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  <head>
    <title>018-02 Effective osmoles, renal responses, and safe electrolyte correction</title>
    <ownerName>Integrated Medical Foundations</ownerName>
  </head>
  <body>
    <outline text="Effective osmoles, renal responses, and safe correction">
      <outline text="Concentration versus content">
        <outline text="Plasma sodium is a ratio, not a store"/>
        <outline text="Extracellular volume follows total sodium content"/>
        <outline text="Saline treats hypovolaemia, not every hyponatraemia"/>
        <outline text="Oedema with low sodium despite sodium excess"/>
        <outline text="Isotonic sodium expands extracellular volume"/>
        <outline text="Free water spreads across both compartments"/>
        <outline text="Hypotonic loss cuts volume and raises sodium"/>
        <outline text="Translocational: glucose draws water from cells"/>
        <outline text="Pseudohyponatraemia is a measurement artefact"/>
      </outline>
      <outline text="Reading the urine">
        <outline text="Osmolality shows whether hormone is suppressed"/>
        <outline text="Maximally dilute urine: excess intake or low solute"/>
        <outline text="Concentrated urine means water is retained">
          <outline text="Volume defence, nausea, pain, cortisol, drugs"/>
        </outline>
        <outline text="Urine sodium infers renal sodium avidity">
          <outline text="Low value: underfilling, heart failure, cirrhosis"/>
          <outline text="Higher value: salt loss, diuretics, adrenal deficiency"/>
        </outline>
        <outline text="A late sample describes the treatment response"/>
        <outline text="Falling osmolality after volume restoration"/>
      </outline>
      <outline text="Hyponatraemia and brain adaptation">
        <outline text="Acute hypotonicity drives water into brain cells"/>
        <outline text="Cells lose electrolytes, then organic osmolytes"/>
        <outline text="Adapted brain is vulnerable to rapid rises"/>
        <outline text="Oligodendrocytes and myelin can be injured"/>
        <outline text="Risk: low sodium, malnutrition, alcohol, liver"/>
        <outline text="Severe symptoms: controlled modest prompt rise"/>
        <outline text="Sodium accelerates when hormone switches off"/>
        <outline text="Potassium replacement also raises sodium"/>
        <outline text="Follow the trajectory, not the formula"/>
      </outline>
      <outline text="Hypernatraemia and water loss">
        <outline text="Inadequate water relative to solute"/>
        <outline text="Severe cases signal dependence or impaired thirst"/>
        <outline text="The deficit estimate excludes ongoing loss"/>
        <outline text="Very concentrated urine: extrarenal loss or sodium gain"/>
        <outline text="Dilute urine: hormone deficiency or renal resistance"/>
        <outline text="Central lacks production, nephrogenic lacks response"/>
        <outline text="Causes: neurosurgery, lithium, calcium, potassium, tubules"/>
        <outline text="Chronic hypertonicity accumulates brain osmolytes"/>
        <outline text="Isotonic resuscitation first, then free water"/>
      </outline>
      <outline text="Potassium distribution and excretion">
        <outline text="Small extracellular fraction shifts concentration fast"/>
        <outline text="Insulin and beta two stimulation drive uptake"/>
        <outline text="Acidosis depends on anion and transport response"/>
        <outline text="Principal cells perform the secretion">
          <outline text="Needs potassium, aldosterone, delivery, flow"/>
          <outline text="Low effective volume limits distal delivery"/>
        </outline>
        <outline text="Acid-base with blood pressure organises causes">
          <outline text="Alkalosis with hypertension: mineralocorticoid effect"/>
          <outline text="Alkalosis without hypertension: vomiting, diuretics, salt wasting"/>
          <outline text="Hyperkalaemic normal-gap acidosis: low aldosterone effect"/>
        </outline>
        <outline text="Urine potassium read with volume and intake"/>
      </outline>
      <outline text="Emergency potassium treatment">
        <outline text="Hyperkalaemia kills through conduction failure"/>
        <outline text="Calcium stabilises but does not lower potassium"/>
        <outline text="Insulin with glucose shifts potassium into cells"/>
        <outline text="Bicarbonate suits significant metabolic acidosis"/>
        <outline text="Removal: urine, gastrointestinal binding, dialysis"/>
        <outline text="Monitor glucose for delayed hypoglycaemia"/>
        <outline text="Potassium rebounds if nothing was removed"/>
        <outline text="Oral replacement is safer where feasible"/>
        <outline text="Correct magnesium to hold the replacement"/>
      </outline>
      <outline text="Calcium, magnesium, and refeeding">
        <outline text="Hydrogen and calcium compete for albumin binding"/>
        <outline text="Acute alkalosis lowers the ionised concentration"/>
        <outline text="Direct measurement in critical illness and transfusion"/>
        <outline text="Magnesium governs channels, parathyroid, repolarisation"/>
        <outline text="Deficiency makes potassium and calcium refractory"/>
        <outline text="Kidney failure: accumulation suppresses reflexes"/>
        <outline text="Refeeding drives phosphate, potassium, magnesium inward"/>
        <outline text="Thiamine demand and sodium-water retention rise"/>
        <outline text="Prevention: cautious energy, thiamine, monitoring"/>
      </outline>
      <outline text="Prescribing and verifying">
        <outline text="Resuscitation, maintenance and replacement differ"/>
        <outline text="One bag cannot serve all three purposes"/>
        <outline text="Losses differ in water and electrolyte proportions"/>
        <outline text="Daily weight beats an incomplete balance chart"/>
        <outline text="Look for underfilling and venous congestion"/>
        <outline text="Cumulative sodium exposure from fluids and medicines"/>
        <outline text="The plan states mechanism, pace and monitoring"/>
        <outline text="Unexpected value: check sampling site and handling">
          <outline text="Line contamination, haemolysis, counts, assay method"/>
          <outline text="Danger with electrocardiogram or symptoms: treat now"/>
          <outline text="Trajectory from repeats, tracing, urine, what was given"/>
        </outline>
      </outline>
    </outline>
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