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Zorluk: ZorGeneral Internal Medicine

A 6262-year-old man is hospitalized on the general medical ward for a severe exacerbation of chronic obstructive pulmonary disease and suspected superimposed pneumonia. He is prescribed a new regimen of intravenous piperacillin-tazobactam. 1010 minutes into the first infusion, the rapid response team is called because the patient suddenly develops diffuse urticaria, facial swelling, a high-pitched inspiratory noise, and profound shortness of breath. His vital signs reveal a blood pressure of 80/4580/45 mm Hg, a heart rate of 128128/min, and an oxygen saturation of 88%88\% on room air. Arrange the following acute management steps in the most appropriate chronological sequence according to established life-support guidelines.

  1. 1Immediately halt the intravenous infusion of piperacillin-tazobactam.
  2. 2Administer intramuscular epinephrine into the anterolateral thigh.
  3. 3Place the patient in a supine position with elevated lower extremities and initiate rapid intravenous normal saline resuscitation.
  4. 4Administer adjunctive intravenous glucocorticoids and antihistamines.
  5. 5Obtain a serum tryptase level.

Cevap

The correct sequence is to first halt the offending infusion, immediately administer intramuscular epinephrine, optimize hemodynamics with positioning and intravenous fluids, administer adjunctive antihistamines and steroids, and finally obtain a serum tryptase level once the patient is stabilized.
In the management of anaphylaxis, the offending agent must first be removed. Intramuscular epinephrine is the definitive first-line therapy because its alpha-1 and beta-2 agonist properties immediately reverse peripheral vasodilation and bronchoconstriction. Hemodynamic support with supine positioning and intravenous fluids is the next critical step to manage distributive shock. Antihistamines and glucocorticoids are second-line, adjunctive therapies that provide delayed symptomatic relief and may prevent biphasic reactions; they must never delay epinephrine administration. Finally, drawing a serum tryptase level is a diagnostic step performed after acute stabilization.

Adım Adım Çözüm

1
Recognize the clinical presentation of anaphylactic shock.
The patient's sudden urticaria, angioedema, stridor, and hypotension shortly after starting a beta-lactam antibiotic confirm IgE-mediated anaphylaxis.
Accurate recognition is critical to immediately initiate the life-saving anaphylaxis protocol rather than mistakenly treating for an isolated COPD exacerbation.
2
Prioritize interventions based on immediate life-saving potential.
Stopping the trigger and administering epinephrine are identified as the paramount first steps.
Epinephrine is the only medication that rapidly reverses the life-threatening cardiovascular and airway complications of anaphylaxis.
3
Sequence hemodynamic support and adjunctive therapies.
Fluids and positioning are sequenced before antihistamines and steroids.
Fluids combat the acute distributive shock. Antihistamines and steroids have no immediate effect on shock or airway obstruction and must never delay epinephrine or fluid resuscitation.
4
Determine the timing for diagnostic laboratory testing.
Serum tryptase is ordered as the final step.
Diagnostic testing should only occur after the patient is clinically stable. Furthermore, tryptase levels peak 11 to 22 hours post-event, making immediate measurement less useful.

Anahtar Kavram

The management of anaphylaxis follows a strict hierarchy: immediate cessation of the trigger, prompt intramuscular epinephrine, supportive hemodynamic resuscitation (fluids and positioning), followed by delayed-onset adjunctive pharmacotherapy (antihistamines and steroids), and subsequent diagnostic testing.
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General Internal Medicine

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