Arterial Blood Gases
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This document discusses the interpretation of arterial blood gas results, including normal values and various acid-base abnormalities. It defines respiratory acidosis, respiratory alkalosis, metabolic acidosis, metabolic alkalosis, and their combinations. It also explains the concepts of respiratory compensation, metabolic compensation, and complete compensation in response to acid-base disturbances.
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Arterial Blood Gases
- 1. Dr. Abid Ullah (PT) DPT (GU), BCST-MSK (RIU), MS-OMPT (RIU), PgD.HM (HSA) Physiotherapist LRH-MTI, Peshawar Arterial Blood Gases Interpretation
- 2. Arterial Blood Gases Interpretation At the end of this lecture you will be able to Interpret: • Respiratory Acidosis • Respiratory Alkalosis • Metabolic Acidosis • Metabolic Alkalosis • Respiratory Compensation • Metabolic Compensation • Partial Compensated Metabolic Acidosis • Complete Compensated Metabolic Acidosis • Partial Compensated Metabolic Alkalosis • Complete Compensated Metabolic Alkalosis
- 3. Arterial Blood Gases Interpretation Normal values PH = 7.35 – 7.45 PCO2 = 35 -45 mmHg HCOˉ3 = 22 -26 mEq/L PO2 = 80 – 100 mmHg CO2 + H2O H2CO2 HCOˉ3 + H + Respiratory Metabolic Respiratory Acidosis Respiratory Alkalosis PH PCO2 HCOˉ3 = Normal PH PCO2 HCOˉ3 = Normal Metabolic Acidosis PH HCOˉ3 PCO2 = Normal Metabolic Acidosis PH HCOˉ3 PCO2 = Normal PH = 7.31 PCO2 = 60 mmHg HCOˉ3 = 24 mEq/L Respiratory Acidosis PH = 7.48 PCO2 = 30 mmHg HCOˉ3 = 24 mEq/L Respiratory Alkalosis PH = 7.31 PCO2 = 40 mmHg HCOˉ3 = 17 mEq/L Metabolic Acidosis PH = 7.48 PCO2 = 42 mmHg HCOˉ3 = 30 mEq/L Metabolic Alkalosis
- 4. Respiratory Compensation Normal values PH = 7.35 – 7.45 PCO2 = 35 -45 mmHg HCOˉ3 = 22 -26 mEq/L PO2 = 80 – 100 mmHg CO2 + H2O H2CO2 HCOˉ3 + H + Respiratory Metabolic Respiratory Compensation Metabolic Acidosis PH HCOˉ3 PCO2 Partial compensated PH = Near Normal Complete compensated PH = Normal Hyperventilated Metabolic Alkalosis PH HCOˉ3 PCO2 Hypoventilated Partial compensated PH = Near Normal Complete compensated PH = Normal PH = 7.31 PCO2 = 18 mmHg HCOˉ3 = 19 mEq/L Partially Compensated Metabolic Acidosis PH = 7.49 PCO2 = 60 mmHg HCOˉ3 = 30 mEq/L Partially Compensated Metabolic Alkalosis
- 5. Renal Compensation Normal values PH = 7.35 – 7.45 PCO2 = 35 -45 mmHg HCOˉ3 = 22 -26 mEq/L PO2 = 80 – 100 mmHg CO2 + H2O H2CO2 HCOˉ3 + H + Respiratory Metabolic Renal Compensation Respiratory Acidosis PH HCOˉ3 PCO2 Partial compensated PH = Near Normal Complete compensated PH = Normal Respiratory Alkalosis PH HCOˉ3 PCO2 Partial compensated PH = Near Normal Complete compensated PH = Normal PH = 7.31 PCO2 = 60 mmHg HCOˉ3 = 35 mEq/L Partially Compensated Respiratory Acidosis PH = 7.49 PCO2 = 25 mmHg HCOˉ3 = 16 mEq/L Partially Compensated Respiratory Alkalosis
- 6. Combined Respiratory & Metabolic (Acidosis & Alkalosis) Normal values PH = 7.35 – 7.45 PCO2 = 35 -45 mmHg HCOˉ3 = 22 -26 mEq/L PO2 = 80 – 100 mmHg CO2 + H2O H2CO2 HCOˉ3 + H + Respiratory Metabolic Combined Respiratory & Metabolic Acidosis PH PCO2 HCOˉ3 PH PCO2 HCOˉ3 PH = 7.31 PCO2 = 60 mmHg HCOˉ3 = 19 mEq/L Combined Respiratory & Metabolic Acidosis PH = 7.49 PCO2 = 20 mmHg HCOˉ3 = 30 mEq/L Combined Respiratory & Metabolic Alkalosis Combined Respiratory & Metabolic Alkalosis
- 7. Complete Compensation interpretation Normal values PH = 7.35 – 7.45 PCO2 = 35 -45 mmHg HCOˉ3 = 22 -26 mEq/L PO2 = 80 – 100 mmHg CO2 + H2O H2CO2 HCOˉ3 + H + Respiratory Metabolic PH = 7.43 PCO2 = 25 mmHg HCOˉ3 = 19 mEq/L Compensated Respiratory Alkalosis PH = 7.37 PCO2 = 60 mmHg HCOˉ3 = 30 mEq/L Compensated Respiratory Acidosis 7.35 7.36 7.37 7.38 3.39 Acidotic Side 7.41 7.42 7.43 7.44 7.45 Alkalotic Side PH = 7.43 PCO2 = 60 mmHg HCOˉ3 = 30 mEq/L Compensated Metabolic Alkalosis PH = 7.37 PCO2 = 25 mmHg HCOˉ3 = 19 mEq/L Compensated Respiratory Acidosis