Nasal Obstruction as a Potential Factor Contributing to Hypoxemia in Obstructive Sleep Apnea

Area of Science:

• Respiratory Medicine
• Sleep Medicine
• Otolaryngology

Background:

• Obstructive sleep apnea (OSA) is a complex condition with multifactorial pathophysiology.
• The contribution of upper airway resistance, particularly nasal obstruction, to OSA severity requires further elucidation.

Purpose of the Study:

• To investigate the correlation between nasal resistance and oxygen desaturation in OSA patients.
• To clarify the role of nasal obstruction in the development of hypoxemia during sleep.

Main Methods:

• Eighty-eight OSA patients underwent nasal resistance measurements in seated and supine positions at varying pressures (75, 150, 300 Pa).
• Oximetric variables, including oxygen desaturation index (ODI) and time with oxygen saturation < 90% (T < 90%), were analyzed.
• Correlations between nasal resistance and oximetric data were assessed, with subgroup analysis for OSA severity.

Main Results:

• Nasal resistance significantly increased in the supine position at 75 and 150 Pa.
• Supine nasal resistance at 75 Pa positively correlated with ODI and T < 90% (p<0.05).
• These correlations were significant in moderate to severe OSA; BMI and supine nasal resistance predicted increased ODI.

Conclusions:

• Nasal resistance in the supine position at 75 Pa is a significant predictor of oxygen desaturation severity in OSA.
• Nasal obstruction is implicated in the pathophysiology of hypoxemia in OSA, particularly in moderate to severe cases.