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SLEEP APNEA01..

  • DEFNITION OF SLEEP APNEA
  • HISTORY OF SLEEP APNEA
  • TERMS USED
  • PATHOGENESIS
  • PREDISPOSING FACTORS
  • TYPES OF APNEA
  • DIAGNOSIS-EXAMINATION &INVESTIGATIONS
  • TREATMENT MODALITIES
  • CONCLUSION
  • PATHOGENESIS
  • During inspiration  a negative intrapharyngeal pressure develops but airway collapse is prevented by  the action of the pharyngeal abductor and dilator muscles. These muscles are  activated rhythmically during daytime respiration but, they become hypotonic  during sleep, and airway stability becomes dependent upon pharyngeal size and pharyngeal tissue compliance. Apnea occurs when the throat muscles and tongue  relax during sleep and partially block the opening of the airway. As yet, little is known about the compliance of the pharyngeal tissues. However, conditions that reduce airway dimensions result in OSA.

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