Paper I
2024 March (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

Pharmacotherapy of Anaphylactic shock with rationale for use of each drug.

Q124 marksShort Answers

Answer

  • Adrenaline (IM, drug of choice) — alpha-1 action reverses hypotension/vasodilation, beta-1 supports cardiac output, beta-2 relieves bronchospasm and reduces further mediator release — the only drug addressing every life-threatening component simultaneously; given first, before anything else.
  • Oxygen — corrects hypoxia from bronchospasm/laryngeal edema.
  • IV fluids — restore circulating volume lost to capillary leak/vasodilation.
  • Antihistamines (Diphenhydramine, an H1 blocker) — relieve cutaneous symptoms (urticaria, itching); adjunct only, too slow-onset for the acute emergency.
  • Corticosteroids (Hydrocortisone) — do not act acutely, but reduce the risk of a biphasic/delayed recurrence of symptoms.
  • Nebulized Salbutamol — additional bronchodilation if bronchospasm persists despite adrenaline.

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