Allergic reactions
exaggerated immune system response to a foreign material
allergen
substance that causes an allergic reaction
anaphylaxis
severe or life-threatening allergic reaction in which blood vessels dilate, causing drop in blood pressure, respiratory tissue swells interfering with airway
common types of allergies
Insects, foods, plants, medications, other (dust, chemical, etc)
What does bronchoconstriction cause
Decreased movement of air in the lungs, leading to wheezing, and difficulty breathing
What happens during the second exposure to an allergen
the antibodies combines with allergen, leading to the release of histamines and other chemicals into bloodstream leading to allergic reaction or anaphylaxis
uriticaria
hives
What happens during the first exposure to an allergen
the immune system forms antibodies in response, it is the body’s attempt to attack foreign substances
what causes itching
irritation of nerve endings
When do severe allergic reactions occur
most often take place immediately but can be delayed 30 minutes or more
signs and symptoms of allergic reactions or anaphylactic shock : SKIN
itching, hives, flushing, swelling, warm tingly feeling in face, mouth, chest, feet and hands
signs and symptoms of allergic reactions or anaphylactic shock : RESPIRATORY
patient report of a feeling of tightness in throat or chest, cough, rapid breathing, labored, noisy breathing, hoarseness, muffled voice, stridor, wheezing
signs and symptoms of allergic reactions or anaphylactic shock : CARDIAC
increased heart rate, decreased blood pressure
signs and symptoms of allergic reactions or anaphylactic shock : GENERAL FINDINGS
itchy watery eyes, headache, runny nose, patient-expressed sense of impending doom
signs and symptoms of allergic reactions or anaphylactic shock : SHOCK
Altered mental status,
Flushed, dry skin or pale, cool, clammy skin
Nausea/vomiting
Changes in vital signs: increased pulse, increased respirations, decreased bp
To be considered a severe allergic reaction or anaphylaxis the patient must have either
respiratory distress OR signs and symptoms of shock (only one needs to be present, pg. 662)
Anaphylactic mental status
syncope, altered mental status, feeling of impending doom
anaphylactic vital signs
tachycardia, hypotension, tachypnea, decreased oxygen saturation
anaphylactic swelling
swelling of face, lips, eyes, tongue, mouth, injection site
anaphylactic skin findings
widespread hives, pallor, diffuse redness
anaphylactic respiratory sounds
Wheezing, muffled voice, stridor
Anaphylactic respiratory complaints
dyspnea, tightness in chest
When Should you reassess a patient after administering epinephrine
2 minutes after
Adult dosage of epinephrine
.3 mg