I now have all the information needed for a comprehensive answer on anaphylaxis. Let me note that "kandedisis" = candidiasis and "spin disorder" most likely means spinal disorder - but together "anaphylaxis kandedisis spin disorder" does not match a recognized combined medical entity. The query appears to be about anaphylaxis as the primary topic, with possible phonetic misspellings. I'll provide a full, detailed answer on anaphylaxis.
Anaphylaxis - Full Details and Treatment
Note on your query: "Kandedisis" appears to be a phonetic spelling of candidiasis (fungal infection), and "spin disorder" may refer to a spinal condition. However, these are not combined with anaphylaxis as a single recognized syndrome. I have interpreted your query as primarily asking about anaphylaxis in full detail. If you meant something different, please clarify.
Definition
Anaphylaxis is a severe, life-threatening, systemic hypersensitivity reaction that occurs rapidly after exposure to an allergen. It involves activation of mast cells and basophils, leading to massive release of inflammatory mediators (histamine, tryptase, leukotrienes, prostaglandins) that cause multi-organ dysfunction.
Epidemiology
- Estimated to occur in roughly 2% of the worldwide population and up to 5% in the United States
- Fatal anaphylaxis is rare, representing less than 1% of cases
- Prevalence and hospital admissions have increased over the past two decades
- Food-induced fatalities increasing in Australia; medication-induced fatalities increasing in North America
Risk Factors
Who is at higher risk of having anaphylaxis:
- Pregnant women, infants, teenagers, elderly
- History of atopy (genetic predisposition to allergic disease)
- Higher socioeconomic status
- Seasonal: summer and fall (outdoor seasons)
- Emotional stress, acute infection, physical exertion
- History of mastocytosis
- Parenteral route of drug administration (higher risk than oral)
Risk factors for increased severity and mortality:
- Extremes of age (very young: under-recognition; elderly: reduced physiologic reserve)
- Comorbid cardiovascular disease (heart failure, ischemic heart disease, hypertension)
- Pulmonary disease (asthma, obstructive airway disease)
- Concurrent use of beta-blockers and ACE inhibitors (worsen severity)
- Concurrent use of cognition-impairing drugs (alcohol, sedatives)
- Upright posture at onset of symptoms
- Recent prior anaphylaxis episode
Common Triggers
IgE-Dependent (Immunologic)
| Category | Examples |
|---|
| Foods | Peanuts, tree nuts, shellfish, fish, cow's milk, eggs, soy, mammalian meats (alpha-gal, after tick bite) |
| Medications | Antibiotics (penicillin, cephalosporins), NSAIDs, chemotherapeutic agents, immunomodulators |
| Insect stings | Hymenoptera venoms (wasps, bees, ants), fire ant stings |
| Natural rubber latex | Gloves, medical equipment, balloons, condoms |
| Hormones | Insulin, methylprednisolone, estradiol, progesterone |
| Local anesthetics | Ester family (procaine, tetracaine, benzocaine) |
| Radiocontrast media (RCM) | Iodinated contrast agents |
| Aeroallergens | Pollen, dust, spores, pet dander |
IgE-Independent (Immunologic)
- RCM, NSAIDs, dextrans, monoclonal antibodies/immunomodulators
Non-Immunologic (Direct Mast Cell Activation)
- Physical factors: exercise, cold, heat, sunlight
- Ethanol, some opioids
- Idiopathic (no trigger found in up to 60% of adults)
Important drug note: NSAIDs are the most common trigger of drug-induced anaphylaxis, acting through interruption of arachidonic acid metabolism (non-IgE mechanism). ACE inhibitors worsen angioedema by increasing bradykinin. Beta-blockers oppose the effects of epinephrine used in treatment.
Pathophysiology
- Sensitization phase: On first allergen exposure, IgE antibodies are produced and bind to mast cells and basophils via high-affinity IgE receptors (FcεRI)
- Activation phase: On re-exposure, the allergen cross-links IgE on mast cells/basophils, triggering degranulation
- Mediator release: Massive release of:
- Preformed: Histamine, tryptase, heparin
- Newly synthesized: Prostaglandins, leukotrienes, platelet-activating factor
- Systemic effects: Vasodilation, increased vascular permeability, bronchospasm, smooth muscle contraction, mucus secretion
Clinical Manifestations
Signs and symptoms usually begin suddenly within 60 minutes of exposure (often immediately). The faster the onset, the more severe the reaction - half of anaphylactic fatalities occur within the first hour.
| System | Signs & Symptoms |
|---|
| Skin/Mucosa (80-90%) | Urticaria (hives), flushing, pruritus, angioedema |
| Respiratory | Stridor, wheezing, bronchospasm, dyspnea, laryngeal edema, oropharyngeal/throat fullness (50%), tongue swelling (1-2%) |
| Cardiovascular | Hypotension, tachycardia, cardiovascular collapse, syncope |
| GI | Nausea, vomiting, diarrhea, abdominal cramps |
| CNS | Dizziness, anxiety, confusion, loss of consciousness |
| ENT | Oropharyngeal fullness, nasal congestion, rhinorrhea, sneezing |
Biphasic anaphylaxis: After initial symptoms abate, a second phase of mediator release (primarily leukotrienes) can peak 8-11 hours later, with clinical symptoms appearing 3-4 hours after the initial reaction clears. Incidence: ~4-5% in prospective studies (up to 20% in some reports). Severe anaphylaxis or need for repeated epinephrine increases biphasic risk.
Diagnosis
Diagnosis is clinical. Consider anaphylaxis when 2 or more body systems are involved, with or without hypotension or airway compromise.
Key diagnostic criteria (any of the following):
- Acute onset of skin/mucosal symptoms PLUS respiratory compromise OR hypotension
- Two or more of the following after allergen exposure: skin/mucosal involvement, respiratory compromise, hypotension, persistent GI cramps or vomiting
- Hypotension after exposure to a known allergen
Differential diagnosis:
- Vasovagal reaction (most common imitator - hypotension + bradycardia + pallor, unlike anaphylaxis which has tachycardia)
- Myocardial ischemia/infarction
- Severe acute asthma
- Hereditary angioedema
- Carcinoid syndrome
- Mastocytosis
- Epiglottitis, foreign body airway obstruction
- Seizure
Lab tests are of minimal acute utility:
- Serum tryptase: Elevated for several hours; useful for later confirmation, but poor sensitivity (1/3 of patients have normal levels)
- Serum histamine: Elevated only 5-30 minutes after reaction, usually normal by ED arrival
Treatment
Immediate Management Algorithm
Step 1 - Epinephrine (FIRST LINE - given IMMEDIATELY)
Epinephrine is the sole first-line medication. Delay in administration is associated with increased hospitalization, hypoxic encephalopathy, and death. Despite guidelines, only ~30% of patients receive it in the prehospital setting.
| Route | Adult Dose | Pediatric Dose |
|---|
| IM (preferred) | 0.3-0.5 mg (0.3-0.5 mL of 1:1000) into vastus lateralis (lateral thigh) | 0.01 mg/kg (max 0.5 mg) IM |
| EpiPen | 0.3 mg auto-injector | EpiPen Jr 0.15 mg |
| IV bolus (if refractory) | 100 mcg over 5-10 min (0.1 mL of 1:1000 in 10 mL NS) | - |
| IV infusion (cardiovascular collapse) | Start at 1 mcg/min; titrate as needed | 0.1-0.3 mcg/kg/min; max 1.5 mcg/kg/min |
- Can be repeated every 5-10 minutes (up to 30% require more than one dose)
- IM in the lateral thigh gives peak plasma levels in 8 minutes vs. subcutaneous (34 minutes)
- Subcutaneous and inhalation routes are no longer recommended
Step 2 - Positioning
- Hypotensive patients: supine with legs elevated
- Airway difficulty/vomiting: comfortable position, elevate legs if possible
- Pregnant women: left lateral decubitus (prevents vena cava compression)
Step 3 - Monitoring and Supportive Care
- Continuous cardiac monitoring and pulse oximetry
- IV access
- Supplemental oxygen (titrate to SpO2 ≥90%)
Step 4 - IV Fluids
- Normal saline or Lactated Ringer's: 1-2 L IV bolus in adults; 10-20 mL/kg bolus in children
Second-Line Medications (Adjuncts - do NOT replace epinephrine)
| Drug | Adult Dose | Pediatric Dose |
|---|
| H1 Blocker - Diphenhydramine | 25-50 mg IV/IM/PO every 6h | 1 mg/kg IV/IM/PO every 6h |
| H2 Blocker - Ranitidine | 50 mg IV over 5 min | 0.5 mg/kg IV over 5 min |
| H2 Blocker - Cimetidine | 300 mg IV | 4-8 mg/kg IV |
| Hydrocortisone | 250-500 mg IV | 5-10 mg/kg IV (max 500 mg) |
| Methylprednisolone | 80-125 mg IV | 1-2 mg/kg IV (max 125 mg) |
| Prednisone (oral) | 40-60 mg PO daily | 1-2 mg/kg/day PO |
Antihistamines and corticosteroids have no objective evidence of improving overall outcome in acute anaphylaxis. They are given as adjuncts only. Corticosteroids may reduce biphasic reactions.
For bronchospasm (add):
- Albuterol (salbutamol) nebulized - standard bronchodilator doses
For patients on beta-blockers (refractory hypotension):
- Glucagon: 1-5 mg IV (bypasses beta-receptor blockade)
- Vasopressors: Norepinephrine, vasopressin, dopamine
Refractory Anaphylaxis Protocol (Box 106.4 - Pre-procedure prophylaxis for contrast-induced reactions)
- Prednisone 50 mg PO at 13h, 7h, and 1h before procedure
- Diphenhydramine 50 mg PO 1h before
- Consider ephedrine 25 mg PO 1h before
- Consider H2 antagonist (famotidine 20 mg PO) 3h before
Observation and Discharge
Observation:
- All patients should be observed after treatment until symptoms fully resolve
- Prolonged observation for: past history of severe reaction, beta-blocker use, lives alone, lives far from medical care, elderly, significant comorbidities (especially asthma)
- Biphasic risk is highest in the first 8-11 hours
Discharge medications:
- Antihistamines: Diphenhydramine 25-50 mg PO every 6-8h for 3-5 days
- Corticosteroids: Prednisone 40-60 mg PO daily for 3-5 days (longer 1-2 weeks for idiopathic anaphylaxis to reduce relapses)
- Epinephrine autoinjector (EpiPen) x 2 - prescribed for all patients; prescribe enough for multiple locations (home, car, work)
Discharge instructions:
- Identify and avoid the triggering allergen
- Wear medical alert identification (e.g., MedicAlert bracelet)
- Education on how to use the autoinjector (less than 1/3 of patients can demonstrate correct use)
- Switch patients on beta-blockers to a different therapeutic class
- Referral to allergist for patients with severe or frequent reactions
Key Points Summary
- Epinephrine IM is the only first-line drug - give it immediately, never delay
- Lateral thigh (vastus lateralis) is the preferred injection site
- Antihistamines and corticosteroids are second-line adjuncts only - they do NOT save lives acutely
- Biphasic anaphylaxis can occur 3-4 hours after initial reaction - observe all patients
- Beta-blockers and ACE inhibitors worsen severity and make treatment harder
- Always prescribe an EpiPen at discharge and educate on its use
Sources: ROSEN's Emergency Medicine, Tintinalli's Emergency Medicine, Textbook of Family Medicine 9e, The Washington Manual of Medical Therapeutics