الفهرس 
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Abstract
Background: chronic sinusitis is one of the most prevalent chronic illnesses, affecting persons of all age groups. It is an inflammatory process that involves the paranasal sinuses and persists for 12 weeks or longer(4).
Purpose: To investigate the effect of chronic rhinosinusitis (CRS) on sleep disordered breathing.
Patients and Methods: This study was conducted prospectively during the period from June 2017 till June 2018 on one hundred patients with chronic rhinosinusitis attended to ENT departments of El-Maadi Armed Forces Medical Complex, Kobry El-Kobba Armed Forces Medical Complex and El-Demerdash Hospitals. Additional 10 control patients were included in the study. All the patients gave informed consent to participate in this study.
Results: The A group showed marked decrease in sleep efficiency and basal Spo2; compared to B group; but also showed significant post-operative increase in sleep efficiency and basal Spo2 level during the serial 1st and 2nd measurements.
The A group showed marked increase in snore index and snore episodic ; compared to B group; but also showed significant post-operative decrease in snore index and snore episodic level during the serial 1st and 2nd measurements.
Comparative study between pre and post-operative measurements revealed; non-significant difference regarding (A+H) index.
Conclusion: Surgery decreased snoring and ESS scores, increased sleep efficiency, minimal and basal Spo2 measurements without changes in the apnea-hypopnea index and improved sleep quality.