Introduction
Background
Patients with urticaria for more than 6 weeks are given the diagnosis of chronic urticaria (CU). This distinction is important because an inciting event or etiology is not identified for the majority of patients with chronic urticaria, giving rise to the often-used term, chronic idiopathic urticaria (CIU). A proportion of patients with chronic urticaria have physical urticaria,1 which is urticaria incited by a physical stimulus such as cold, vibration, or pressure. Also see Urticaria, Cholinergic; Urticaria, Contact Syndrome; Urticaria, Dermographism; and Urticaria, Solar.
Pressure urticaria is an uncommon form of physical urticaria. Pressure urticaria may occur immediately (within minutes) after a pressure stimulus2 ; however, more commonly, pressure urticaria develops after a delay of 4-6 hours after a pressure stimulus; hence, the designation delayed pressure urticaria (DPU) is used. The wheals may last for 8-72 hours. The hands, feet, trunk, buttocks, legs, and face are the most common areas affected. Lesions can be induced by a variety of stimuli, including standing, walking, wearing of tight clothes, or sitting on a hard surface.3
Pathophysiology
The pathogenesis of delayed pressure urticaria is unknown. No allergen can usually be identified. Mast cells and histamine release are believed to play roles because the injection of compound 48/80, which causes depletion of mast cell mediators, prevents the induction of lesions in the injected area.4 Histamine levels are increased in lesional skin, and intracellular histamine levels are decreased in peripheral white blood cells.5 Despite these findings and the finding of increased stimulated histamine release, histamine is not likely to be the sole mediator in pressure urticaria, given the relative unresponsiveness of the condition to antihistamine treatment.
Other possible mediators include eosinophils, given the elevated numbers of eosinophils, eosinophil cationic protein (ECP), and eosinophil cationic factor (ECF) found in biopsy specimens from some patients with delayed pressure urticaria, particularly bullous delayed pressure urticaria.6 Elevated concentrations of interleukins 5 and 6 and leukotrienes have also been found in lesional skin of pressure urticaria patients.7,8
Frequency
United States
Delayed pressure urticaria is considered a rare entity. Some investigators suggest that delayed pressure urticaria is more prevalent but is not consistently recognized. One study of 2310 patients with urticaria, seen over 32 years, found the prevalence of delayed pressure urticaria to be 2%.9
Mortality/Morbidity
Depending on the severity of the disease and the associated symptoms, delayed pressure urticaria can be disabling, especially in patients who perform manual labor. Delayed pressure urticaria is a chronic disease, with a mean duration of 9 years (range, 1-40 y).10 The morbidity of delayed pressure urticaria varies, depending on the severity and the response to treatment.
Quality-of-life (QOL) tools have demonstrated an impairment in QOL scores similar to patients with cardiac disease or chronic dermatoses such as psoriasis and atopic eczema. QOL scores were lowest for energy, social isolation, emotional reaction, and sleep disturbance. The dimension of daily living activities was more profoundly impaired in patients with chronic idiopathic urticaria than in those with atopic eczema or psoriasis.11
Sex
Delayed pressure urticaria is slightly more common in men than in women.
Age
The peak age of onset of delayed pressure urticaria is in the 20s and 30s (range, 5-63 y).10
Clinical
History
- Signs and symptoms of delayed pressure urticaria are atypical in comparison to most types of urticaria.
- Onset is typically delayed, most commonly occurring 4-hours after the pressure stimulus. Less commonly, wheals due to pressure develop within minutes and can be confused with dermatographism.
- Lesions can persist for several hours to up to 48 hours, unlike those in typical urticaria, which resolve within 24 hours.
- The lesions may be pruritic, painful, or burning.
- Lesions can occur on any cutaneous surface. Lesions may mimic angioedema.
- With severe episodes, patients may experience fever, malaise, fatigue, chills, headache, and generalized arthralgias.
- Affected areas can be refractory to the development of new lesions for 1-2 days.
- As many as 60% of individuals with delayed pressure urticaria are affected by a concomitant component of chronic idiopathic urticaria, immediate and/or delayed dermatographism, and/or angioedema.
Physical
- The physical findings in delayed pressure urticaria include wheals, typically involving the palms, soles, legs, and waist. Delayed pressure urticaria lesions may also involve the genitals.
- The wheals, which appear as deep dermal and subcutaneous swellings, often resemble angioedema more than urticaria.
- Typical urticaria may also be present as a result of coexisting chronic idiopathic urticaria or some other chronic physical urticaria.
Causes
- Pressure stimuli may include the following:
- Standing, walking, or sitting on a hard surface
- Using tools, such as a screwdriver or a hammer
- Hand clapping
- Carrying a handbag
- Wearing tight-fitting clothes, such as bra straps, belts, shoes, cuffs, or watches
- Dental work
- Kissing
- Sexual intercourse
- Tampon use
- Occasionally, delayed pressure urticaria is aggravated by heat, aspirin, or menstruation.
More on Urticaria, Pressure |
Overview: Urticaria, Pressure |
| Differential Diagnoses & Workup: Urticaria, Pressure |
| Treatment & Medication: Urticaria, Pressure |
| Follow-up: Urticaria, Pressure |
| References |
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References
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Further Reading
Keywords
urticaria, pressure urticaria, delayed pressure urticaria, DPU, PU, chronic idiopathic urticaria, physical urticaria, vibratory urticaria, dermatographism
Overview: Urticaria, Pressure