Airway Collapsibility during Drug‐Induced Sleep Endoscopy Relates with Clinical Features of Obstructive Sleep Apnea

Abstract

IntroductionIncreased pharyngeal collapsibility leads to obstructive sleep apnea (OSA). Positive airway pressure titration during drug‐induced sleep endoscopy (DISE‐PAP) provides objective collapsibility metrics, the pharyngeal opening pressure (PhOP), and active pharyngeal critical pressure (PcritA). We examined the interrelationships between risk factors of OSA, airway collapsibility measures, and clinical manifestations of the disease.MethodsThis is a cross‐sectional analysis of consecutive OSA patients undergoing DISE‐PAP. Nasal PAP was increased stepwise until inspiratory flow limitation was abolished, signifying PhOP. PcritA was derived from the resulting titration pressure‐flow relationships. Clinical data including demographics, anthropometrics, sleep studies, and patient‐symptom questionnaires were obtained from the electronic medical record. Multivariate regression was used to evaluate the relationship between risk factors, airway collapsibility, and clinical data.ResultsOn average, the 164 patients meeting inclusion criteria were middle‐aged (54.2 ± 14.7 years), overweight/obese (BMI 29.9 ± 4.5 kg/m2), male (72.6%), White (79.3%) and had severe OSA (AHI 32.0 ± 20.5 events/hour). Mean PhOP was 7.5 ± 3.3 cm H2O and mean PcritA was 0.80 ± 3.70 cm H2O. Younger age (Standardized β = −0.191, p = 0.015) and higher BMI (Standardized β = 0.176, p = 0.028) were associated with higher PhOP, but not PcritA. PhOP and PcritA were both associated with AHI, supine AHI, and SpO2 nadir. Higher PhOP was associated with higher snoring scores (Standardized β = 0.246, p = 0.008), but not other patient‐reported outcomes.ConclusionObjective assessment of passive and active airway mechanics during DISE relates with clinical risk factors for OSA. Quantitative measures of collapsibility provide accessible and meaningful data, enhancing the standard sleep surgery evaluation.Level of Evidence4 Laryngoscope, 2023