40 so 2 oxygen saturation it is used to assess a

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will be maintained (resulting in a pH of 7.40). SO 2 = Oxygen Saturation It is used to assess a patient’s oxygen status; it represents the ratio of O 2 that is bound to the carrier protein, hemoglobin, compared w/ the total amount of hemoglobin capable of binging O 2 COHb = Carboxyhemoglobin Hemoglobin bound to CO; the bond between CO and Hb is reversible but is 200 times as strong as the bond between O 2 and Hb; measured w/ cooximeter (spectrophotometer) pO2 the amount of hemoglobin dissolved in plasma; used to assess a patient’s oxygen status; 4. Given a set of blood gas results, determine whether data are normal or represent metabolic or respiratory acidosis or alkalosis. ***See case studies in Chapter 16 5. List some common causes of metabolic acidosis and alkalosis and respiratory acidosis and alkalosis. State how the body attempts to compensate for each condition. Metabolic Acidosis Causes: Admin. Of acid-producing substances (CaCl, Ammonium Cl) Diabetic Ketoacidosis Reduced excretion of acids – renal tubules Excessive loss of HCO3- diarrhea, biliary drainage, pancreatic or intestinal fistula Compensation Hyperventilation Secondary – retain HCO3- Respiratory Acidosis Causes:
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Blood Gases/Acid-Base Balance – Objectives Hypoventilation – COPD, bronchopneumonia, drugs, CHF Compensation Kidneys – increase H+ excretion and reclaim HCO3- Metabolic Alkalosis Causes: Excess admin. Sodium bicarbonate
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