BackgroundModerate to severe obstructive sleep apnea (OSA) is associated with cardiovascular disease. Polysomnography is time intensive and difficult to access for diagnosis of OSA. Neck computed tomography (CT) provides upper airway delineation but not diagnostic criteria for moderate to severe OSA. We explored neck CT with computational fluid dynamics (CFD) study for airway pressure and airflow velocity to predict moderate to severe OSA.MethodsEnrolled from February 1, 2020, to June 30, 2021, patients with OSA with overnight oxygen desaturation (sPO2 <90%) received awake neck CT with a CFD study of their airway pressure and airflow velocity. CTL12 and CTL34 were defined as airflow velocity <3 and ≥3 m/s, respectively, and airway pressure <10 and ≥10 pa, respectively, in the narrowest upper airway.ResultsSixty-two patients (42 male and 20 female; mean age: 50.4 ± 14.6 years) were included; 12 and 50 patients had mild OSA and moderate to severe OSA, respectively. The minimum sPO2 in the supine position was 80.7 ± 9.1%. The total time of sPO2 <90% at overnight oximetry was 29.3 ± 51.1 min. Most (85.5%) neck CT examinations with CFD study presented CTL34. Patients with CTL34 had a lower minimum sPO2 in the supine position (78.4 vs. 88.1%, P = 0.004) and longer duration of sPO2 <90% at overnight oximetry (33.9 vs. 1.9 min, P = 0.001) than those with CTL12. The values of the area under the receiver operating characteristic curves of airway pressure and of airflow velocity at the narrowest upper airway were 0.788 and 0.733, respectively.ConclusionNeck CT with CFD study of airway pressure and airflow velocity may provide a quick prediction of moderate to severe OSA.
In order to determine the diagnostic value of CT in pelvic trauma, esp. acetabular fracture, we analysed 32 cases of pelvic trauma with conventional radiographic and computed tomographic findingsThe results were as follows'1. There were 26 males and 6 female and peak age span was 4th decade.2. In 32 cases of acetabular fractures, single column fracture were diagnosed in 20 cases and two column fracture in 12 cases by CT. Among single column fractures, anterior column fractures were 12 cases and posterior column fractures were 8 cases. Complex fracture was most common type in two column fractures.3. In 32 cases of acetabular fractures diagnosed by CT, 18 cases could be detected by plain X'ray.4. lntraarticular bony fragments were detected on CT in 11 cases and on plain X'ray in 2 cases. 5. Combined soft tissue injuries were 13 cases of pelvic hematoma, 1 case of retroperitoneal hematoma and 2 cases of hemarthrosis 6. CT was useful in acetabular i 미 ury to delineate the extent and type of fracture, localize intrarticular bony fragments, characterize joint dislocation and detect the combined soft tissue i 미 ury .
The indication 01 co ll1 puted tO ll1 ography lor the breast lesions are 1) Unusually extensive or sll1all breast caused techn ica l dilliculties in performing mammograms 2) Q uestionable ll1 ammographic findings, esp ecially in dense pro liferative breast parenchyll1 e -954 -
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