1. Blood Gas Interpretation Ayman I. Abou Mehrem, MD Assistant Consultant King Abdulaziz Hospital

4. Components of BG Blood Gas Oxygenation Ventilation Acid-Base PaO 2 SaO 2 PCO 2 pH HCO 3 -BE

6. Normal ABG Is it the same for a preterm baby?

7. NO Answer

9. Target Blood Gas in Neonates * * Goldsmith and Karotkin, Assisted Ventilation of the Neonate, 4 th edition, Saunders 50-80 80-120 50-70 45-65 PaO 2 55-65 30-40 45-55 45-55 PaCO 2 7.35-7.45 7.30-7.50 ≥ 7.25 ≥ 7.25 pH Infant with BPD Term with PPHN 28-40 weeks’ GA < 28 weeks’ GA

11. What may go wrong in ABG? Hypoxia Respiratory Acidosis Respiratory Alkalosis Metabolic Alkalosis Metabolic Acidosis

13. Acid-Base Disorders PaCO 2 HCO 3 pH

25. Steps to ABG Interpretation Primary Acid-Base Disorders (No compensation) ↓ normal ↓ Metabolic Acidosis ↑ normal ↑ Metabolic Alkalosis normal ↓ ↑ Respiratory Alkalosis normal ↑ ↓ Respiratory Acidosis HCO 3 PaCO 2 pH

26. Steps to ABG Interpretation Partially Compensated Acid-Base Disorders ↓ ↓ ↓ Metabolic Acidosis ↑ ↑ ↑ Metabolic Alkalosis ↓ ↓ ↑ Respiratory Alkalosis ↑ ↑ ↓ Respiratory Acidosis HCO 3 PaCO 2 pH

27. Steps to ABG Interpretation Fully Compensated Acid-Base Disorders ↓ ↓ normal, but < 7.4 Metabolic Acidosis ↑ ↑ normal, but > 7.4 Metabolic Alkalosis ↓ ↓ normal, but > 7.4 Respiratory Alkalosis ↑ ↑ normal, but < 7.4 Respiratory Acidosis HCO 3 PaCO 2 pH

28. Steps to ABG Interpretation

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