Card Set Information
What is UV used for?
chemical effects on skin, not thermal
How deep does UV penetrate skin?
2mm or less
How much UV rays come from the sun?
What are 2 types of artificial sources of UV?
What are some physiological effects?
hyperplasia (thickening of epidermis)
destruction of bacteria
formation of vit d
increased resistance to infection
What are some effects of excessive dosage?
symptoms of protein shock, pallor, shallow pulse, low BP
photosensitivity with drugs-HTN, gold, quinine
Which erythemal reaction has no effect?
suberythemal dose (SED)
irridation insufficient to cause reddening
usefule in photosensitization with UV
What type of erythemal reaction do we want to achieve?
minimal erythemal dose (MED)
slight reddening with peeling (appears within 8 hours, disappears withing 24 hours)
used for intial dosage of UV
What type of erythemal reaction has reddening that appears after a few hours (6ish) and lasts 1-3 days?
first degree erythemal dose (1ED)
What type of erythemal reaction is marked by reddening with considerable itching that subsides in 3 days (sunburn like)?
second degree erythemal dose (2ED)
appears in 2 hours, edema, peeling, pigmentation
What type of erythemal reaction produces severe reddening after 2hours and lasts several days; consists of blistering, peeling, and deep pigmentation?
third degree erythemal dose (3ED)
How do you perform a MED test?
apply strip (6holes) to an area not exposed to sunlight
set lamp 30inches away from surface, and perpendicular
expose first hole for 30 sec, then second for 30 sec..expose the last 4 holes 15 seconds each (total 120 seconds)
After giving a MED test, what should be done?
pt must check test area every 2 hours and report what each hole is doing
shortest dose to appear and disappear withing 24 hours is the MED
What are some indications?
general debility (try to make them hungry or something, get some sort of reaction)
What are some contradictions?
over the eyes
if getting xray txs or have within 3 months
very sensitive skin
if they have SLE (lupus)-very high sensitivity to light
What are some special precautions?
both you and pt must wear goggles
your sking will also be exposed and treated
CAREFULLY monitor times
treat burns if they occur
blondes/red heads/skin thin/old/young