谷口 信行^{1, 3}, 都田 潤一郎², 伊東 紘一¹, 福井 順一¹, 中村 みちる¹, 鈴木 修¹

Nobuyuki TANIGUCHI^{1, 3}, Junichiro MIYAKODA², Kouichi ITOH¹, Junichi FUKUI¹, Michiru NAKAMURA¹, Osamu SUZUKI¹

¹自治医科大学　臨床病理学教室, ²国立米子病院, ³国保名和診療所

¹Department of Clinical Pathology, Jichi Medical School, ²Yonago National Hospital, ³Nawa Town Clinic

キーワード : Biometry, Diaphragm, Respiration, Thickness, Diagnostic ultrasound

We studied the structure and thickness of diaphragms by using an ultrasonic 7.5 MHz transducer. The diaphragms of healthy individuals and those with non-respiratory diseases had 5 layers: a pleural layer of high echo intensity, a muscle layer of low echo intensity, a connective tissue layer of high echo between two muscle layers, a muscle layer of low echo intensity, and a peritoneal layer of high echo intensity. Diaphragm thickness in the supine position was 2.0±0.5 mm (mean±SD, n=62) at resting exspiratory position, 4.3±1.1 mm (n=61) at maximal inspiratory position, and 1.8±0.4 mm (n=61) at maximal expiratory position. Values obtained from these three levels differed significantly from one another. Diaphragm thickness at resting expiratory position correlated with body weight and body height, but not with age.