61. URTICARIA Translate this page Atrás urticaria. La etiología de la urticaria suele ser muy variada, implicándose factores infecciosos, medicamentosos, inmunológicos o alimentarios. http://www.ondasalud.com/edicion/noticia/0,2458,4943,00.html

Newsletters Mapa del web Publicidad Niño ... Multimedia URTICARIA Imprimir Feedback Tratamiento · Personas que la padecen Arriba Arriba Arriba · Tratamiento Arriba Aviso Legal

62. Occupational/Environmental Health Resource: Educational urticaria. Occupational urticaria, when allergic is mediated by a type I mechanism like many instances of occupational asthma, with which it can coexist. http://www.agius.com/hew/resource/skin.htm

Occupational and Environmental Skin Disease The lungs and skin (as well as the nose and eyes) are the organs of first contact for most environmental exposures (excluding ingestion). This page complements other modes of learning about the skin's health in relation to occupational and environmental hazards. Relevant Fundamentals of Skin Structure and Function The skin is not an absolutely impermeable membrane. It consists of a layer of horny dead cells overlying living (and very vulnerable) ones. It is fairly impermeable to water splashes but continuous immersion in water with friction will macerate it. Organic fat solvents can go through the skin fairly quickly. Inorganic caustics (strongly alkaline compounds) will damage the skin very readily by sparifying fat and hydrolysing protein. The skin has a very good capacity to regenerate provided the deepest layers are not irretrievably damaged. However while it is still damaged and not yet fully healed it remains vulnerable to damage and can be made worse by many agents which the normal skin could easily have withstood. Health effects on the skin Acute corrosion Obviously strong caustics, acids or similar substances will corrode the skin severel

63. Singapore Family Physician Occupational dermatoses can also present in other forms, such as contact urticaria, disorders of pigmentation and skin cancers, although less commonly. http://www.cfps.org.sg/sfp/21/213/articles/e213115.html

Journal Present Issue Past Issue College Mirror Present Issue Past Issue Back to College's Website THE SINGAPORE FAMILY PHYSICIAN This site is supported by Health ONE THE WORK ENVIRONMENT AND THE SKIN D Koh, C L Goh INTRODUCTION The effects of the work environment on the skin are rarely life threatening. However, they can cause much morbidity and suffering to the workers, and are a significant cause of decreased productivity and sickness absence in industry( Occupational dermatoses are defined as any pathological conditions of the skin for which job exposure can be shown to be a major direct or contributory factor( EPIDEMIOLOGY OF OCCUPATIONAL DERMATOSES In a reported series of 1,727 cases of occupational dermatoses which were confirmed by the Ministry of Labour in Singapore between 1983 to 1987, contact dermatitis was the most common presentation of occupational dermatose3. It accounted for 86% of all cases. About one fifth of the cases were from the construction industry, while the rapidly expanding electronics industry contributed to 15% of all cases. Many of these cases were assessed in a government skin hospital. A published series of 557 patients with occupational dermatoses seen at a Singapore government skin hospital between 1984 and 1985 reported that the majority of cases were contact dermatiti4. Irritant contact dermatitis was the most predominant (56%) followed by allergic contact dermatitis (39%). A small proportion (5%) of the cases were non-contact dermatitis, such as fibre glass dermatoses, miliaria and oil folliculitis. Most of the affected workers were from the construction (30%), metal and engineering (21%), electrical and electronic (16%), transport (6%) and food catering (4%) industries. Cutting fluids, oil, cement, solvents, detergents and soldering flux were the commonest occupational irritants. The common occupational allergens included chromates, rubber chemicals, resins, nickel and cobalt. A few workers had contact urticana to proteinaceous foods.

64. Eshdv - The History Of Urticaria And Angioedema 2000 The History of urticaria and Angioedema. Scotland . The term urticaria was later accepted by Peter Frank in Vienna and other centres. http://www.chez.com/sfhd/ecrits/urtic.htm

ESHDV Special Annual Lecture, Geneva, October 11th, 2000 The History of Urticaria and Angioedema Professor Lennart Juhlin, Department of Dermatology, University Hospital, Uppsala, Sweden Probably the most early description of the disease we today call urticaria is found in "The Yellow Emperor's Inner Classic", Huang Di Nei Jing, which was written sometimes between 1000-200 years before Christ ( ). In chapter 64 of Basic questions (Sin Wen) urticaria is called "Feng Yin Zheng" which means wind-type concealed rash. This is still the Chinese word for urticaria which was thought to be due to excess in lesser Yin which causes obstruction of fluid in the skin. Hippokrates who lived 460-377 BC described elevated itching lesions caused by nettles and mosquitoes which he called knidosis after the Greek word for nettle (knido). He also mentions that the weals can occur in patients with gastrointestinal disorders but then often with less itching. The same name was again introduced by Jean-Louis Alibert in Paris in his book on skin diseases published in 1833 ( ). Hebra used the term knidosis for the chronic type of nettle rash whereas in Andrew's and Domonko's textbook from 1963 it is used synonymously with urticaria.

65. Solar Urticaria Solar urticaria (SU) is an abnormal reaction to sunlight or artificial light. Solar urticaria. Written by Professor James Ferguson, consultant dermatologist. http://www.netdoctor.co.uk/diseases/facts/solarurticaria.htm

NetDoctor.co.uk Home News and features News Newsletter Features Encyclopaedia Diseases Examinations Medicines Premium services SMS services StayQuit thediet Health centres Allergy and asthma Children's health Depression Eczema ... All health centres Discussion and support Discussion forums Support groups Services Ask the doctor Find a hospital Search Medline Test yourself Information About NetDoctor Commercial opportunities NetDoctor.com Solar urticaria Professor James Ferguson , consultant dermatologist What is solar urticaria? Solar urticaria (SU) is an abnormal reaction to sunlight or artificial light. When exposed to light, the skin cells of someone with solar urticaria release potent chemicals (including histamine), causing their blood vessels to open and fluid to collect within the skin. Their skin feels itchy and has red patches, which may be swollen. These may look like weals or a nettle rash, and can take up to an hour to appear after exposure to light, then coming on quickly and settling within a similar period. There is no permanent change to the skin. Is solar urticaria serious?

66. HON Allergy Glossary Urticaria HON Allergy Glossary, urticaria urticaria is a skin condition, characterized by the development of itchy, raised white lumps surrounded by an area of red http://www.hon.ch/Library/Theme/Allergy/Glossary/urticaria.html

Allergy : A B C ... W X Y Z Pollen Calendar More on this topic Relevant sites from HON's MedHunt: Urticaria Hives Atopic dermatitis Dermographism Multimedia from HONselect: Urticaria image (www.dermnet.org.nz) The 8th World Conference on the Internet and Medicine Internet in Health for All www.mednet2003.org 4 - 7 December 2003 External survey "Questionnaire on mood" conducted by the "IMSP- Faculty of Medicine - University of Geneva" Urticaria Hives Urticaria is a skin symptom that accompanies many allergic disorders . It is a relatively common disorder caused by localized mast-cell degranulation, with resultant dermal venular hyperpermeability culminating in pruritic wheals. Mostly results from an antigen-induced ( pollens foods drugs insect venom ) release of histamine and other vasoactive amines via sensitization with specific IgE antibodies. Most individual lesions develop and fade within 24 hours. Allergic skin diseases such as urticaria and angioedema as well as atopic dermatitis are not clearly defined as true allergic diseases. Urticaria and angioedema are both due to excessive mast cell activity in the skin. Chronic urticaria and angioedema are seldom due to a definable

67. Nældefeber (Urticaria) Nældefeber (urticaria). I omkring 90 procent af tilfældene er der ingen påviselig årsag, denne type kronisk nældefeber kaldes (idiopatisk urticaria). http://www.netdoktor.dk/sygdomme/fakta/naeldefeber.htm

i NetDoktor i Fagbogen NetDoktor.dk Forside Nyheder Genveje Babyklub Fagbogen Leksikon Sygdomme Medicin Symptomer Sundhed Emner Inkontinens Mave og tarm Psoriasis Rygestop ... Patientforeninger Service Test dig selv Information Kontakt NetDoktor Om NetDoktor ND i andre lande Af Flemming Andersen allergisk respons NSAID antibiotika og allergisk virus bakterie infektioner). hudlidelser sollys , tryk, varme eller vand. Hvad kan fremkalde symptomerne? madvarer , pollen, svampesporer) Infektioner (virus, parasitter eller bakterier) sol , vand, sved, tryk) Giftstoffer (konserveringsmidler og farvestoffer, insektstik Systemsygdomme ( thyreotoksikose mad der giver udslet. Vanskelighed ved at sove , irritabilitet Udsigt for fremtiden Hvilken medicin kan der gives? Medicin som kan anvendes: Midler mod allergi Tavegyl Polaramin Phenergan Prometazin 'ERA' ... Mildin Sidst opdateret: GENVEJE: Babyklub Fagbogen LEKSIKON: Sygdomme Medicin Symptomer Sundhed EMNER: Inkontinens Mave og tarm Psoriasis Rygestop ... Patientforeninger SERVICE: Test dig selv INFORMATION: Kontakt NetDoktor Om NetDoktor ND i andre lande Brugerbetingelser: Vigtige juridiske informationer ... fortrolighedspolitik The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care or attention by a qualified practitioner. The materials in this web site cannot and should not be used as a basis for diagnosis or choice of treatment. Click here - Conditions for use - Important legal information.

68. AllRefer Health - Hives (Urticaria) Hives (urticaria) information center covers causes, prevention, symptoms, diagnosis, treatment, incidence, risk factors, signs, tests, support groups http://health.allrefer.com/health/hives-info.html

AllRefer Channels :: Yellow Pages Reference Health Home ... Contact Us Quick Jump ADD/ADHD Allergies Alzheimer's Disease Arthritis Asthma Back Pain Breast Cancer Cancer Colon Cancer Depression Diabetes Gallbladder Disease Heart Attack Hepatitis High Cholesterol HIV/AIDS Hypertension Lung Cancer Menopause Migraines/Headaches Osteoporosis Pneumonia Prostate Cancer SARS Stroke Urinary Tract Infection 1600+ More Conditions Alternative Medicine Health News Symptoms Guide Special Topics ... Medical Encyclopedia You are here : AllRefer.com Health Hives Hives Definition Prevention Treatment Expectations or Prognosis ... Go To Main Page Alternate Names : Urticaria Definition Hives are raised, often itchy red welts on the surface of the skin. They can be an allergic reaction to food, medicine, or other substance. Hives (Urticaria) - Close-Up Hives Food Allergies Hives (Urticaria) on the Arm Hives (Urticaria) on the Chest Hives (Urticaria) - Close-Up Hives (Urticaria) on the Trunk Hives (Urticaria) on the Back and Buttocks Hives (Urticaria) on the Back Hives (Urticaria) on the Chest Hives are very common, especially in people who have experienced other allergic reactions, like hay fever, and are sometimes hereditary. When you have an allergic reaction to any substance, histamine and other chemicals are released into your bloodstream. These chemicals cause itching, swelling, hives, and other symptoms.

69. AllRefer Health - Urticaria Pigmentosa (Mastocytoma, Mastocytosis) urticaria Pigmentosa (Mastocytoma, Mastocytosis) information center covers causes, prevention, symptoms, diagnosis, treatment, incidence, risk factors, signs http://health.allrefer.com/health/urticaria-pigmentosa-info.html

AllRefer Channels :: Yellow Pages Reference Health Home ... Contact Us Quick Jump ADD/ADHD Allergies Alzheimer's Disease Arthritis Asthma Back Pain Breast Cancer Cancer Colon Cancer Depression Diabetes Gallbladder Disease Heart Attack Hepatitis High Cholesterol HIV/AIDS Hypertension Lung Cancer Menopause Migraines/Headaches Osteoporosis Pneumonia Prostate Cancer SARS Stroke Urinary Tract Infection 1600+ More Conditions Alternative Medicine Health News Symptoms Guide Special Topics ... Medical Encyclopedia You are here : AllRefer.com Health Urticaria Pigmentosa Urticaria Pigmentosa Definition Treatment Expectations or Prognosis Complications ... Go To Main Page Alternate Names : Mastocytoma, Mastocytosis Definition Urticaria pigmentosa is a disease that produces skin lesions and intense itching . If the lesions are rubbed, hives may form on the site. Dermatographism - Close-Up Dermatographism on the Arm Urticaria Pigmentosa in the Armpit Mastocytosis, Diffuse Cutaneous Urticaria Pigmentosa on the Chest Urticaria Pigmentosa - Close-Up Dermatographism on the Back Urticaria pigmentosa is one of several forms of mastocytosis, which is caused by excessive numbers of inflammatory cells (mast cells) in the skin. Other forms include solitary mastocytoma (a single lesion) and systemic mastocytosis (involvement in organs other than the skin).

70. Auckland Allergy Clinic - Urticaria And Angioedema urticaria Angioedema. urticaria, commonly known as hives is characterised by transient, itchy, oedematous wheals or red papules. http://www.allergyclinic.co.nz/guides/32.html

Urticaria, commonly known as hives is characterised by transient, itchy, oedematous wheals or red papules. The important thing that distinguishes it from other skin conditions is the transient nature and the intense pruritus. Individual lesions should last no longer than 24 hours and disappear without leaving any marks. Deeper swellings, known as angioedema, are most often found in the mouth, eyelids, or genitalia, but may occur anywhere. Angioedema is associated with urticaria in about 40% of cases or occurs on its own in 10% of cases. Prevalence Causes of Acute Urticaria Idiopathic in up to 50% of cases Foods : fruits (eg, strawberries), milk, eggs, seafood, nuts, and spices, Drugs: Viral Infections: This is a common, but poorly recognised cause of acute urticaria, especially in children. Often antibiotics are blamed for this reaction. Wasp or bee sting Blood products Chronic Urticaria Chronic urticaria (lasting more than 6 weeks) is much more troublesome than acute urticaria. Recent studies using an internationally recognised quality of life questionnaire, the Nottingham health profile, have highlighted the disability of patients with chronic urticaria, including loss of sleep and energy, social isolation, altered emotional reactions, and difficulties in aspects of daily living. The disability is of the same order as that experienced by patients with sever chronic ischaemic heart disease.

71. Urticaria, Papular urticaria, Papular Important It is possible that the main title of the report urticaria, Papular is not the name you expected. Please http://my.webmd.com/hw/allergies/nord248.asp

var guid_source = ""; var guid_source_id = ""; //unused var encodedurl = ""; WebMD Today Home WebMD News Center Member Services WebMD University My WebMD Find a Physician Medical Info Check Symptoms Medical Library Quizzes, Calculators Clinical Trials ... Women, Men, Lifestyle Who We Are About WebMD Site Map You are in Choose a Topic All Conditions ADD/ADHD Allergies Alzheimer's Arthritis Asthma Back Pain Breast Cancer Cancer Dental Depression Diabetes Eye Health Heart Disease Hepatitis HIV/AIDS Hypertension Men's Conditions Mental Health Migraines/Headaches Multiple Sclerosis Osteoporosis Parkinson's Sexual Conditions Stroke Weight Control Women's Conditions Health Topics Symptoms Medical Tests Medications ... For a Complete Report Urticaria, Papular Important It is possible that the main title of the report Urticaria, Papular is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report. Synonyms Angioedema and Urticaria Giant Urticaria Hives, Giant Lichen Urticatus Quincke Syndrome Urticaria, Papular

72. Urticaria, Physical urticaria, Physical Important It is possible that the main title of the report urticaria, Physical is not the name you expected. http://my.webmd.com/hw/allergies/nord250.asp

var guid_source = ""; var guid_source_id = ""; //unused var encodedurl = ""; WebMD Today Home WebMD News Center Member Services WebMD University My WebMD Find a Physician Medical Info Check Symptoms Medical Library Quizzes, Calculators Clinical Trials ... Women, Men, Lifestyle Who We Are About WebMD Site Map You are in Choose a Topic All Conditions ADD/ADHD Allergies Alzheimer's Arthritis Asthma Back Pain Breast Cancer Cancer Dental Depression Diabetes Eye Health Heart Disease Hepatitis HIV/AIDS Hypertension Men's Conditions Mental Health Migraines/Headaches Multiple Sclerosis Osteoporosis Parkinson's Sexual Conditions Stroke Weight Control Women's Conditions Health Topics Symptoms Medical Tests Medications ... For a Complete Report Urticaria, Physical Important It is possible that the main title of the report Urticaria, Physical is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report. Synonyms Autographism Physical Allergy Urticaria Disorder Subdivisions Aquagenic Urticaria Cold Urticaria Dermatographia Dermographism General Discussion Physical Urticaria is a condition in which red (erythematous) allergic skin lesions and itching (pruritus) are produced by exposure to cold temperatures, water, or mild trauma. The disorder occurs most commonly in infants.

73. Urticaria - Información General Translate this page urticaria - Información general. Muchas sustancias, llamadas alergenos, pueden provocar una respuesta alérgica que cause urticaria. Los alergenos comunes son http://pcs.adam.com/ency/article/000845.htm

Regresar a " - " Partes del cuerpo Enfermedades Lesiones Envenenamiento Temas especiales ... V W X Y Z Enfermedades ... Z Urticaria - Información general Información general Prevención Síntomas Tratamiento Nombres alternativos: Ronchas. Definición: Verdugones de diversos tamaños enrojecidos y elevados que aparecen en la superficie de la piel, que por lo general causan prurito y están asociadas con una reacción alérgica y liberación de histamina o con anomalías en el sistema de complemento o en el sistema de quininas (partes del sistema inmunológico). Causas, incidencia y factores de riesgo: Casi una de cada cinco personas experimentan urticaria (ronchas) en algún momento de su vida, aunque son más comunes en las personas con otras reacciones alérgicas , como la fiebre de heno y angioedema . Los verdugones aparecen en la superficie de la piel en forma de parches. La liberación de histamina y de otras sustancias químicas en el torrente sanguíneo, asociada a la respuesta alérgica , causa prurito , inflamación localizada y otros síntomas.

74. Tuotromedico: Urticaria Física Translate this page La urticaria es la aparición de lesiones en la piel con eritema ( color rojo), formación de habones (elevación de la piel más pálida), y picor que puede http://www.tuotromedico.com/temas/urticaria_fisica.htm

Otros Temas de Dermatología Acné Candidiasis Cómo Tomar el Sol Condiloma Acuminado Dermoabrasion. Lifting Facial Escabiosis. Sarna Exantemas Infantiles Exantemas por el Sol Fiebre Aftosa Fotosensibilidad a Medicamentos Fotosensibilidad a Plantas Hiperhidrosis. Sudoración Hongos en la Piel Ladillas Lifting Facial Lupus Eritematoso Diseminado Melanoma Molusco Contagioso Pie de Atleta Psoriasis Queloide Reacciones por el Sol Sudoración. Hiperhidrosis Pregunte al doctor Consulte al Dermatólogo Colabora URTICARIA FÍSICA DENOMINACIÓN DEFINICION ... DENOMINACIÓN urticaria, urticaria colinérgica, dermografismo, urticaria facticia, urticaria a frigore. DEFINICIÓN La urticaria es la aparición de lesiones en la piel con eritema (color rojo), formación de habones (elevación de la piel más pálida), y picor que puede aparecer localmente o de forma generalizada por todo el cuerpo. Las urticarias cuyo factor causal son los estímulos físicos, calor, frío, rascado, presión, etc ... son el grupo que se denomina como urticaria física. Constituyen la mayor parte de las urticarias crónicas de causa conocida. CARACTERÍSTICAS ESPECIALES Son clínicamente cuantificables ó medibles, ya que los estímulos que las provocan también lo son para reproducirlas en el diagnóstico.

75. Asthma & Allergy Associates Of Florida (Miami-Dade County) Chronic Hives (urticaria) A Guide For Sufferers. In summary, the great majority of cases of chronic hives (urticaria) have no cause. http://www.allergyweb.com/hives_pt.asp

Public/Patient Information Health Professional Information Office Directions and Hours About Our Staff ... Pollen Count Chronic Hives (Urticaria) - A Guide For Sufferers Likely the most distressing problem Allergy/Immunologists and Dermatologists see in their patients, is hives or urticaria. In most people hives are self-limited, only lasting a few weeks. In these self-limited cases, a theory is that the hives might be caused by a virus. The definition of urticaria or hives is that it is a rash with the following characteristics: they are red to pink in color, their shape varies from small bumps to blotchy or streaky areas, they are very itchy, and they appear and disappear at irregular time intervals - when they disappear, they do so without a trace. Hives can sometimes be accompanied by swelling of areas of the body, such as the lips, tongue, and hands - a condition called angioedema. The information below pertains to both hives and angioedema. Hives can occur as an allergic reaction to a variety of things (foods, insect stings, medications - especially aspirin or motrin-type drugs). In this case, the patient usually figures out the association by themselves, and they never bother coming to a specialists office. When hives are caused by an allergic reaction to a substance, they usually break out within one hour of the exposure. Also, the hives usually occur each time the person is exposed to the particular substance. However, we most often see people who have chronic urticaria or hives, defined as hives lasting longer than 6 weeks. This is a much more vexing problem for both the patient and the doctor. Patients like this come in miserable and worried with this problem, often having seen multiple specialists. Neither the patient or the doctor can determine the cause of the hives. Patients will often say "it has got to be something causing these hives." The truth is hard to accept for some patients.

76. Allergic Diseases Resource Center: Urticaria And Angioedema urticaria and Angioedema Synopsis. Causes. Acute urticaria. Acute urticaria, which is an allergic (IgEmediated) reaction, is common in both children and adults. http://www.worldallergy.org/professional/allergic_diseases_center/urticaria/urti

Health Professionals Receive the E-Letter Allergic Diseases Resource Center WAO Congresses WAO Educational Programs ... Home Urticaria and Angioedema: Synopsis Select One Definitions Symptoms Classification Causes Treatment Urticaria and Angioedema: Global Overview Printer-friendly version Definitions Urticaria is a transient erythematous swelling of the skin, associated with itching, which usually resolves within 24 hours. Angioedema (previously known as angioneurotic edema) is characterized by swellings caused by edema in the deeper dermal, cutaneous and sub-mucosal tissue. Symptoms Urticarial lesions itch, have a central white wheal that is elevated, and are surrounded by an erythematous halo. The lesions are typically rounded and circumscribed. Characteristically, hives should blanch with pressure; they generally resolve within 24 hours, leaving no residual change to the skin. The redness, which is mediated by local neural reflexes, is due to dilated blood vessels in superficial layers of the skin; the wheal is due to leakage of these vessels as fluid extravasates and compresses the vessels beneath it so that the central area appears clear. Swelling of deeper layers of the skin, angioedema, commonly accompanies urticaria (

77. Workers At Increased Risk For Contact Urticaria A table of high risk occupations for contact urticaria and the associated chemicals or biological agents for each occupation. Contact urticaria Caused by Food http://www.haz-map.com/urticari.htm

This table depicts some of the most common causes of occupational contact urticaria and the occupations at highest risk. Ammonia Persulfate AP Flour Flour alpha-Amylase a-Am CXase Handling of Foodstuffs Food Cow Dander Cow Grain Latex Ltx Acrylate Resins Acr Epoxy Resins Epx AP Flour a-Am CXase Food Cow Grain Ltx Acr Epx Hairdressers x x Bakers x x x Processed Food Preparers x Food Workers x Dairy Workers x x Agricultural Workers x x Medical Workers x Dental Workers x x x Electronics Workers x x Main Source of Information for the Table: Kanerva L, Tiikkanen J, Jolanki R, Estlander T. Statistical data on occupational contact urticaria. Contact Dermatitis What Is the Relative Incidence of Contact Urticaria? The paper cited above describes 815 cases of occupational contact urticaria that were reported during 1990-1994 to the Finnish Register of Occupational Diseases. During that same time period, 1944 cases of occupational allergic contact dermatitis were reported. Therefore, the evidence from Finland suggests that contact urticaria comprises approximately 30% (815 / 2759) of the total allergic work-related dermatoses.

78. Urticaria And Angioedema urticaria and Angioedema. What is urticaria? Angioedema generally lasts longer than urticaria, but the swelling usually goes away in less than 24 hours. http://www.clevelandclinic.org/health/health-info/docs/1900/1960.asp?index=8630

79. Electronic Textbook Of Dermatology--Botanical Dermatology , Contact Urticaria Botanical Dermatology. CONTACT urticaria. Not surprisingly, the plant family Urticaceae is the most notorious family for causing urticaria. http://www.telemedicine.org/botanica/bot2.htm

Botanical Dermatology CONTACT URTICARIA 'Urticaria' is derived from the Latin term urtica , meaning nettle, a plant with toothed leaves covered with hairs that contain a stinging fluid. Urtica is further derived from the Latin uro Urticaceae is the most notorious family for causing urticaria. TOXIN-MEDIATED URTICARIA ( TMU ) Toxin-mediated (non-immunologic) contact urticaria occurs without prior sensitization in most individuals who contact plants such as nettles. Most cases of contact urticaria due to plants are toxin-mediated and do not involve a Type I hypersensitivity reaction. Such plant species possess sharp hairs known as trichomes on the surfaces of leaves and stems. The proximal silicaceous hair attaches to a distal calcified portion with a terminal bulb. When rubbed against, the bulb is dislodged at a predetermined line from the end of the hair revealing a beveled, hypodermic needle-like, silicaceous hollow. These release irritant chemical cocktails (containing histamine, acetylcholine, and 5-hydroxytryptamine) that supposedly act as a defense mechanism against plant-eaters. These plants have been used since antiquity as counterirritants in folk medicine.

80. Pediatrics In Review -- Sign In Page urticaria. urticaria results from transient extravasation of plasma into the dermis that causes a wheal characterized by tense edema with or without redness. http://pedsinreview.aappublications.org/cgi/content/full/19/7/240

HOME HELP FEEDBACK SUBSCRIPTIONS ... SEARCH QUICK SEARCH: [advanced] Author: Keyword(s): Year: Vol: Page: This item requires a subscription. If you have an individual print subscription to Pediatrics in Review , online access is included. Full Text Urticaria Weston and Badgett Pediatrics in Review. PDF Version of this Article Email this article to a friend Rapid Responses: Submit a response to this article Similar articles found in: Pediatrics in Review Online PubMed PubMed Citation Search PubMed for articles by: Weston, W. L. Badgett, J. T. Alert me when: new articles cite this article Download to Citation Manager Collections under which this article appears: Skin Disorders To view this item, select one of the options below: Sign In: Please use your AAP ID Number or Temporary Activation Code for your User Name. User Name Sign in without cookies. Can't get past this page? Help with Cookies. Need to Activate? Password Forgot your user name or password? Purchase Short-Term Access Pay per Article - You may access this article (from the computer you are currently using) for 2 days for US$12.00.

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