Relationship Between Airway Measurements and OSAS

Clinical EvaluationSleep EvaluationAirway EvaluationSourceLevelNo.Findings
Standardized history, clinical examinationPSGLateral neck radiographyXu et al256IV50Combinations of different predictor variables resulted in positive and negative predictor values ranging from 70% to 80%
Clinical examinationPSGLateral neck radiographyJain and Sahni257IV40Degree of OSAS correlated with adenoid size on radiography but not with tonsillar size on clinical examination
Clinical examinationPSGLateral neck radiographyLi et al258IV35Tonsillar–pharyngeal ratio on radiography correlated with AHI but not clinical tonsil size. Clinical tonsil size did not correlate with AHI
For a ratio of 0.479, the sensitivity and specificity in predicting moderately severe OSAS (AHI >10/h) was 96% and 82%, respectively
NAPSGCephalometryKawashima et al259III15 OSASEvidence of retrognathia in OSAS group
30 controls
Clinical examinationAmbulatory abbreviated recordingsCephalometryKawashima et al260III38 OSASOSAS: retrognathia, long facies in those OSAS subjects who had large tonsils
31 controls
NANoneCephalometryKikuchi et al261IV29 suspected OSASOSAS: long facies
41 controls
QuestionnaireNoneCephalometryKulnis et al262IV28 snorersSnorers: retrognathia, shorter maxilla and cranial base
28 controls
Standardized historyNap PSGCephalometryZucconi et al263III26 snorersSnorers: retrognathia, decreased nasopharyngeal space
26 controls
NAPSGMRISchiffman et al89III24 OSASNo difference in mandibular size between OSAS and controls
24 controls
Clinical assessment of tonsillar sizeAmbulatory cardiorespiratory recordingsAcoustic pharyngometryMonahan et al90I203Degree of OSAS correlated with airway size on pharyngometry but not with tonsillar size
CephalometryPharyngometric measures also correlated with mandibular length on cephalometry, only 78% of 8- to 11-y-old children could produce minimally acceptable data, and only 54% could produce high-quality data
Questionnaire, clinical examinationPSGRhinometryRizzi et al91IV73Nasal resistance of 0.59 Pa/cm3/s had a positive predictive value of 97% and a negative predictive value of 86%