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Oxygen analyzers bb fa11 update


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Oxygen analyzer function, purpose and calibration

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Oxygen analyzers bb fa11 update

  1. 1. Oxygen Analyzers What does it do? How does it work?
  2. 2. Measures the O 2 <ul><li>It is important to know how much oxygen the patient is receiving </li></ul><ul><ul><li>Optimal O 2 </li></ul></ul><ul><ul><li>Decrease the risk of O 2 toxicity </li></ul></ul><ul><ul><li>Titrate O 2 for patient’s needs </li></ul></ul><ul><ul><ul><li>Monitor ABG’s and perform calculations </li></ul></ul></ul><ul><ul><ul><li>Monitor vital signs </li></ul></ul></ul><ul><ul><ul><li>Monitor SpO 2 </li></ul></ul></ul>
  3. 3. Chemical Analyzer measure O 2 percent <ul><li>Advantages </li></ul><ul><ul><li>Very precise </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Not safe in OR </li></ul></ul><ul><ul><li>Cumbersome to use </li></ul></ul>
  4. 4. Electrochemical O 2 Analyzers <ul><li>Galvanic Fuel Cell </li></ul><ul><li>Polarographic (Clark Electrode) </li></ul>
  5. 5. Galvanic Fuel Cell (Chemical Reaction) <ul><li>Two electrodes are contained in a potassium hydroxide bath </li></ul><ul><li>O 2 enters a Teflon semi permeable membrane and picks up electrons from the (–) gold cathode, combines with H 2 O, and travels to the (+) lead anode </li></ul><ul><li>The flow of electrons is proportional to the PP of O 2 </li></ul>
  6. 6. Polarographic Analyzer (Clark) <ul><li>Similar to the Galvanic Fuel Cell </li></ul><ul><li>but uses a 9-volt battery </li></ul><ul><li>A chemical reaction takes place </li></ul><ul><ul><li>O 2 enters through the teflon membrane and into a KCL bath </li></ul></ul><ul><ul><li>O 2 takes electrons from the (-) platinum cathode, combines with H 2 O and travels to the (+) silver anode </li></ul></ul><ul><ul><li>The flow of electrons is proportional to the PP of O 2 </li></ul></ul>
  7. 7. Galvanic vs. Polarographic <ul><li>Galvanic Fuel Cell </li></ul><ul><li>Advantages </li></ul><ul><ul><li>No batteries </li></ul></ul><ul><ul><li>Safe in OR </li></ul></ul><ul><ul><li>Makes own current </li></ul></ul><ul><li>Polarographic Electrode </li></ul><ul><li>Advantages </li></ul><ul><ul><li>Faster response time </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Consumes O2 </li></ul></ul><ul><ul><li>Accuracy affected by temp – increases </li></ul></ul><ul><ul><li>pressure – increases </li></ul></ul><ul><ul><li>humidity –decreases </li></ul></ul><ul><ul><li>altitude- decreases </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Consumes O2 faster </li></ul></ul><ul><ul><li>Accuracy affected by </li></ul></ul><ul><ul><li>temp – increases </li></ul></ul><ul><ul><li>pressure – increases </li></ul></ul><ul><ul><li>humidity –decreases </li></ul></ul><ul><ul><li>altitude- decreases </li></ul></ul>
  8. 8. Analyzer Calibration <ul><li>3 point calibration </li></ul><ul><ul><li>Expose analyzer to known FiO2 </li></ul></ul><ul><ul><li>100% 21% 100% </li></ul></ul><ul><li>2 point calibration </li></ul><ul><ul><li>15% 24% </li></ul></ul>
  9. 9. 3 point vs 2 point <ul><li>3 point calibration for wide range of FiO2 </li></ul><ul><ul><li>Typically 21%-100% applications in healthcare </li></ul></ul><ul><li>2 point calibration </li></ul><ul><ul><li>Narrower range of FiO2 encountered, (exercise testing) </li></ul></ul>
  10. 10. Mass Spectroscopy <ul><li>Gas molecules are ionized and separated via an electronic beam and are collected on plates according to the charge to mass ratio </li></ul><ul><li>Bulky & costly but accurate </li></ul>