Abstract
Controversial reports concerning theory and use of impedance pneumography necessitated clinical evaluation of the technique. Recorded data from nine control subjects, 12 patients during surgical anesthesia, and seven patients during recovery from surgery form the basis of the study. Useful correlation (mean r=0.89) was obtained between impedance waveform amplitude and tidal volume during surgical anesthesia. Control correlation was about the same (mean r=0.87). Artifacts were easily recognized and not a problem. Intentional complete airway obstruction was easily detected by this noninvasive method. The monitoring equipment was easy to use, electrically safe, and the ability to obtain the ECG from the same electrodes make it especially useful during surgical anesthesia and in the recovery room.
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