Paper I
2022 October (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Adrenaline

Q43 marksShort Notes

Answer

Adrenaline (epinephrine) is a direct-acting sympathomimetic acting on alpha-1, beta-1, and beta-2 receptors.

Actions: alpha-1 — vasoconstriction (skin, mucosa, splanchnic bed); beta-1 — increased heart rate and force of contraction; beta-2 — bronchodilation and vasodilation in skeletal muscle. Net effect on blood pressure: raises systolic, may lower diastolic (beta-2 vasodilation at low doses).

Uses: anaphylactic shock (drug of choice — reverses hypotension, bronchospasm, and laryngeal edema simultaneously), cardiac arrest (restores spontaneous circulation), added to local anesthetics to prolong action and reduce systemic absorption, superficial bleeding control (topical).

Adverse effects: anxiety, tremor, palpitations, arrhythmias, hypertension (risk of cerebral hemorrhage), can precipitate angina in ischemic heart disease.

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