
c. 290–360 nm
d. 311–360 nm
2. UVB is greater:
a. At 1:30 pm in summer in New Zealand compared with earlier or later in the day
b. At lower altitudes compared with higher altitudes
c. Through window glass
d. At longer latitudes compared with shorter latitudes
3. Fluorescent UVB bulbs:
a. Have black identification markings
b. May be 8-foot long for tall people
c. Are available in cabinets with up to 56 bulbs
d. Produce a fixed radiance
4. UVB phototherapy:
a. 20 treatments have the same effect if delivered over 20 weeks as over 4 weeks
b. Clears 98% of chronic plaque psoriasis
c. Suppresses cell-mediated immune function
d. Results in peak erythema 24 hours after exposure
5. Patient safety requires:
a. The patient should wear their own sunglasses during treatment
b. Genitalia should be covered during treatment
c. The nurse should remain outside the treatment room
d. Maintaining a tan between treatments by sun bathing
6. Minimal erythema dose (MED) testing:
a. Gives predictable results according to clinical phototypes
b. MED values for different phototypes may overlap
c. Is performed on skin that has been regularly exposed to sunlight
d. Is best measured after 72 hours
7. Phototherapy for psoriasis:
a. The dose of UVB is measured in mJ/cm2
b. Should commence with the minimal erythema dose of UVB
c. Dose increments should be 5% for all skin types
d. Treatment should be delivered 7–8 times weekly
8. Erythema:
a. Treatment is not successful unless there is some erythema
b. If mild, you may continue to increase the dose of UVB according to schedule
c. If marked tenderness present, treatment can be continued
d. May indicate the patient is taking a photosensitising medication
9. Treatment interruptions:
a. Are a good idea to give the skin a chance to heal properly
b. May require an increase in dose on recommencing treatment
c. Should be dealt with by increasing percentage increments
d. Can result in relative resistance to treatment
10. Clearance of psoriasis with phototherapy:
a. Is defined as 75% clearance of plaques
b. Occurs in 90% of patients having 20 treatments of NB-UVB
c. May require 50% additional UVB to lower limbs
d. Is slower if emollients are applied to psoriasis
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