Spot Urine Sodium in AHF — EECC MCQ

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ModerateHeart FailureSpot Urine Sodium in AHFEECC

A 55-year-old man with acute decompensated HF has initial management with IV furosemide. On day 2, his spot urine sodium is measured at 30 mmol/L (2 hours after IV furosemide dose). What does this indicate?

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Correct answer: E — Spot urine sodium <50-70 mmol/L at 2 hours post-loop diuretic predicts inadequate natriuretic response; the diuretic dose should be escalated or combination diuretic therapy added

Spot urine sodium measurement 1-2 hours after IV loop diuretic administration is an emerging tool for early assessment of diuretic response. A urine sodium >50-70 mmol/L indicates adequate tubular drug delivery and natriuretic effect. Values below this threshold predict inadequate diuresis and allow earlier escalation of diuretic strategy (dose doubling, adding metolazone, or adding acetazolamide) rather than waiting 6-24 hours for total urine output assessment. This approach was validated in the ENACT-HF study and is incorporated in the ESC 2023 HF Guidelines as a pragmatic bedside tool for guiding diuretic management in acute HF.

Reference: ESC (2023): HF Guidelines