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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

1.0K
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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Allergic Drug Reactions01:27

Allergic Drug Reactions

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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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Allergic Reactions02:06

Allergic Reactions

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Overview
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Venous Thrombosis III: Interprofessional Care01:29

Venous Thrombosis III: Interprofessional Care

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Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
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Drug Delivery: Parenteral Route01:29

Drug Delivery: Parenteral Route

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The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...
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Updated: Sep 5, 2025

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

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Delayed-Type Heparin Allergy: Intravenous Tolerance Despite Inflammatory Skin Reaction After Subcutaneous Injection.

Axel Trautmann1, Franziska Grän1, Johanna Stoevesandt1

  • 1Department of Dermatology and Allergy, University Hospital Würzburg, Würzburg, Germany.

The Journal of Allergy and Clinical Immunology. in Practice
|July 5, 2022
PubMed
Summary
This summary is machine-generated.

Heparin allergy often causes skin reactions. Intravenous unfractionated heparin (UFH) is safe for emergency use in patients with suspected heparin allergy, even without prior testing, if no skin necrosis or thrombocytopenia is present.

Keywords:
AnaphylaxisDrug adverse reactionDrug allergyDrug hypersensitivityEczemaExanthemaFondaparinuxLow-molecular-weight heparinUnfractionated heparin

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Area of Science:

  • Allergy and Immunology
  • Pharmacology
  • Dermatology

Background:

  • Heparin allergy commonly presents as delayed-type hypersensitivity (DTH), causing itchy skin reactions at injection sites.
  • A critical differential diagnosis for heparin-induced skin reactions is heparin-induced thrombocytopenia (HIT) leading to skin necrosis.
  • Distinguishing between DTH and HIT is crucial for appropriate anticoagulation management, especially in emergencies.

Purpose of the Study:

  • To investigate the clinical presentation and diagnostic patterns of heparin allergy.
  • To assess the safety of alternative anticoagulants and unfractionated heparin (UFH) administration routes in patients with confirmed heparin allergy.
  • To guide clinical decisions regarding anticoagulation in patients experiencing adverse reactions to heparin.

Main Methods:

  • Conducted standardized allergy diagnostics on patients with suspected heparin allergy over 17 years.
  • Included challenge testing with subcutaneous fondaparinux and intravenous UFH administration.
  • Utilized intradermal testing to evaluate cross-reactivity between different heparin products.

Main Results:

  • Of 50 patients with heparin allergy, 96% had DTH, while only 4% had immediate-type hypersensitivity.
  • Intradermal testing showed broad cross-reactivity between UFH and various low-molecular-weight heparins (LMWH).
  • Intravenous UFH was tolerated by all patients challenged, even those with confirmed DTH to UFH and LMWH.

Conclusions:

  • In cases of inflammatory skin reactions without necrosis or thrombocytopenia, intravenous UFH is likely safe for emergency use without prior allergy testing.
  • Fondaparinux is identified as the preferred alternative for subcutaneous heparin administration.
  • These findings support the safe and judicious use of UFH in emergency situations for patients with suspected heparin hypersensitivity.