Hyponatraemia is a frequent complication after joint replacement surgeries, often arising from fluid and electrolyte imbalances in the postoperative period. In a new article published in BMC Nephrology, Mamdouh Hefny, Raheel Faiz, Alexander Denning, Paul Saunders, and colleagues propose that routine bladder ultrasound scanning integrated into postoperative fluid management can significantly reduce the incidence of hyponatraemia. By distinguishing urinary retention from true acute kidney injury, the authors argue that more appropriate, tailored fluid administration becomes possible, decreasing the risk of dilutional hyponatraemia.

The authors studied outcomes before and after implementing a bladder scanning protocol at a single centre. In their retrospective review, hyponatraemia was commo

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