Faculty Collaboration Database

Measurement of ventilation using digitally filtered transthoracic impedance. J Appl Physiol Respir Environ Exerc Physiol 1983 Apr;54(4):1161-6

Date

04/01/1983

Pubmed ID

6406408

DOI

10.1152/jappl.1983.54.4.1161

Scopus ID

2-s2.0-0020639083 (requires institutional sign-in at Scopus site)   6 Citations

Abstract

A seven-stage low-pass digital filter was used to remove the cardiac artifact and motion interference from a respiratory transthoracic impedance signal in human subjects. After removal of these artifacts, the mean difference from a conventional gasometer technique fell from 5% to 1.6%. When the impedance technique was used to measure ventilation during air breathing, the addition of a breathing valve with a mouthpiece and noseclip induced the following changes in ventilatory parameters: 7% drop in frequency, 24% increase in tidal volume, 49% increase in inspiratory time, 56% increase in expiratory time, 10% decrease in inspiratory flow rate, and 4% decrease in ratio of respiratory time to total breath duration. These alterations were not significant at elevated inspired CO2 levels. The digitally filtered transthoracic impedance technique provides an accurate technique for measuring ventilatory parameters without the perturbations induced by using a conventional breathing valve technique even when cardiac and motion artifacts were prominent.

Author List

Newton PE, Hamilton LH, Forster HV

Author

Hubert V. Forster PhD Professor in the Physiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adult
Carbon Dioxide
Electric Conductivity
Humans
Male
Physiology
Respiration
Thorax