Hypersensitivity là gì

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StatPearls . Treasure Island (FL): StatPearls Publishing; 2022 Jan-.


Type I Hypersensitivity Reaction

Malak Abbas; Mohamed Moussa; Hassan Akel.

Author Information & Affiliations

Continuing Education Activity

Type I hypersensitivity is also known as an immediate reaction và involves immunoglobulin E (IgE) mediated release of antibodies against the soluble antigen. This activity review the evaluation and management of type I hypersensitivity and đánh giá the role of the interprofessional teams in managing patients with this condition.



The immune system plays a crucial role in maintaining health and protecting the human body against microbial invasions. However, this same system can lead khổng lồ exaggerated immune và inflammatory responses that result in adverse outcomes known as hypersensitivity reactions. There are four traditional classifications for hypersensitivity reactions, and these include Type I, Type II, Type III, and Type IV reactions:<1>

Type I hypersensitivity is also known as an immediate reaction & involves immunoglobulin E (IgE) mediated release of antibodies against the soluble antigen. This results in mast cell degranulation & release of histamine & other inflammatory mediators.
Type II hypersensitivity is also known as cytotoxic reactions and engages IgG và IgM antibodies, leading to the complement system activation và cell damage or lysis.
Type III hypersensitivity is also known as immune complex reactions & involves IgG, IgM, & sometimes IgA antibodies. The build-up of these immune complexes results in complement system activation, which leads to polymorphonuclear leukocytes (PMNs) chemotaxis & eventually causing tissue damage.
Type IV hypersensitivity is also known as delayed-type and involves of T-cell-mediated reactions. T-cells or macrophages are activated as a result of cytokine release, leading to lớn tissue damage.

There has been a more recent classification introduced by Sell et al. That accounts for multiple components of the immune system and categorizes the reactions into seven parts. However, the focus of this article will be on the classic Type I hypersensitivity reactions.

Type I hypersensitivities include atopic diseases, which are an exaggerated IgE mediated immune responses (i.e., allergic: asthma, rhinitis, conjunctivitis, & dermatitis), and allergic diseases, which are immune responses khổng lồ foreign allergens (i.e., anaphylaxis, urticaria, angioedema, food, and drug allergies). The allergens that result in a type I hypersensitivity may be harmless (i.e., pollen, mites, or foods, drugs, etc.) or more hazardous such as insect venoms.<2> The reaction may be manifested in different areas of the body and may result in instances such as:

Nasal allergic rhinitis or tốt fever 
Ocular allergic conjunctivitis, potentially due to seasonal allergens such as pollen or mold spores 
Dermatological hives, atopic eczema, or erythema
Soft tissue angioedema
Pulmonary reactions, such as allergic asthma or hypoxia
Systemic reaction, which is a life-threatening medical emergency, và also known as anaphylaxis.

There are certain risk factors that increase the risk of allergic diseases. These factors include geographical distribution, environmental risks such as pollution or socioeconomic status, genetic predisposition, or the “hygiene hypothesis”. The “hygiene hypothesis” suggests that our modern society practices of good hygiene & the lack of early exposure khổng lồ many microbes or antigens may result in failures of the immune system functionality. As such, the hypothesis suggests that early exposure lớn a diverse range of microorganisms và antigens may actually lead lớn overall decreased rates of allergies, asthma, and other immune disorders.<3><4><5>


Type I hypersensitivity occurs as a result of exposure lớn an antigen. The response to the antigen occurs in two stages: the sensitization and the effect stage. In the sensitization stage, the host experiences an asymptomatic tương tác with the antigen. Subsequently, in the "effect" period, the pre-sensitized host is re-introduced to lớn the antigen, which then leads khổng lồ a type I anaphylactic or atopic immune response. There are various types of antigens that the host can be exposed to, & examples include food allergies (i.e., nuts, eggs, soy, wheat, shellfish, etc.), animal source (i.e., bee, wasp, cats, insects, rats, etc.), environmental factors (i.e., dust mites, latex, pollen, mold, etc.), atopic diseases (i.e., allergic asthma, allergic rhinitis, conjunctivitis, dermatitis, etc.), transfusion reactions, medication-induced reactions (i.e., antibiotics), & systemic reaction to lớn an allergen (i.e., hives) or anaphylaxis.<2><6>


The incidence of type I hypersensitivity is hard khổng lồ predict as discrepancies occur in the assessment of the type of reaction. For instance, some document patients as having anaphylaxis reaction status-post milder symptoms, and others report anaphylaxis with a full-blown presentation. A study predicted that the frequency of an individual experiencing anaphylaxis is 1% khổng lồ 2% worldwide, with the incidence increasing in the younger population.<7>

European research estimates that 0.3% (95% CI 0.1–0.5) of the population will undergo episodes of anaphylaxis in their lifetime.<8> While it is predicted that about 1.21% lớn 15.04% of the United States (US) population will experience anaphylaxis. In general, the prevalence of atopic disorders, such as food allergies, allergic rhinitis, conjunctivitis, dermatitis, asthma) has been on the rise and occurs in about 20-30% of the population.<9><10>


Allergens (or antigens) are presented khổng lồ T-cells by Antigen-presenting cells (APCs) during the sensitization phase of Type I hypersensitivity. T-cells then signal for stimulation of B-cells khổng lồ produce IgE antibodies, which bind to lớn the Fc receptors on mast cells và basophils. Subsequently, the free antigen induces the crosslinking of these mast cell & basophil bound IgE antibodies. This results in the degranulation of the cells và the release of histamine, proteolytic enzymes, and other mediators (i.e., prostaglandin, cytokines, leukotrienes, platelet-activating factors, macrophage inflammatory proteins, tryptase, etc.).

As a result, there is increased vascular permeability, peripheral vasodilation, and smooth muscle contraction, which can manifest lớn increased mucous secretions, bronchospasm, abdominal cramping, rhinitis, & potentially hypovolemia or hypoxia. Pulmonary edema or general edema can also occur due to fluid shifting into interstitial space. Individuals can experience pruritis và local response of asthma or a systemic response of anaphylaxis.<11>


The histological appearance of type I hypersensitivity can be differentiated from other hypersensitivity reactions based on the type of cell responses. In giỏi fever and allergic asthma, neutrophils, eosinophils, and potentially basophils are found in the mucosal and submucosal tissues of the respiratory tract and bronchial wall, respectively.<12>

History và Physical

The initial step for appropriately diagnosing Type I hypersensitivity is khổng lồ obtain a full history from either the patient or the patient"s companions. Information about the patient"s history should include:

Signs and symptoms 
Timing: onset of signs and symptoms 
If the patient ingested anything or any new changes or triggers that caused the reaction 

Medical history alone is not sufficient lớn diagnose an allergic response. A complete physical examination should also be performed. The presentation depends on the organs that are involved. In general, a patient that presents with a type I hypersensitivity usually develops a reaction within one hour after exposure to an antigen. The signs và symptoms exhibited in this type of reaction involve vasoactive mediators that are released by IgE bound mast cells và basophils.

The most common chief complaint và physical symptoms may include rash, hives, erythema, pruritis, edema, flushing, bronchospasm, wheezing, rhinitis, & gastrointestinal symptoms such as abdominal cramping. The presence of "wheal-and-flare" (skin bump & redness) reactions are the hallmark of IgE mediated reactions. Patients that present with anaphylaxis may also experience episodes of loss of consciousness, nausea, vomiting, angioedema, hypotension, tachycardia, tachypnea, etc. When assessing for anaphylaxis, the first steps are to evaluate the airway, breathing, circulation, và mentation.<13>


There are both in-vivo & in-vitro objective testing that can help with the diagnosis of Type I hypersensitivity.<14><15><16>

In-Vitro Testing

Upon presentation, the following in-vitro laboratory markers can be ordered và used lớn help diagnose anaphylaxis:

Serum tryptase, which is released by mast cells in an hour post-activation, elevated levels can indicate an increased risk of anaphylaxis.
Eosinophil count can be increased in atopic disorders.
Total IgE may also be elevated in atopic disorders; however, it should not be used as a definitive kiểm tra for diagnosis, as normal levels may also be seen with other types of hypersensitivities.
Allergen-specific IgE assays are preferable lớn in-vivo skin testing, as they can help identify food allergens or other antigens that are causing a reaction.
Histamine levels may be collected; however, the assays are not reliable, & the levels are short-lived.

In-Vivo Testing

In-vivo measurement can be useful to lớn identify food allergies, venom allergy, allergic rhinitis, allergic asthma, penicillin, and other drug allergies. It involves performing a skin demo in an outpatient setting that introduces small amounts of the allergen into the skin to lớn observe for an allergic response. A positive skin reaction is represented by a wheal-and-flare response within 15-20 minutes of allergen exposure. The more invasive the testing is, the lower the incidence of false-negative, but the greater the risk of anaphylaxis. Of note, there are various methods of skin testing. These include skin prick test, scratch test, & the intradermal test.

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Other in-vivo tests that may be performed in an outpatient setting are:

Spirometry or pulmonary function tests can be used khổng lồ assess asthma.
Inhalation challenges with specific allergen và histamine, mannitol, and methacholine are used to assess airway hypersensitivity.
Eosinophil count from nasal smear or induced sputum can be collected as well lớn confirm hypersensitivity.

Treatment / Management

The type of treatment provided lớn the patient for type I hypersensitivity depends on the presentation and the etiology of the reaction.<15><16>


The need for emergent treatment is vital with anaphylaxis, at it is usually rapid in onset và may cause death. The recommendation is that if possible, the offending agent is removed immediately, & patients are placed in a supine position with the elevation of lower extremities unless there is a significant obstruction or airway inflammation. If there is marked stridor or severe respiratory distress, immediate intubation may be required. If the patient has a history of allergic reactions, they will be provided with emergency self-treatment prescriptions, which include: an epinephrine im autoinjector or 1:1,000 solution, bronchodilators, antihistamines, and/or corticosteroids. The first-line therapy that is recommended lớn be administered without delay is epinephrine intramuscular (IM) injection & thereafter adjunctive therapy is utilized for symptom control:<13>

Epinephrine has alpha-1, beta-1, and beta-2 adrenergic agonist effects. As such, it can increase vasoconstriction and peripheral vascular resistance và decrease airway or mucosal edema. The beta effects lead to increased inotropy, chronotropy, vasodilation, và decreased release of inflammatory mediators from both mast cells và basophils.
The dose for the epinephrine is weight-based và may be repeated every 5 to 15 minutes. Studies have demonstrated that in about 35% of cases, a repeat dose is required. 
Infants weighing <10 kilogam should be given an exact weight-based dose (not estimated), whenever possible. However, if drawing up an exact dose is likely to cause a significant delay in a patient with severe symptoms or who is rapidly deteriorating, the 0.1 mg dose can be given by autoinjector or by drawing up 0.1 mL of the 1 mg/mL solution. If the 0.1 mg autoinjector is not available, the 0.15 mg autoinjector can be used.
For weight 10 to 25 kg: the dose is 0.15 mg of epinephrine yên injected to anterior-lateral thigh
For weight >25 kg: the dose is 0.3 mg of epinephrine lặng injected to lớn anterior-lateral thigh
For the epinephrine solution of (1 per 1,000), the dose is 0.01 mg/kg per dose (maximum of 0.5 mg/dose)
Epinephrine may also be administered via slow continuous infusion, endotracheal, or intra-osseous route. The recommendation is lớn monitor blood pressure & heart rate with its administration. 
Beta-agonists, such as albuterol, are given as either metered-dose inhaler (MDI), dry-powder inhaler (DPI), or nebulized solution and are usually administered when the patient is not responsive to lớn epinephrine for treating bronchospasm.
Albuterol MDI or DPI dose (90 mcg/actuation): adults are to administer 2 to 3 inhalations as needed for symptoms relief; in severe exacerbations, doses up to lớn 8 inhalations every đôi mươi minutes may be needed. Whereas the pediatric dose is 4 to 8 puffs every trăng tròn minutes for up to lớn 3 doses, data is limited in ages <4 years old.
Antihistamines: i.e., diphenhydramine (H1 antagonist), famotidine or ranitidine (H2 antagonists) 
Antihistamines are considered second-line adjunctive therapy và can provide relief of symptoms such as hives or pruritis. However, antihistamines should not be used as monotherapy, as they vì not mitigate upper or lower airway obstruction, shock, or hypotension. Although antihistamines are usually used in combination with both an H1 antagonist and an H2 antagonist in anaphylaxis, there is a lack of direct evidence to support their administration. Second-generation H1 antagonists have fewer sedative effects than first-generation agents, và as such, they may also be considered. Some studies suggest that when H2 antagonists are given intravenously (IV), they can increase hypotension.
Diphenhydramine IV dose: 25 to 50 mg per dose in adult patients và 1 to 2 mg/kg/dose in pediatrics (maximum 50 mg/dose); dose may be repeated every 6 hours.
Ranitidine oral (PO) or IV: 1 to 2 mg/kg per dose (maximum 75 to 150 mg of oral and IV in adults và a maximum of 50 mg/dose in pediatrics).
Famotidine IV: đôi mươi mg diluted khổng lồ 5 ml 0.9% normal saline and pushed over two minutes in adults and 0.25 mg/kg (maximum trăng tròn mg per dose) in pediatrics. 
Glucocorticoids do not have an acute role in the treatment of anaphylaxis due khổng lồ their delay in onset of action, & the literature lacks any randomized-controlled trials that have shown benefits for their use. However, the theoretical rationale for their use is to lớn decrease biphasic or protracted reactions that may occur in anaphylaxis.
Methylprednisolone: 1 to 2 mg/kg/day (maximum 125 mg/dose) for one to two days without the need for taper.

Other adjunctive therapies for anaphylaxis include supplemental oxygenation, IV fluids for volume resuscitation, glucagon or vasopressors for refractory hypotension, and/or atropine for bradycardia. During and post anaphylaxis, the following should be ideally monitored: blood pressure, respiratory status, oxygenation, urine output, cardiac function, và heart rate at continuous intervals or frequently.<13>


Treatment of urticaria is similar to anaphylaxis where the offending agent is removed if known, and then the patient is given an H1 antihistamine and glucocorticoids (see above for dosing). There is not a need for epinephrine unless there is suspicion for anaphylaxis.<18> Patients with chronic urticaria who are refractory to H1 antihistamines may benefit from omalizumab, which is a monoclonal antibody that inhibits the binding of IgE to receptors on mast cells & basophils, or cyclosporine, which is an immunomodulator.<19>

Allergic Asthma/Allergic Rhinitis/ Allergic Conjunctivitis/Allergic Dermatitis/Eczema/Wasp or bee venom/Drug Allergy/Food Allergy 

For allergic conditions, avoidance of the offending agent is the first step in treatment. Oral or topical H1 antihistamine and oral or inhaled glucocorticoids may be used for symptomatic control. For allergic rhinitis, topical nasal or optical decongestants can provide temporary relief of symptoms. For allergic asthma, patients can be prescribed inhaled beta-agonists with or without inhaled corticosteroids based on steps of asthma therapy guidelines by the National Heart, Lung, and Blood Institute. 

Patients with significant symptoms despite avoidance of the allergen và who have a lack of relief from adjunctive therapy can undergo allergen immunotherapy, such as desensitization or hypo-sensitization (allergy shots). The patient must have a documented IgE-mediated allergy (allergic: asthma, rhinitis, conjunctivitis, dermatitis, drug allergy) prior to lớn initiation of immunotherapy. The treatment is carried out in a clinical setting for the first doses, where certain allergens are administered in a slow escalation of subclinical doses. The route of administration is either via subcutaneous immunotherapy (SCIT), sublingual/sallow immunotherapy (SLIT), or mucosal route.

The goal of desensitization is lớn stimulate the production of immunoglobulin G (IgG) antibodies on mast cells instead of IgE. This technique is known as isotype switching & usually lasts for three years. Desensitization treatment is successful in about 67% of patients and is usually more beneficial in younger patients và those who have a sensitivity to a monovalent allergen. Patients need khổng lồ be prescribed và educated about the proper use of epinephrine autoinjectors prior to lớn the initiation of immunotherapy.<18><20>

Differential Diagnosis

Common diseases that can have a similar presentation khổng lồ type I hypersensitivities include pulmonary diseases such as acute asthma (non-allergic) or chronic obstructive pulmonary disease (COPD) or emphysema, pneumothorax, aspiration, epiglottitis, hereditary angioedema, irritable bowel syndrome, upper respiratory infections, syncope, panic or anxiety attacks, or generalized urticaria due to infectious process or hot/cold stimuli.

Additionally, certain types of shock such has hypovolemic (i.e., ruptured ectopic pregnancy, systemic capillary leak syndrome), cardiogenic, distributive (i.e., sepsis), or obstructive (i.e., pulmonary embolism, cardiac tamponade) shock mimic anaphylaxis.

Certain medications và disease states can also cause flushing reactions that are not attributed lớn anaphylaxis, such as the fast infusion of vancomycin resulting in red man syndrome, alcohol, carcinoid syndrome, or perimenopause. In addition, there are other nonorganic diseases that need khổng lồ be differentiated, such as psychosomatic episodes, or Munchausen stridor, or anaphylaxis in which the patient self-induces the reaction by purposely ingesting the offending agent.<21>


There are two stages in the course of Type I hypersensitivity: immediate reaction and late-phase reaction. During the initial phase, there is a sudden response within minutes of exposure khổng lồ the allergen. While the late-phase may develop 4 to 12 hours post early phase reaction and can last for up lớn 24 to 73 hours. Late-phase reaction, as mediated by eosinophils, neutrophils, & lymphocytes, can result in increased release of more mediators, which can lead khổng lồ further tissue damage, swelling, increased erythema, cough, wheezing and secretions.<13>


The prognosis of type I hypersensitivity depends on the extent of the reaction. In general, the reaction is short-lived, và as long as symptoms are controlled or antigen is avoided, there is a low risk of harm. However, death can occur within minutes of the onset of signs or symptoms of angioedema, anaphylaxis, or rarely severe asthma, if not identified và treated immediately. Risk of death increases with age, with about a 7-times fold in adults compared to lớn children, & approximately 75% greater in blacks versus whites, & 30% increased risk in females.<22>


As previously stated, the most life-threatening complication of Type I hypersensitivity is anaphylaxis, which can increase the risk of mortality. During an anaphylactic reaction, the patient may experience hypotension, difficulty in breathing or hypoxia, and/or circulatory failure (distributive shock).

Confirmation of anaphylaxis causes và an emergency care plan, which is available online khổng lồ be printed in different languages (such as Food Allergy Research & Education )

Pearls và Other Issues

It is important to note that a late phase reaction can develop 4-6 hours post first signs và symptoms of anaphylaxis or type I hypersensitivity. As such, patients with moderate lớn severe anaphylaxis who bởi not respond initially to lớn epinephrine should be admitted for observation, while patients who bởi vì respond to epinephrine should be observed for a minimum of four hours. Furthermore, treatment errors can occur with improper administration of appropriate doses of medications. For instance, epinephrine should be given as soon as anaphylaxis is suspected post-exposure to lớn the allergen. It is important lớn recognize that antihistamines và other therapies are used as adjunctive treatment and never as monotherapy. 

The risk for annual recurrence for anaphylaxis was found to be about 18% in over 300 patients identified in a prospective study.<23> Therefore, appropriate education to patients who present with anaphylaxis is important. When counseling patients, the mnemonic “SAFE” can be used khổng lồ remind patients about the steps that need khổng lồ be completed once they are discharged from an institution post anaphylaxis. SAFE represents: Seek support, Allergen identification, và avoidance, Follow-up for specialty care, Epinephrine for emergencies. 

Prevention is the most important treatment for allergic responses, which includes liên hệ avoidance and elimination of the offending agents. There is conflicting data that suggests breastfeeding can be beneficial in preventing asthma và atopic dermatitis. In addition, the expert panel (EP) as part of the guidelines for the diagnosis & management of food allergies in the United States suggests that breastfeeding may also help prevent food allergies. This same EP also suggests that solid foods should be introduced into the child’s diet before 4 to 6 months of age to help with the prevention of allergies.

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Enhancing Healthcare Team Outcomes

Consultation khổng lồ specialists, such as an allergist or pulmonologist, is appropriate with type I hypersensitivities, especially if adjunctive therapies are not able khổng lồ control symptoms. Pulmonologists will be beneficial khổng lồ asthmatic patients as they would be able lớn appropriately monitor the patient and escalate based on the step therapies, including monitoring of pulmonary function tests. Cooperating with pharmacists lớn provide more thorough counseling of appropriate use of medications & education on epinephrine auto-injectors is beneficial to patients. Pharmacists can also develop protocols for medication desensitization. Nurses can help educate patients on diet, anaphylaxis, and signs & symptoms lớn monitor. Nurses can also continue to assess the patient in an acute setting post initial allergic response.

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