Measurement of Tidal Volume during High Frequency Ventilation by Impedance Plethysmography

Abstract

ABSTRACT: Electrical impedance plethysmography was evaluated in lambs as a method of measuring tidal volume (VT). Over tidal volumes ranging from 15 to 414% of estimated dead space, and frequencies of 300 to 1000 breaths/min, correlation between VT measured by the impedance technique and VT measured by whole-body plethysmography was 0.98. Above 600 breaths/min, the correlation between the two methods was 0.94. Independent calibration of the impedance technique using a pneumotachograph at conventional rates of ventilation yielded absolute values of VT which closely corresponded to values obtained with the whole-body plethysmograph (slope = 1.05, intercept = 1.4 ml, r = 0.99). These results support the potential utility of impedance plethysmography in clinical applications of high frequency ventilation.

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Correspondence to Robert B Cotton.

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Sandberg, K., Lindstrom, D., Krueger, E. et al. Measurement of Tidal Volume during High Frequency Ventilation by Impedance Plethysmography. Pediatr Res 23, 253–256 (1988). https://doi.org/10.1203/00006450-198803000-00003

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