呼吸による横隔膜位置と胸腹2点式呼吸モニタリング装置の指示値との相関性の検証

概要

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[Purpose] We investigated the correlation between diaphragm motion evaluated using fluoroscopy and a respiratory monitoring device(Abches: APEX Medical, Inc, Tokyo), which comprised two arms for measuring changes in the levels of the chest and abdominal walls. [Method] Fluoroscopic abdominal sequences(512×512 matrix, 5.36 f/s)during normal and forced breathing were taken from five healthy men aged 22-23 years. Simultaneously, a video of the respiratory indicator(Abches)was recorded(720×480 matrix, 30f/s). Diaphragm positions in the fluoroscopic sequences were measured and the indicator values were read from the videos. [Result] During normal respiration there was a linear relationship between the indicator values and diaphragm positions measured using fluoroscopy. The coefficients of correlation ranged from 0.958 to 0.985. During forced respiration the correlation of these values was quadric(r=0.919 to 0.996). Hysteresis in the relationship between these motions was observed in two of the five cases. [Conclusion] In normal breathing, we found that the correlation between fluoroscopic and respiratory indicator measurements had linearity. In forced breathing, the correlation was quadric, and phase shifting between diaphragm motion and respiratory indicator measurements was observed in two of the five cases.