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ABG Interpretation
 
 

Metabolic Alkalosis

February 15th, 2021
 
 
 
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Overview

  • Look For

  • Alkalaemia with raised bicarbonate.
  • Expected Compensation

  • Increase in PaCO₂ = 0.8 x HCO₃ + 20
  • Causes of Metabolic Alkalosis

  • Bicarbonate excess - milk alkali syndrome (antacids), massive transfusion, dialysis
  • GI acid loss - vomiting, NG aspirates, gastric fistula
  • Renal acid loss - diuretics, hyperaldosteronism, Cushing's, steroids
  • Compartmental shift - hypokalaemia
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