Postoperative functional evaluation of obstructive sleep apnea syndrome by computational fluid dynamics

Area of Science:

• Otolaryngology
• Respiratory Medicine
• Biomedical Engineering

Background:

• Obstructive sleep apnea syndrome (OSAS) significantly impacts patient health, often necessitating surgical intervention.
• Uvulopalatopharyngoplasty (UPPP) is a common surgical procedure for OSAS, but its efficacy and impact on airflow require detailed evaluation.
• Patient-reported symptoms like snoring and apnea are key indicators for OSAS diagnosis and treatment selection.

Purpose of the Study:

• To assess the effectiveness of uvulopalatopharyngoplasty (UPPP) in treating obstructive sleep apnea syndrome (OSAS).
• To analyze the changes in postoperative airflow patterns using computational fluid dynamics (CFD).
• To explore the correlation between airflow dynamics and the respiratory event index (REI) score.

Main Methods:

• Eleven patients diagnosed with OSAS underwent UPPP surgery.
• Computational fluid dynamics (CFD) was employed to analyze airflow dynamics before and after surgery in nine patients.
• Airflow velocity and pressure were measured and analyzed in the oropharynx and epiglottic regions.

Main Results:

• Preoperative identification of stenosis in the oropharynx and epiglottic areas.
• Postoperative airflow velocity and pressure significantly decreased in the oropharynx, while some cases showed increased values in the epiglottic area.
• Oropharyngeal airflow velocity and pressure were found to be related to the respiratory event index (REI) score.

Conclusions:

• CFD analysis provides crucial insights into airflow dynamics for evaluating the severity of sleep apnea.
• Airflow analysis is vital for understanding the functional outcomes of UPPP surgery.
• The study suggests the potential for preoperative prediction of postoperative functional outcomes using CFD.