GTN Venodilation — FRCA Primary MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: D — Venous capacitance vessels causing venodilation at low doses
GTN at low doses acts predominantly on venous capacitance vessels causing venodilation / reduced preload / decreased LVEDP / and reduced myocardial oxygen demand. At higher doses it also dilates arterial vessels and coronary arteries. This preferential venodilation distinguishes it from nitroprusside which dilates both arteries and veins equally.
Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care