Download - Fluid
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Fluid management
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plasma interstitial intracellularCationsNa 140 146 12K 4 4 150Ca 5 3 10Mg 2 1 7AnionsCl 103 104 3HCO 24 27 10SO4 1 1 -HPO4 2 2 116Protein 16 5 40
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• Potassium ~50 - 60 meq (1meq/kg/day)• Magnesium – 8-20 meq• Sodium – ~100-120 meq (2meq/kg/day)
Fluid requirements per day
Fluid requirements per hour
First 10kg 100 ml/kg 4 ml/kg
Second 10kg 50 ml/kg 2 ml/kg
Subsequent kgs 20 ml/kg 1 ml/kg
Adults ~ 1.5ml/kg per hour
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Maintenace fluids in post operative patients.
• 1st post op day – only 5% D• 2nd post op day – add Na+• 3rd post op day – add K+
Daily requirements = Normal maintenance + Abnormal losses + Pre-existing deficits
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Secretions Sodium (mmol/L)
Potassium(mmol/L)
Chloride (mmol/L)
Bicarbonate (mmol/L)
Salivary 50 20 40 50
Gastric 50 15 120 20
Duodenal 140 5 80 -
Biliary 140 10 100 40
Pancreatic 140 10 80 80
Jejuno-ileal 130 20 105 30
Faeces 80 10 100 25
Diarrhoea 100 30 50 60
Approximate electrolyte concentrations
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• On going GI loss• CORRECT WITH 0.9% NS and 20 meq K+
(1g=13 mEq)
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• What will be the maintainance IV fluid order for a 70 kg man. POD1. Ng=500ml.