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Table 4 Upper airway CT results of responders (n = 9) (mm2)

From: Efficacy and mechanism of mandibular advancement devices for persistent sleep apnea after surgery: a prospective study

Respiratory status Parameters Plane Before MAD After MAD P value
Quiet breathing CSA NP 131.0 ± 115.4 185.3 ± 100.5 0.052
VP 26.8 ± 19.0 46.4 ± 26.4 0.023
GP 103.8 ± 66.9 93.9 ± 50.8 0.533
EP 52.0 ± 26.5 38.5 ± 22.1 0.068
A-P diameter NP 7.7 ± 4.6 9.3 ± 3.5 0.125
VP 2.8 ± 1.6 3.6 ± 1.6 0.181
GP 14.6 ± 5.5 13.9 ± 4.5 0.966
EP 6.6 ± 2.7 5.5 ± 1.7 0.202
Lateral diameter NP 11.8 ± 6.6 16.5 ± 5.1 0.045
VP 9.7 ± 6.3 12.4 ± 4.7 0.008
GP 14.6 ± 5.5 13.9 ± 4.5 0.497
EP 15.1 ± 15.2 8.5 ± 4.2 0.236
Deep inspiration CSA NP 197.3 ± 173.9 205.7 ± 183.1 0.375
VP 18.3 ± 16.3 43.0 ± 37.8 0.186
GP 131.0 ± 3.6 356.0 ± 189.1 0.172
EP 39.3 ± 27.4 83.0 ± 37.4 0.195
A-P diameter NP 9.3 ± 8.1 9.8 ± 8.7 0.423
VP 1.7 ± 2.0 2.4 ± 2.2 0.277
GP 8.1 ± 1.4 13.8 ± 7.9 0.264
EP 5.4 ± 1.0 8.9 ± 1.7 0.145
Lateral diameter NP 14.6 ± 12.9 15.1 ± 13.6 0.580
VP 6.7 ± 7.7 11.6 ± 10.7 0.199
GP 19.0 ± 2.5 28.5 ± 7.4 0.197
EP 9.1 ± 7.3 10.6 ± 5.9 0.537
Sleep apnea /hypopnea CSA NP 133.8 ± 109.3 163.9 ± 94.5 0.082
VP 5.0 ± 6.4 21.2 ± 10.5 0.000
GP 77.0 ± 68.6 86.0 ± 51.3 0.684
EP 87.4 ± 84.5 66.4 ± 50.4 0.533
A-A-P diameter NP 7.1 ± 4.6 8.7 ± 3.7 0.171
VP 1.3 ± 1.2 2.9 ± 0.9 0.001
GP 8.9 ± 6.8 9.3 ± 4.5 0.813
EP 10.2 ± 6.7 8.5 ± 4.1 0.442
Lateral diameter NP 12.0 ± 6.7 15.7 ± 6.1 0.080
VP 2.2 ± 2.3 8.2 ± 3.8 0.001
GP 9.6 ± 7.8 11.5 ± 4.4 0.427
EP 9.4 ± 6.9 9.3 ± 5.2 0.985
  1. Abbreviations: CSA cross-sectional area, A-P anterior-posterior diameter, NP nasopharynx, VP velopharynx,GP glossopharynx, EP epiglopharynx