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ABG ANALYSIS AND INTERPRETATION

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An ABG is the most accurate representation of a patient’s clinical status and correct interpretation can lead to quicker and more accurate changes in the plan of care.

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ABG ANALYSIS AND INTERPRETATION

  1. 1. ABG ANALYSIS AND INTERPRETATION BY RAJEE RAVINDRAN
  2. 2. What is ABG ? OXYGENATION VENTILATION ACID- BASE PaO2 SaO2 PCO2 PH HCO3
  3. 3. PaO2 Oxygen molecule dissolved in plasma SaO2 Oxygen bound to haemoglobin
  4. 4. SITE SELECTION RADIAL ARTERY FEMORAL ARTERY BRACHIAL ARTERY 45 INSERTION ANGLE 60 - 90 90 DISADVANTAGES of Brachial and femoral artery  They are less superficial than radial artery  Poor collateral circulation
  5. 5. PROCEDURE
  6. 6. A TRAY CONTAINING Sterile Gloves Inj. Heparin 1:1000 Syringe – 1ml/ 2ml Needles – 23G, 24G, 26G Small Towel Spirit swab Dry gauze Micropore Ice pack
  7. 7. Always mention O2, Fio2 and temperature of patient Twirl syringe to mix heparin with sample Place the sample on an ice pack Hold pressure for 5-10 minutes Wait 30 minutes before drawing sample if O2 setting changed Remove air bubble
  8. 8. TECHNICAL ERRORS
  9. 9. • AIR BUBBLE (ELEVATES PaO2 significantly and decreases PCo2) • Collection of venous rather than arterial blood • Not mentioning about oxygen support • Patient having Hypothermia or hyperthermia • Size of syringe • Volume of syringe (syringes must have >50%) • Excessive heparin results in decreased pc02 and HCO3 values (ideally flushed with 0.5ml heparin1:1000) Delayed processing yield falsely low Pao2
  10. 10. COMPLICATIONS • ARTERIOSPASM or involuntary contraction of the artery • HEMATOMA or excessive bleeding • NERVE DAMAGE • VASOVAGAL RESPONSE or fainting
  11. 11. INTERPRETATION
  12. 12. PH 7.35- 7.45  PH 7.45  PH 7.35
  13. 13. PaCO2 35- 45 RESPIRATORY HCO3 22-28 METABOLIC RESPIRATORY ALKALOSIS RESPIRATORY ACIDOSIS METABOLIC ALKALOSIS METABOLIC ACIDOSIS PH PCO2 HCO3
  14. 14. pH 7.51, pCO2 40, HCO3- 31: A. Normal B. Uncompensated metabolic alkalosis C. Partially compensated respiratory acidosis D. Uncompensated respiratory alkalosis
  15. 15. PH 7.40, pCO2 40, HCO3- 24: A. Normal B. Uncompensated metabolic acidosis C. Partially compensated respiratory acidosis D. Partially compensated metabolic acidosis
  16. 16. PH 7.33, pCO2 29, HCO3- 16: A. Uncompensated respiratory alkalosis B. Uncompensated metabolic acidosis C. Partially compensated respiratory acidosis D. Partially compensated metabolic acidosis
  17. 17. PH 7.62, pCO2 47, HCO3- 30: A. Uncompensated metabolic alkalosis B. Uncompensated respiratory alkalosis C. Partially compensated respiratory alkalosis D. Partially compensated metabolic alkalosis

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