allergy and immune disorders
DESCRIPTION
Allergy and Immune Disorders. Med/Surg. Allergy-hypersensitivity to one or more substances. Acquired through exposures to substances Allergist-physician that specializes and treats allergies - PowerPoint PPT PresentationTRANSCRIPT
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Med/Surg
Allergy and Immune Disorders
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Allergy-hypersensitivity to one or more substances
Acquired through exposures to substancesAllergist-physician that specializes and treats allergiesImmunity is based on the ability of the body to
recognize foreign proteins and to destroy foreign matterAntigen is a foreign protein substance and the normal
reaction from the body is to produce antibodiesAntibodies release histamine (chemical mediators)
antigen-antibody responseThese mediators start a series of reactions in the bodyAllergic reactions do not form during the first exposure
to antigens, only during subsequent contactsAutoimmune disorders-body fails to recognize its own
cells and destroys themAllergies are responsible for symptoms that range from
rhinorrhea, skin rash to asthma or anaphylaxis
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Allergy-hypersensitivity to one or more substances
Dx tests: detailed medical history and physical exam, laboratory and skin tests, allergy-antibody response varies with seasons, fatigue, and hormones
Lab tests: CBCD, eosonophil count, eosinophil smear of secretions, blood levels of IgE (immunoglobulin E)
*Skin tests: done to confirm disorders or determine the cause of allergic reactions intradermally. The needle is held flat against the skin and the bevel up.
*Physical examination information:DyspneaSyncopeNasal edema and congestion
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Skin TestsAntigens are injected intradermally or
applied to a scratch on the skinAfter 20-30 minutes, the skin test is read,
redness (erythema), or an induration (lump, wheal, or edema) represent a positive test
Degree of edema (measured in mm’s) indicates the severity of the reaction
Physician may premedicate with antihistamines prior to these tests
Monitor the client closely because they could have a severe allergic reaction (anaphylactic reaction)
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Nursing ProcessData collectionObserve and assess (head to toe)Question client about pruritus, numbness, dyspnea,
tinglingExamine for rash, urticaria, rhinorrhea, sneezing,
wheezing Document and REPORT abnormal s/sA person can have an allergic reaction to any medication
*the reaction is more dramatic if the medication is administered parenterally
Check allergies prior to administering meds*Immune disorders often present with fatigue, dyspnea,
recurrent infections, joint pain, rashes, slow wound healing or visual disturbances
Ask about family Hx
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Nursing Diagnosis for Allergy
DiarrheaRisk for InjuryImpaired Skin IntegrityDisturbed Sleep PatternFatigueDelayed Growth and DevelopmentDisturbed Self-esteem
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Planning and ImplementationClient may require assistance with
Activities of daily living Dealing with emotional aspects of living with
chronic disorderTeach client, family about
Disorder and its prognosis, treatment
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Nursing Process: EvaluationEvaluate outcomes of care
With client, family, other members of healthcare team
Short and long term goalsSymptom controlMedication compliance
Seriousness of disorder influences future planning for care, rehabilitation
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AllergiesImmunogen-antigens that cause an immune response in the body
Allergens-antigens that cause a tissue reaction to occur
Sensitive or allergic reaction occurs when a person has a tissue reaction to a specific substance
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AllergiesAllergens can enter the body via:
inhalation-pollen, dust, moldingestion-meds, foods, eggs, nutsinjection-meds, insect bites/stings, immunizations with animal serum, blood transfusions
direct contact-poison ivy, dyes, latex rubber, wool
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AllergiesManifestation of allergies r/t many factors
inheritedhormonal responsetype and concentration of allergenbody part involvedexposure to the allergenillnessallergy response can occur at any ageallergic reaction may include skin, respiratory, GI tract
edema-often r/t allergy and may occur on any body part: Monitor AIRWAY!!
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Allergies with skin responseUrticaria-erythematous areas, burning
around swollen patches of skinItching (pruritis)Burning
These all appear suddenlyDisappear in a few hours or last days, weeks
Result from food, additives, meds, infections, stress
Tx: identify cause and give meds: antihistamines, epinephrine or steroids
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AllergiesEczema
tiny, oozing, itchy blisters usually located on the neck, elbows and knees
Chronic eczema-scaly, thick skinContact Dermatitis
most common allergen is poison ivy, oak or sumac
causes itching, swelling, redness, blistersEncourage client to refrain from scratchingUse cool compresses or showersLight patting of the areaDistraction Avoid vigorous rubbing
soap, detergent, perfumes, cosmetics, metals in jewelry, wool, latex, and leather are other allergens
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Allergies with a respiratory response
Allergic asthma-spasms of smooth muscles of the bronchiCauses edema, dyspnea, mucus accumulation and wheezingIf severe enough, death may occur
Bronchial asthma-commonMay be induced by exercise, meds, stress, etc.Sx: recurring paroxysms of dyspnea with wheezing,
dyspnea, tight chest, cough, wheezing, thick sputum, cyanosis, diaphoresis, tachycardia, tachypnea, death in extreme situations
Cause-narrowing of the lumen of the smaller bronchi and bronchioles
Tx: corticosteroids, bronchodilators, antihistamines, anticholinergics
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Allergic Rhinitis inflammed nasal passages caused by an
allergenS/S: edema, burning, itching, watery eyes and
rhinorrheaAllergens include pollen, molds, dust, dust
mites, perfumesSymptoms are seasonal or perennial
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Food AllergyFood allergens include: eggs, wheat, soybeans,
fish, shellfish, chocolate, seeds, nuts, beer, corn, citrus fruits, and some dairy products
S/S: n/v/d, abd. pain, tenderness; swelling of the lips and throat, rhinoconjunctivitis, sneezing, wheezing, urticaria, migraines
Tx: avoid those food allergens that cause these sx’s
Latex allergies are noted in people who have hypersensitivities to bananas, avocados, kiwis, chestnuts
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Drug AllergiesAdverse reactions: result from the antigen-
antibody response, unintended response to a drugS/S: depend on the drug, obtain a thorough H&P
Serum Sickness or Serum Reaction-antiserum used for rabies may cause a severe reaction
Body’s immune system attacks the serum or med administeredS/S: occur 7-14 days after receiving a drug, body
has not developed antibodies; itching at injection site, skin rash, enlarged lymph nodes, general weakness, elevated temp
Tx: antihistamines, corticosteroids
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Allergy with Multisystem Response
Symptoms occur in more than one body systemS/S: itching, edema, GI or respiratory symptomsEx: latex allergy which produces itching, erythema,
edema, respiratory, cardiac and GI symptoms may occur, wheezing, dyspnea, laryngeal edema, bronchial spasm, tachycardia, and cardiac arrest, anaphylaxis may occur
Tx: Avoid substanceMay be difficult to identifyIf allergic to pollens, do not rake grass or mowIf allergic to pets, avoid themExercise is encouraged rather than discouraged.
Instruct clients to use their inhalers before exercise to avoid bronchospasm
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ImmunotherapyDesensitization or hyposensitizationGive minute doses of allergens subq.Doses increased until client can tolerateMay eliminate the allergyIf receiving injections, must start them at
least 3 months prior to allergy season. Expensive and may last 1- 2 years or longer
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Medication TherapyGiven to counteract an allergy or to relieve
symptoms. Antihistamines-inhibit the action of
histamine (mediator in allergic response) Provide temporary relief and must be used freq.
Meds may cause drowsiness and should not be used long term.
Antihistamines may dry secretions and may make it difficult to swallow or expectorate
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Medication TherapyDecongestants (nasal congestion)
bronchodilators and expectorants (relieve respiratory symptoms) cortisone (relieve itching and inflammation) epinephrine (used in emergencies to neutralize adverse effects of histamine)
Antihistamine inhibit the action of histamine, a major chemical mediator involved in the allergic response. These medications may cause drowsiness, in clients who have asthma, antihistamines may dry up the secretions so much that clients cannot swallow or expectorate
Leukotrienes are chemical mediators that are 100-1000 times more potent than histamine in causing bronchospasm
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AnaphylaxisSevere and may result in laryngoedema,
shock, vascular collapse, and deaths/s: see box 84-1
Causes include: ASA, vaccines, foods, x-ray contrast medium with iodine, antibiotics, insect venom
Tx: IMMEDIATE d/t airway obstruction, remove cause, administer antihistamines, if d/t injection or insect bite, apply tourniquet and use ice to slow absorptionOPEN AIRWAY!!!!SUPPORT CIRCULATION!ADMINISTER MEDS!!!
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Immune DisordersImmunity-body’s adaptive state to protect itself
from disease, normalInfectious diseases-more virulent than immune
system antibodiesImmunosuppression-immune system is
depressed d/t disease, shock, injury, drugs,or radiation, may be congenital (agammaglobulinemia)
Overproduction of gamma globulins-alignant blood diseases or infection present
Severe immune response to an antigen that is invading (anaphylaxis)
Rejection response-foreign substance in the body is rejected; organs, skin grafts
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Autoimmune DisordersBody does not recognize itself, therefore, produces
antibodies against its own healthy cellsCalled autoimmunityCause unknown, believe that genetic predisposition,
interaction with physical, chemical, and biologic agents trigger abnormal immune responses, and abnormal immune cells that lead to abnormal immune responses
TypesOrgan-specific (localized autoimmune disease)-affects
one organExamples: DM-type 1, Hashimotos thyroiditis, Grave’s Disease, Addison’s disease, MS, Guillan BarreNon-organ specific (systemic autoimmune disease)-
affecting one or more organsExamples: Rheumatoid arthritis, SLE, scleroderma,
polymyalgia rheumatica
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Autoimmune DisordersAt Risk
Genetic predispositionFemales (SLE)Abnormalities in immune cells
ExamplesRejection of transplanted organ-deemed foreign
object by the body and the normal immune system will reject this
Tissue typing performed prior to transplantUse immunosuppressive drugs for lifeS/S: chills, fever, HTN, diaphoresis, hypotension,
edema, and organ involvement
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SLE (Systemic Lupus Erythematosus)Chronic systemic disorder (widespread
damage to connective tissue)Believed to be caused by antibodies that
fight the body’s own cells and tissues that it normally protects leading to inflammation and tissue/organ damageExacerbations caused by pregnancy and
BCP use are d/t increase in estrogenS/S-waxes and waning symptoms such as
fatigue, fever, weight loss, see pictureShift of WBC to left in a CBC-D (implies
infection d/t increased # of immature band cells)
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SLEDiagnosis is made by 4 of 11 criteria: malar rash, discoid rash, photosensitivity, oral ulcers, arthritis, serositis, renal disorder, neurologic disorder, hematologic disorder (hemolytic anemia or leukopenia), immunologic disorder (+LE cell prep) , antinuclear antibody (+ titer)
Damage to hematologic system, skin, heart, kidneys, brain, connective tissue
Note a false + syphilis test may occur in client’s with SLE d/t the phospholipid used in the assay; chronically false + veneral disease research laboratory or RPR tests may indicated a client has SLE
Tx-NOT CURABLE; managed with meds and lifestyle modification such as rest, stress management, use anti-inflammatory agents and corticosteroids, goals of tx: decrease inflammation, suppress overactive immune system, prevent symptom flares
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SLEDrugs: NSAIDS, antimalarials (control rash,
fatigue, fever), corticosteroids, cytotoxic drugs (suppress the hyperactive immune response)
Nsg care: tx to prevent flare-ups: limit sun exposure, eat healthy, get adequate rest, exercise, and learn to recognize signs of impending flare-ups
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Rheumatoid ArthritisChronic and systemic diseaseInflammed joints
Swan neck deformity and ulnar deviationMay have systemic manifestations
Morning stiffness lasting over 1 hour, fatigue, wt. loss
Autoimmune disorder of the musculoskeletal system
S/S: fatigue, stiffness in am, weakness, muscle pain, loss of appetitie, most commonly begins in the smaller joints of the fingers, hands and wrists, joint involvement is symmetrical
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Rheumatoid ArthritisProgresses in 3 stages:
Synovial lining swellingRapid division and growth of cells which causes
the synovium to thickenInflamed cells release enzymes that digest bone,
cartilage, which often causes the joint to lose its shape, alignment and movement
Tx: symptomatic use analgesics, corticosteroids (prednisone-take same time every day), radiation to suppress normal antigen-antibody responses, heat and cold tx., gold salts (MONITOR for ANAPHYLAXIS!!!)
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RABiologic Response Modifiers-etanercept, infliximab
Drugs modify immune system by inhibiting proteins called cytokines which contribute to inflammation
Protein-A Immunoadsorption Therapy-therapy that filters blood to remove antibodies and immune complexes that promote inflammation
Disease Modifying Antirheumatic Drugs (DMARDS)-methotrexate-standard use of tx of RATakes several weeks to work, drug adjusted for
optimum effect at lowest dose
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SclerodermaChronic connective tissue disease (autoimmune)-exact
cause unknownOrgan-specific disease!Not contagious or cancerous; most common in middle-
aged womenNot directly inherited, possibly a family hx of rheumatic
diseasesS/S: chronic hardening and thickening of the skin caused
by new collagen formation, skin changes include edema and pallor, then firmness of the skin; systemic scleroderma is due to injury to blood vessels and to fibrosis or scarring and the
Blood vessel injury leads to Raynauds, kidney disease, pulmonary HTN or other manifestations
TX: Localized scleroderma (drugs not proven in clinical trials), Plaquenil, methotrexate (suppress immune function), prednisone, Dilantin (action unclear), phototherapy; treatment aimed at symptoms
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Latex AllergyCommonInitial sx are mild but become worse after
repeated exposure-likely to be allergic to latex if you have other allergies
S/S-pruritis, hives, watery eyes, scratchy throat, dyspnea, lips and/or throat edema-this can lead to DEATH!!!
TX-avoid contact with latex-even condoms, keep epi-pen closeby