Understanding Correlation of Polysomnography Parameters with Drug Induced Sleep Endoscopy in Obstructive Sleep Apnea

The aim of this study was to analyze drug-induced sleep endoscopy (DISE) findings performed in 64 patients and to evaluate the association of DISE findings with PSG parameters. This retrospective, single center, observational study included patients with obstructive sleep apnoea (OSA) who have undergone DISE as part of surgical planning. DISE was performed using dexmedetomidine infusion. The data were documented as per VOTE (velum, oropharynx, tongue base and epiglottis) classification. The patient characteristics and level 2 Polysomnography (PSG) findings were analyzed with DISE findings. Among 62 patients, mean AHI and lowest oxygen saturation levels were 39.68 ± 27.59 and 78.36 ± 9.38, respectively. Mean ESS, SSS and PSQI levels were 10.74 ±  - 4.96, 7.73 ±  - 1.52, and 8.92 +/- 4.99, respectively. A Single level of obstruction was observed in 4.8% patients, followed by 40.3%, 43.5%, and 11.3% were found to have 2, 3, and 4 levels of obstruction, respectively. All patients had palatal involvement, followed by the oropharyngeal (88.7%), the tongue base (59.7%), and the epiglottis (12.9%) obstruction. There was no significant correlation between partial collapse at velopharynx with AHI. However, complete collapse at the level of the oropharynx (p < 0.05) and the tongue base (p < 0.001) showed a statistically significant association with AHI. Also, a significant correlation was observed between the number of sites and AHI Grade (p < 0.0001). The study helps to understand the association of different patterns and degrees of anatomical obstruction in OSA with different PSG parameters. PSG and DISE findings are complimentary to each other in treatment planning and selection of surgical procedures.