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Treatment Principle(1)

OSA (Obstructive sleep apnea)
  • The main problem of OSA is upper airway collapse;
  • Common reaction of airway collapse : mouth breathing, snoring,  and apnea;
  • The basic function of CPAP machine is to ensure smooth flow of the airway;
  • The CPAP is able to provide Continuous Positive Airway Pressure through mask to patient, which can reach the ideal treatment affect.

Treatment Principle(2)

COPD
  • The main problem of COPD is increase resistance of the lower airway  (weak elasticity, inflammation,  narrow airway, etc.);
    Common reactions in patients: breathless, low tidal volume;
    The function of BIPAP  is to increase the tidal volume by the pressure support (IPAP  - EPAP);
    The BIPAP machine provides a suitable pressure support at the patient's mask end
  • Factors affecting tidal volume
  • Here we only talk about the effect of CPAP/BIPAP setting parameters on tidal volume, regardless of the actual condition of patients.
  • Pressure support: Pressure support is the main factor affecting tidal volume. The pressure support refers to the difference between the (IPAP) and (EPAP). The larger of difference value will have larger tidal volume. Note: IPAP does not determine the amount of tidal volume.
  • Inspirate trigger pressure rise faster will get more tidal volume.
  • Inspiratory duration: The longer of inspiratory duration will get more tidal volume
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