Cold urticaria

Template:Short description Template:Infobox medical condition (new) Cold urticaria (essentially meaning cold hives) is a disorder in which large red welts called hives (urticaria) form on the skin after exposure to a cold stimulus.<ref>Template:Cite journal</ref> The hives are usually itchy and often the hands, feet and other parts of the body will become itchy and swollen as well. Hives vary in size from about Template:Val in diameter to as big as about Template:Val or larger.

This disorder, or perhaps two disorders with the same clinical manifestations, can be inherited (familial cold urticaria) or acquired (primary acquired cold urticaria). The acquired form is most likely to begin between ages 18 and 25, although it can occur as early as 5 years old in some cases. Life-threatening risks include suffocation resulting from swollen tissue (pharyngeal angioedema) induced by cold foods or beverages, drowning after shock from swimming in cold water, and anaphylactic shock.<ref name="pmid17355280">Template:Cite journal</ref>

Types

Cold urticaria may be divided into the following types:<ref name="Bolognia">Template:Cite book</ref>

Primary cold contact urticaria

Primary cold contact urticaria is a cutaneous condition characterized by wheals, and occurs in rainy, windy weather, and after swimming in cold water and after contact with cold objects, including ice cubes.<ref name="Bolognia"/>

Secondary cold contact urticaria

Secondary cold contact urticaria is a cutaneous condition characterized by wheals, due to serum abnormalities such as cryoglobulinemia or cryofibrinogenemia are extremely rare, and are then associated with other manifestations such as Raynaud's phenomenon or purpura.<ref name="Bolognia"/>

Reflex cold urticaria

Reflex cold urticaria is a cutaneous condition in which generalized cooling of the body induces widespread welting.<ref name="Bolognia"/>

Familial cold urticaria

Familial cold urticaria (also properly known as familial cold autoinflammatory syndrome, FCAS) is an autosomal dominant condition characterized by rash, conjunctivitis, fever/chills and arthralgias<ref>Template:Cite journal</ref> elicited by exposure to cold – sometimes temperatures below Template:Convert.<ref name="Bolognia"/><ref name="Andrews">Template:Cite book</ref>

It has been mapped to CIAS1<ref name="pmid11687797">Template:Cite journal</ref> and is a slightly milder member of the disease family including Muckle–Wells syndrome and NOMID. It is rare and is estimated as having a prevalence of 1 per million people and mainly affects Americans and Europeans.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

FCAS is one of the cryopyrin-associated periodic syndromes (CAPS) caused by mutations in the CIAS1/NALP3 (aka NLRP3) gene at location 1q44.<ref name="CAPS">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

The effect of FCAS on the quality of life of patients is far reaching. A survey of patients in the United States in 2008 found that "[t]o cope with their underlying disease and to try to avoid symptomatic, painful, flares patients reported limiting their work, school, family, and social activities. Seventy-eight percent of survey participants described an impact of the disease on their work, including absenteeism and impaired job advancement; frequently, they quit their job as a consequence of their disease".<ref>Template:Cite journal</ref>

Treatment using anakinra (Kineret) has been shown effective for FCAS, although this does mean daily injections of the immunosuppressant into an area such as the lower abdomen.<ref name="Kineret FCAS">Template:Cite journal</ref><ref name="Kineret FCAS Rheuma">Template:Cite journal</ref> The monoclonal antibody canakinumab (Ilaris) is also used.<ref>Template:Cite journal</ref>

Signs and symptoms

File:Cold allergy symptoms.jpg

Hives on the back from exposure to cold air on an individual with cold allergy. The hives were induced by riding a stationary bike shirtless for an hour next to a door cracked open on a cool day. The temperature of the air flowing in was around Template:Convert. The lighter band at chest height was covered by a heart rate monitor strap.

When the body is exposed to the cold in individuals affected by the condition, hives appear and the skin in the affected area typically becomes itchy. Hives result from dilation of capillaries which allow fluid to flow out into the surrounding tissue which is the epidermis. They resolve when the body absorbs this fluid.Template:Citation needed The border of a hive is described as polycyclic, or made up of many circles, and changes as fluid leaks out and then is absorbed.<ref>Template:Cite journal</ref> Pressing on a hive causes the skin to blanch (turn pale as blood flow is interrupted), distinguishing it from a bruise or papule.

Hives may appear immediately or after a delay.<ref>Template:Cite book</ref> Hives can last for a few minutes or a few days, and vary from person to person. Also, a burning sensation occurs. A serious reaction is most likely to occur for patients where the hives occur with less than three minutes of exposure (during a cold test).<ref>Template:Cite journal</ref>

Cause

The hives are a histamine reaction in response to cold stimuli, including a drastic drop in temperature, cold air, and cold water. There are many causes for cold hives, most are idiopathic (meaning they have no known cause). Some rare conditionsTemplate:Specify can cause cold hives, and it can be useful to test for these conditions if the cold hives are in any way unusual.

Scientists from the USA National Institutes of Health have identified a genetic mutation in three unrelated families that causes a rare immune disorder characterized by excessive and impaired immune function: immune deficiency, autoimmunity, inflammatory skin disorders and cold-induced hives (cold urticaria).

"The mutation discovered occurs in a gene for phospholipase C-gamma2 (PLCG2), an enzyme involved in the activation of immune cells. The investigators have named the condition PLCG2-associated antibody deficiency and immune dysregulation, or PLAID."<ref>Template:Cite news</ref>{{#if:|{{#if:|}}

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Diagnosis

Diagnosis is typically obtained by an allergist or other licensed practitioner performing a cold test. During the cold test, a piece of ice is placed inside a thin plastic bag and held against the forearm, typically for 3–4 minutes.<ref>Template:Cite book</ref> A positive result is a specific looking mark of raised red hives. The hives may be the shape of the ice, or it may radiate from the contact area of the ice.<ref name=":0">Template:Cite journal</ref> However, while these techniques assist in diagnosis, they do not provide information about temperature and stimulation time thresholds at which patients will start to develop symptoms,<ref name=":0" /> which is essential because it can establish disease severity and monitor the effectiveness of treatment.<ref name=":0" />

Management

Management largely consists of avoiding exposures that could trigger a reaction and taking medicine to manage the reaction. The best treatment for this allergy is avoiding exposure to cold temperatures.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Avoiding triggers

Anything that lowers the skin temperature (not body's core temperature) can trigger a reaction in affected people. Avoiding exposures limits the risk of a reaction. The reaction usually affects the body parts that are exposed, so cold air could trigger a reaction to exposed skin or in the breathing passages if cold air is inhaled. Risky exposures include:

• Situations:
  • Cold weather, including snow: Exposure to cold or cool air can quickly trigger a reaction; for example walking by the open freezer cases in a supermarket.
  • Air conditioning: Entering a cool building during a summer day can result in a reaction.
  • Cool/cold surfaces: Sitting on sidewalks which are cool, leaning on or grabbing a cold pole can result in hives forming on the area which had contact with the cool surfaces.
  • Cold IV lines: Sometimes IV lines are cold, which can result in a reaction. A line of hives may appear within Template:Convert from the IV site in the pattern of a line going up the limb.
• Activities:
  • File:Ice water.jpg

    Drinking cold beverages can trigger hives in people with cold urticaria.
    Cold foods and drinks: Eating or drinking cold or cool substances such as ice cream or iced tea may result in a reaction inside the mouth and throat.
  • Swimming: Swimming can be especially dangerous, as the rapid heart rate combined with the onset of hives can lead to hypotension, shock, and drowning.
  • Sweat: A reaction may even occur on a warm day or coming out of a sauna when there is sweat on the skin, since the reaction is triggered by skin temperature, not core temperature. If there is a breeze, it will rapidly cool the skin and create hives.
  • Restriction of blood flow: Activities which cause tense muscles and reduce blood flow can cool the body parts enough to trigger itching and hives.

Drugs

The first-line therapy is symptomatic relief with second-generation H₁-antihistamines.<ref>Template:Cite journal</ref> If standard dosing is ineffective, increasing dosages up to fourfold is recommended to control symptoms.<ref>Template:Cite journal</ref>

The second-generation H₁-antihistamine rupatadine was found to significantly reduce the development of chronic cold urticaria symptom without an increase in adverse effects at doses of Template:Val and Template:Val.<ref name=":0" />

Allergy medications containing antihistamines such as diphenhydramine (Benadryl), cetirizine (Zyrtec), loratadine (Claritin), cyproheptadine (Periactin), and fexofenadine (Allegra) may be taken orally to prevent and relieve some of the hives.<ref name="pmid11409259">Template:Cite journal</ref> For those who have severe anaphylactic reactions, a prescribed medicine such as doxepin, taken daily, should help to prevent and/or lessen the likelihood of a reaction and thus, anaphylaxis. The effectiveness of topical antihistamine creams against hives induced by cold temperature has not been evaluated.Template:Citation needed

Cold hives can result in a potentially serious or even fatal systemic reaction (anaphylactic shock). People with cold hives may have to carry an injectable form of epinephrine (like Epi-pen or Twinject) for use in the event of a serious reaction.<ref>Template:Cite journal</ref>

Studies have found that omalizumab (Xolair) may be an effective and safe treatment for cold urticaria in patients who do not sufficiently respond to standard treatments.<ref>Template:Cite journal</ref>

Ebastine has been proposed as an approach to prevent acquired cold urticaria.<ref name="pmid17900265">Template:Cite journal</ref>

See also

• Amyloidosis
• Cholinergic urticaria, a similar hives reaction in response to heat
• Aquagenic urticaria
• Diascopy
• Erythema
• Goose bumps, an unrelated, normal response to cold temperatures
• List of cutaneous conditions
• Skin lesion
• PLAID syndrome