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Nocturnal polyuria associated with dependent oedema due to chronic venous insufficiency — MSRA MCQ

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HardLUTSNocturnal polyuria associated with dependent oedema due to chronic venous insufficiencyMSRA

A 78-year-old man is reviewed for persistent nocturia. His previous weak stream and hesitancy are well controlled with tamsulosin MR 400 micrograms once daily. He has no urgency, urge urinary incontinence, dysuria, haematuria, sensation of incomplete emptying or recurrent urinary tract infection. A 3-day frequency-volume chart records three nocturnal voids each night, with voided volumes of 300–360 mL. His nocturnal urine volume is 980 mL and his total 24-hour urine output is 2100 mL. Daytime voided volumes are normal, with no frequent small-volume voids. He has bilateral dependent ankle oedema from chronic venous insufficiency that resolves overnight. He has no heart failure, diabetes mellitus, obstructive sleep apnoea, renal impairment or hypercalcaemia. His eGFR is 74 mL/min/1.73 m² and serum sodium is 139 mmol/L. Fluid advice, leg elevation and compression hosiery have not adequately improved his symptoms. What is the most appropriate pharmacological management?

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Correct answer: A — Consider a late-afternoon loop diuretic, with documented discussion of its unlicensed use for nocturnal polyuria

The frequency-volume chart demonstrates nocturnal polyuria: 980 mL is approximately 47% of his 24-hour urine output, exceeding the NICE threshold of one-third overnight output. The large nocturnal voided volumes, normal daytime volumes and absence of urgency or small-volume frequency argue against detrusor overactivity. His controlled voiding symptoms also make persistent bladder-outlet obstruction an unlikely explanation. Dependent oedema from chronic venous insufficiency is a recognised medical contributor to nocturnal polyuria. Recumbency mobilises peripheral fluid overnight, increasing nocturnal diuresis. NICE therefore advises considering a late-afternoon loop diuretic for men with nocturnal polyuria. This aims to shift diuresis into the late afternoon or early evening. Loop diuretics are not licensed specifically for nocturnal polyuria, so the prescribing rationale and discussion should be documented. Desmopressin is not the best next step. NICE reserves it for nocturnal polyuria after other medical causes have been excluded and other treatments have not helped. Moreover, the Noqdirna SmPC contraindicates use where fluid-overload conditions require diuretic treatment. Solifenacin would be appropriate for persistent urgency-associated storage symptoms, which are absent. Finasteride addresses progression risk in appropriate benign prostatic enlargement, not excessive overnight urine production. Escalating alpha-blockade would not alter nocturnal urine production.

Reference: NICE CG97: Lower urinary tract symptoms in men: management — Recommendations 1.4.8–1.4.10 (Published 2010; last updated 2015) — https://www.nice.org.uk/guidance/cg97/chapter/recommendations NICE QS45: Lower urinary tract symptoms in men — Quality statement 2: Initial assessment – urinary frequency and volume chart (2013) — https://www.nice.org.uk/guidance/QS45/chapter/quality-statement-2-initial-assessment-urinary-frequency-and-volume-chart Noqdirna 50 microgram oral lyophilisate — Summary of Product Characteristics (Last updated 15 June 2026) — https://www.medicines.org.uk/emc/product/4372/smpc