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

Question

Explain the pharmacological basis for using diuretics in hypertension with an example. Mention two antihypertensives used in pregnancy. (3+1)

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Answer

Pharmacological basis for diuretics in hypertension Diuretics (e.g. Hydrochlorothiazide) initially lower blood pressure by promoting natriuresis, reducing plasma/extracellular fluid volume and hence cardiac output. With continued use, plasma volume partially normalizes, but blood pressure remains lowered because of a sustained reduction in peripheral vascular resistance — thought to result from a small persistent negative sodium balance reducing vascular smooth muscle Na⁺ content, which lowers vessel wall stiffness/reactivity to vasoconstrictor stimuli. This makes thiazide diuretics an effective, low-cost first-line antihypertensive, particularly in the elderly.

Two antihypertensives used in pregnancy Methyldopa and Labetalol (Nifedipine is a further alternative) — chosen for their established safety profile in pregnancy, unlike ACE inhibitors/ARBs, which are teratogenic.

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