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. 2020 Dec 15;16(12):2021–2028. doi: 10.5664/jcsm.8736

Figure 2. Relationships measurement variables.

Figure 2

(A) Relationship of AHI and maximum negative pressure (Pmax) and cross-sectional area. Relationship of (A-a) AHI and Pmax; (A-b) AHI and minimum cross-sectional area (CSAmin); (A-c) Pmax and CSAmin; (A-d) pressure changes at NA and cross-sectional area at NA site; (A-e) pressure change at RA and cross-sectional area at RA site; and (A-f) pressure change at OA and cross-sectional area at OA site. (B) Association between enlargement of adenoids and the palatine tonsil (AT) and AHI, pressure change, airway volume of each site, and cross-sectional area (CSA) of each site. Each grade of AT did not correlate to the variables (AHI, negative pressure, airway volume, and CSA). Relationship of (B-a) AHI and Adenoid grade; (B-b) AHI and tonsil grade; (B-c) CSANA and Adenoid grade; (B-d) CSAOA and tonsil grade; (B-e) ΔNA and Adenoid grade; (B-f) ΔOA and tonsil grade; (B-g) NAv and Adenoid grade; and (B-h) relationship of OAv and tonsil grade. AHI = apnea-hypopnea index, CSA = cross-sectional area, CSAmin = minimum CSA, CSANA = CSA of NA, CSAOA = CSA of OA, CSARA = CSA of RA, NA = nasopharyngeal airway, Nav = NA volume, ΔNA = pressure changes in NA corresponding to adenoids, OA = oropharyngeal airway, OAv = OA volume, ΔOA = pressure changes in OA corresponding to tonsil, Pmax = maximum negative pressure, RA = retropalatal airway, ΔRA = pressure changes in RA where adenoids and palatine tonsil influence.