Hyponatraemia (serum Na under 135 mmol/L) is the commonest inpatient electrolyte disorder and reflects an excess of total body water relative to sodium, almost always mediated by non-osmotic vasopressin (ADH). Full topic, figures, and citations: https://medvellum.com/topics/hyponatraemia Chapters 00:00 The one-line answer 01:27 Meet the patient 02:08 Red flags 04:25 Dial 1 — serum osmolality (turn this first, always) 06:13 How common, how lethal 06:53 The bedside assessment — volume status decides everything 07:19 Step 4 — confirmatory and cause-finding tests 08:30 The emergency — 3% saline…
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