While winter nears, most outdoor enthusiasts are
squeaking out that last weekend of nice weather
before the snow begins to fall. But all over the country,
poison ivy, oak, and sumac are also reaching full
maturity and a case of dermatitis could put a damper
on your final fall weeks. Check out this case study to
brush up:
You take a group on a week-long backpacking trip in
Colorado backcountry. On the second day, after
setting up camp, a couple members of your party
leave the trail to spot some promising bouldering
areas. That night, one of the climbers, a 25-yr old
male, begins to complain of itching and quickly
develops a rash with fluid-filled vesicles. He quickly
identifies it as poison ivy, saying he's had a similar
rash before. How should you treat the following
concerns:
- Only the 25-yr old shows any presentation of
poison ivy exposure. Should you worry about the
others? If so, how can you minimize their reaction?
- You have, in your kit, both a topical steroid
cream and an oral steroid. Which is more effective?
- Your patient says that last time he had a very
severe rash, but nothing he considers very serious.
Do you have to worry about a potential evacuation?
Answers:
- A first exposure to poison ivy takes much
longer to present; the other members, especially
those who left the trail, could potentially develop a
reaction to the resin, urishiol in poison ivy, though they
may not present for up to 21 days. To minimize their
reaction, washing with rubbing alcohol is best or cold
water with mild hand soap if no alcohol is
available.
Though topical steroids can sooth itching, mostly
before vesicles develop, oral steroids are most
effective. The suggested dose for prednisone, an oral
steroid, is 60 mg for five days, then 40 mg for five
days, then 20 mg for five days. Stopping steroid
therapy can cause rebound dermatitis.
A second exposure to poison ivy can produce not
only a quicker reaction, but also a more severe
reaction. Though most cases can be managed in the
backcountry, evacuation is essential if the patient
develops respiratory or urinary obstruction or if a
severe rash develops over a large portion of the body
and does not respond to steroid therapy.
Of course, the best treatment is prevention. Help
those around you to recognize toxicodendrons like
poison ivy pictured above. Also, avoid a reaction by
wearing long clothing, staying on trails, and washing
thoroughly if you suspect an exposure. Enjoy!