Paper I
2023 July (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Classify antihypertensive. Explain the mechanism of action, uses and adverse effects of ACE inhibitors. (3+3)

Q16 marksEssays

Answer

Classification of antihypertensive drugs

ClassExamples
DiureticsHydrochlorothiazide, Furosemide
ACE inhibitorsEnalapril, Ramipril
Angiotensin receptor blockersLosartan, Telmisartan
Calcium channel blockersAmlodipine, Verapamil
Beta-blockersAtenolol, Metoprolol
Centrally actingMethyldopa, Clonidine

ACE inhibitors — mechanism, uses, adverse effects

  • Mechanism: ACE inhibitorblocks angiotensin-converting enzyme↓angiotensin II formation → reduced vasoconstriction and aldosterone secretion → ↓peripheral resistance, ↓sodium/water retention; also reduces bradykinin breakdown.
  • Uses: hypertension, heart failure (mortality benefit), diabetic nephropathy (renoprotective), post-myocardial infarction.
  • Adverse effects: dry cough, hyperkalemia, first-dose hypotension, angioedema, teratogenicity (contraindicated in pregnancy), acute renal failure in bilateral renal artery stenosis.

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