From: eugene@amelia.nas.nasa.gov (Eugene N. Miya)
Subject: [l/m 4/15/92] Oak/Ivy		Distilled Wisdom (18/28) XYZ
Followup-To: poster
Organization: NAS Program, NASA Ames Research Center, Moffett Field, CA
Date: Tue, 18 Aug 92 11:20:06 GMT
Reply-To: eugene@amelia.nas.nasa.gov (Eugene N. Miya)

Panel 18

Subject: FAQ on Poison Oak/Ivy

Poison Oak and Ivy

Summary
   If you do nothing, it'll heal in two weeks.  If you try all these
   over the counter and/or natural remedies, wait 14 days.  If you go
   to the doctor for serious mind altering steroids, it's gone within
   a day.

What is it and how does it work?

   Various species of the genus Rhus.  The sap and crushed leaves
   contain a chemical which is absorbed by skin cells.  The body
   mounts an immune response to these contaminated cells.  Once begun,
   the reaction ends only when all the contaminated cells have been
   shed.  This is one argument for scratching as much as possible, at
   the expense of additional scarring.

What are effective treatments?

   There are a lot of conflicting suggestions for treatment.
   Antihistamines are either very effective or worthless.  If the
   affected area is small enough, self treatment with over the counter
   remedies can provide 'temporary relief'.  One cheap suggestion is
   to apply very hot (but not scalding) water to the area, which is
   supposed to provide several hours of relief by deadening the nerves
   in the area.  One person reported losing a lot of skin with this
   method.  Others report that the itching recurs worse than before,
   possibly due to increased blood flow in the area.  I did not try
   this method.

   Various over the counter remedies (rhuligel, caladryl, calamine
   lotion, benadryl) contain alcohol which appears to work by cooling
   and drying the area.  This is reputed to cause cracking and even
   more itching.  In my case, the itching returned very quickly.
   Hydrocortisone cream is supposed to be effective, although some
   people indicate that over the counter concentrations are too weak
   to be effective.  I observed no response to over the counter
   hydrocortisone.

   Symptoms may persist for up to two weeks after exposure.  None of
   the above remedies will reduce this time.

   For more serious or widespread cases, a doctor can prescribe
   steroids which apparently suppress the immune response to
   contaminated cells.  Topical steroid creams are less effective, but
   may be preferable because they aren't systemic (absorbed) (some
   people warn that this is not true when used in the quantities
   required for a large affected area).  Oral, systemic
   gluco-cortico-steroids may cause behavioral changes, but are
   effective and rapid (my symptoms disappeared within 24 hours).

How can I prevent this?

   Learn to recognize and avoid the plant.  If exposed, wash the
   affected area as quickly as possible with soap and cold water (hot
   water is reputed to cause the pores to open and allow the oak oil
   in).  A product called Tecnu is supposed to break down the active
   ingredient in the oil.  It's available at some drug stores, or from
   Solutions (1-800-342-9988).  It's supposedly recommended by power
   company linemen.  The oil is very easily spread, and can persist in
   crystalline form on clothing or other contacted items (including
   pets) for many months (years?), so you should wash anything you may
   have touched.  Scratching affected areas after symptoms develop can
   not spread the infection, but different levels of exposure, and
   secondary exposures, can cause delayed reactions (2-3 days) in
   adjacent areas, giving the impression of spreading.

   There are supposed to be naturopathic regimens to develop immunity
   to poison oak.  Some people are naturally immune.

   Under no circumstances should you burn the plant;
   the smoke is as potent as the plant itself.
   "Inhaling the smoke can produce a systemic reaction,
   including potentially serious lung inflammation."
	
References:
Medicine for Mountaineering.

From: Roni Burrows <AIVAB%ASUACAD.BITNET@CUNYVM.CUNY.EDU>
Subject:      Poison ivy treatment (Hot showers)

A ways back I EMAILed you a response to your posting on poison ivy.  I believe
that you responded inviting me to send more info (sorry, I lost my copy of
your response).  Here is a direct quote from my source.  I like the book;
it's easy to understand and not condescending.  The poison ivy - hot shower
treatment described works extremely well for me.  It has also helped relieve
itching from multiple mosquito bites.  Its main drawback is that it is a HOME
remedy - not very helpful on the trail.

>From "Take Care of Yourself - A Consumer's Guide to Medical Care," by Donald
M. Vickery, M.D. and James F. Fries, M.D., Addison-Wesley, 1977 (7th printing).

p. 132, Poison Ivy and Oak:
     "Poison Ivy and Poison Oak need little introduction.  The itching skin
lesions which follow contact with these and other plants of the Rhus
family are the most common example of a larger category of skin problems
known as "contact dermatitis."  Contact dermatitis simply means that
something has been applied to the skin which has caused the skin to
react to it.  An initial exposure is necessary to "sensitize" the
patient; a subsequent exposure will result in an allergic reaction if
the plant oil remains in contact with the skin for several hours.  The
resulting rash begins after 12 to 48 hours delay and persists for about
two weeks.  Contact may be indirect, from pets, contaminated clothing,
or smoke from burning Phus plants.  It can occur during any season.

Home Treatment:
     There are many approaches to the treatment of poison ivy.  The best
is to avoid the plants, which are hazardous even in the winter when they
have dropped their leaves.  Next best is to remove the plant oil from
the skin as soon as possible.  If the oil has been on the skin for less
than six hours, thorough cleansing with strong soap, repeated three
times, will usually prevent reaction.
     Many physicians recommend cool compresses of Burrow's Solution
(Domeboro, Bur-Veen, Bluboro) or Aveeno Bath(one cup to a tub full of
water).  The old standby, calamine lotion, is sometimes of help in early
lesions, but may spread the plant oil which is causing the irritation in
the first place.  Be sure to cleanse the skin, as above, even if you are
too late to prevent the rash entirely.  Another useful method of
obtaining symptomatic relief is the use of a hot bath or hot shower.
Heat releases histamine, the substance in the cells of the skin which
causes the intense itching.  Therefore, a hot shower or bath will cause
intense itching as the histamine is released.  The heat is gradually
increased to the maximum tolerable and continued until the itching has
subsided.  This process will deplete the cells of histamine and the
patient will often obtain eight hours of relief from the itching.  This
method has the advantage of not requiring frequent application of
ointments to the lesions and is a good way to get some sleep at night.
Poison ivy or oak will persist for the same length of time despite the
medication.  If secondary bacterial infection occurs, healing will be
delayed; hence scratching is not helpful.  Cut the nails to avoid damage
to the skin through scratching."

I hope this is of interest.

Roni Burrows                    |        ThE        |-------------------------|
aivab@asuvm.inre.asu.edu        |   uSuAL           | "I left my harp . . .   |
Arizona State University        |       DisCLAiMers |    in Sam Clam's Disco" |
Chemical,Bio,&Mat'ls Engineering| aPplY             |-------------------------|

TABLE OF CONTENTS of this chain:

18/ Poison ivy, frequently ask, under question		<* THIS PANEL *>
19/ Lyme disease, frequently ask, under question
20/ "Telling questions" backcountry Turing test
21/ AMS
22/ Words from Foreman and Hayduke
23/ A bit of song (like camp songs)
24/ What is natural?
25/ A romantic notion of high-tech employment
26/ Other news groups of related interest, networking
27/ Films/cinema references
28/ References (written)
1/ DISCLAIMER
2/ Ethics
3/ Learning I
4/ learning II (lists, "Ten Essentials," Chouinard comments)
5/ Summary of past topics
6/ Non-wisdom: fire-arms topic circular discussion
7/ Learning (3)
8/ Fletcher's Law of Inverse Appreciation and advice
9/ Water Filter wisdom
10/ Words from Rachel Carson
11/ Snake bite
12/ Netiquette
13/ Questions on conditions and travel
14/ Dedication to Aldo Leopold
15/ Leopold's lot.
16/ Morbid backcountry/memorial
17/ Information about bears
Newsgroups: rec.backcountry