A Method for Estimating Tidal Volume from Multi-Lead Electrocardiograms.
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概要
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The purpose of this study is to estimate tidal volume from mluti-lead electrocardiograms without devices such as a nose clip or a face mask. The estimating method proposed in this study assumes that the direction of the vector loop (DVL) determined by the orthogonal leads represents the change in lung volume. DVL is defined as the diagonal direction of the rectangle which circumscribes the QRS vector loop. Another estimating method using the direction of the mean electrical axis (DMA) is compared with the method using DVL. The standard lead electrocardiograms and the change in lung volume are measured in our experiment. The change in lung volume is obtained by electrical integration of respiratory flow. During measurement subjects (aged 22 to 44 years, 15 males and 1 female) are instructed to change their tidal volume (ranging from 0.2 to 2.0l) voluntarily. Correlation coefficients between tidal volume and the changes in DVL and DMA are calculated to evaluate the two methods. The correlation coefficients obtained from DVL range from 0.61 to 0.96 (mean=0.86), while those obtained from DMA range from 0.22 to 0.90 (mean=0.60). In 11 subjects, the correlation coefficients obtained from DVL are significantly larger than those obtained from DMA. These results indicate that the change in DVL is closely correlated with tidal volume and reflects tidal volume more accurately, and that the estimating method proposed in this study can be used for respiratory monitoring.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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