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- W2414284191 abstract "Induction plethysmography (IP) utilizes changes in the inductance of sinusoidal wires embedded in elastic bands placed around the chest and abdomen to detect volume changes in the two compartments. These changes can be attributed to respiration or heart beat. To date, most applications have been tailored to an investigation of respiration. More sensitive systems have been employed for the detection of cardiac activity. The wires within the bands, which function as the coil in a resonant circuit, are excited by an oscillator. Among other factors, the inductance of the coil depends on the cross-sectional area of the coie, and changes with respiration in coils placed around the chest and abdomen. Using LabView software, the biosignals obtained undergo an analog-to-digital conversion prior to processing. The system was calibrated using the isovolume method. In 10 adults, IP was tested against a pneumotachograph (PNT) in different body positions (standing, sitting, supine, prone). Correlation between tidal volumes measured with IP and PNT was of r > or = 0.96 on average, recalibration being done after each change in position. The absolute mean error ranged between 3.7 and 8.5%, depending on body position. The smallest error (3.7%) and greatest agreement between the two methods was found in the supine position (93.3% of the IP measurements within +/- 10% of the PNT measurements). An IP application that could be used to collect data over the long term and which is in good agreement with PNT was developed by employing a virtual instrument (VI, LabView) for flexible data acquisition and data processing. Agreement was best when the volunteer adopted a supine position. A smaller correlation was found in standing or seated subjects. This might be due to the fact that in the latter two positions, the respiratory system may have more than 2 degrees of freedom, and thus cannot be adequately monitored by only two bands around the thorax and abdomen. Signals produced by cardiac activity were detectable on the surface of the body." @default.
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- W2414284191 date "2002-01-01" @default.
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- W2414284191 title "Entwicklung eines flexiblen kardio-respiratorischen Monitors auf Basis der Induktionsplethysmographie. Development of a Flexible Cardio-respiratory Monitor Based on Induction Plethysmography" @default.
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- W2414284191 doi "https://doi.org/10.1515/bmte.2002.47.7-8.178" @default.
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