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Allergic Reactions02:06

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Allergic Drug Reactions01:27

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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Hypersensitivities01:30

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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Cholinergic Antagonists: Pharmacokinetics01:24

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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Cholinergic Receptors: Muscarinic01:25

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Antimuscarinic drugs block muscarinic receptors in multiple systems, including the gut, eye, smooth muscles, respiratory tract, cardiovascular, and central nervous systems. They produce similar effects with varying selectivity depending on the specific agent and tissue. Here are the key pharmacological actions of antimuscarinics:
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Skin reaction patterns in cholinergic urticaria.

Ilona Shurmelova1, Agata Baldyga2, Eva Grekowitz3

  • 1Department of Dermatology and Venerology, Kepler University Hospital, Linz, Austria.

Allergology International : Official Journal of the Japanese Society of Allergology
|September 5, 2024
PubMed
Summary
This summary is machine-generated.

Six distinct skin reaction patterns were identified in cholinergic urticaria (CholU) patients, with varying prevalence and associations with disease severity and sweating impairment. Further research is needed to link these patterns to treatment response.

Keywords:
Cholinergic urticariaClinical pictureSkin reactionsSweatingWheal

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Area of Science:

  • Dermatology
  • Immunology
  • Allergy

Background:

  • Cholinergic urticaria (CholU) presents with diverse skin reactions.
  • The definition, prevalence, and clinical significance of these patterns are not well understood.

Purpose of the Study:

  • To define and characterize distinct skin reaction patterns in CholU.
  • To investigate the prevalence and clinical correlations of these patterns.

Main Methods:

  • Patients with CholU underwent ergometry provocation testing.
  • Skin reaction patterns were analyzed based on wheal characteristics and surrounding skin responses.

Main Results:

  • Six distinct CholU skin reaction types were identified, with prevalences ranging from 11% to 83%.
  • Most patients (94%) exhibited multiple reaction types.
  • Reduced sweating was common, most pronounced in Type VI reactions (extremities).
  • Type V reactions correlated with severe clinical presentation and poor quality of life.

Conclusions:

  • CholU skin reactions are diverse and often co-occur.
  • Specific skin signs are associated with distinct clinical features and disease severity.
  • Future studies should explore treatment response correlations with identified skin patterns.