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Thermistor

Learn about the role of thermistors and nasal cannulae in measuring airflow temperatures, their sensitivity to detecting hypopnea, and their limitations in sleep apnea detection. Explore various sensors used, such as inductive plethysmography and piezo sensors, for qualitative and quantitative analyses. Discover how different sensors provide diverse information in diagnosing sleep disorders.

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Thermistor

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  1. Thermistor • Qualitative signal • Measurement of the temperature of inspired and expired airflow • No linear correlation with ventilation • Unreliable for hypopnea detection

  2. Nasal cannula • Curvilinear relationship between pressure and flow • Good sensitivity to detect hypopnea and flow limitation • Mouth opening reduces performance

  3. Measuring oronasal airflow Thermistors : monitor temperature, not flow • Nasal cannulae : • P~ V²

  4. Inductive Plethysmography Quantitative: requires titration, can’t last overnight Semi-quantitative: reliable for clinical use

  5. Piezo sensors and strain gauges Qualitative In hypopnea detection should be linked to other signals To be placed where maximal excursion of thorax and abdomen are detected

  6. Continuous Snoring Intermittent Snoring

  7. Hernandez, L. et al. Chest 2001;119:442-450

  8. Nasal cannula Normal flow Cardiogenic oscillations (central apnea) Flow limitation Mouth opening

  9. Thoraco-abdominal Movements Paradoxical Movements Movements in phase

  10. EEG O1A2 EEG C3A2 EOG sx EOG dx EMG ECG flow thorax abd. SaO2

  11. Hypopnea

  12. Different sensors give different information Hernandez, L. et al. Chest 2001;119:442-450

  13. RERA Flow limitation

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