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Zorluk: OrtaInitial Stabilization and Triage

While doing yard work, a 65-year-old man experiences a sudden onset of severe dyspnea, dizziness, and a diffuse rash. His wife immediately drives him to the nearest emergency room. The patient has a known past medical history of a myocardial infarction two years prior, as well as hypertension and type 2 diabetes mellitus. His prescribed medications include aspirin, metoprolol, lisinopril, and metformin.

Upon arrival at the triage desk, he appears extremely restless, is profusely diaphoretic, and can only speak in one-word gasps.

Vital signs reveal a temperature of 37.1°C (98.8°F), blood pressure of 78/42 mmHg, heart rate of 134/min, respiratory rate of 28/min, and oxygen saturation of 89% on ambient air.

Physical examination demonstrates significant periorbital swelling and widespread raised, erythematous plaques across his torso and limbs. Auscultation of the lungs reveals prominent bilateral expiratory wheezing.

Which of the following represents the most appropriate immediate next step in stabilizing this patient?

  1. A
    Administer a bolus of epinephrine via a peripheral intravenous line
  2. B
    Infuse diphenhydramine and hydrocortisone intravenously
  3. Inject epinephrine intramuscularly into the anterolateral thighCevap
  4. D
    Arrange for an immediate bedside portable chest radiograph
  5. E
    Request an emergent cardiology evaluation for cardiogenic shock

Cevap

The correct answer is to inject epinephrine intramuscularly into the anterolateral thigh.
This patient is presenting with anaphylactic shock, likely triggered by an insect sting while doing yard work. The diagnosis is clinical, characterized by the acute onset of respiratory compromise (hypoxia, wheezing) and cardiovascular collapse (severe hypotension, tachycardia), accompanied by characteristic mucocutaneous involvement (periorbital edema, urticaria). The single most appropriate and urgent initial step in the stabilization of a patient with anaphylaxis is the administration of intramuscular epinephrine into the anterolateral thigh. Epinephrine's alpha-1 agonist effects counteract vasodilation and increase blood pressure, while its beta-2 agonist effects promote bronchodilation and inhibit further release of inflammatory mediators from mast cells and basophils. There are no absolute contraindications to intramuscular epinephrine administration in the setting of anaphylaxis—even in a patient with a history of myocardial infarction—because untreated anaphylactic shock is rapidly fatal.

Adım Adım Çözüm

1
Identify the underlying clinical syndrome causing the patient's instability.
The patient is experiencing anaphylactic shock.
The sudden onset of severe dyspnea, hypotension, wheezing, and an urticarial rash following outdoor exposure (likely an insect sting) is the classic presentation of a severe systemic allergic reaction.
2
Determine the highest-priority life-saving intervention.
Immediate administration of intramuscular epinephrine is required.
Epinephrine is the only first-line medication capable of reversing the severe vasodilation, vascular permeability, and bronchoconstriction of anaphylaxis. It must be administered before any diagnostic testing or secondary treatments.

Anahtar Kavram

Immediate administration of intramuscular epinephrine is the primary, life-saving intervention for anaphylactic shock, and should never be delayed by diagnostic testing, subspecialty consultations, or the administration of secondary adjunctive medications.
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Initial Stabilization and Triage

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