Hyponatraemia diagnostic algorithm

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  • Created by: MazzaW
  • Created on: 08-12-19 16:18
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  • Hypo-natraemia
    • Factitious? (Check glucose)
      • Euvolaemic
        • Urine Na >40 or osmolality >100
          • SIADH, gluco-corticoid deficiency, severe hypo-thyroidism, chronic water load
        • Urine Na < 40 or osmolality < 100
          • Acute water load, psychogenic polydipsia, tea and toast/beer diet
      • Hypovolaemic
        • Urine Na >20
          • Adreno-cortical insufficiency, renal failure or disease, diuretics, cerebral salt wasting
        • Urine Na < 20
          • Vomiting, diarrhoea, skin losses
      • Hyper-volaemic
        • Urine Na >20
          • Renal failure or disease
        • Urine Na < 20
          • CCF, cirrhosis, nephrotic syndrome, primary polydipsia

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