Electrical impedance plethysmography technique in estimating pulmonary function status

Abstract

An attempt has been made to study the appropriateness of electrical impedance plethysmography (EIP) in detecting pulmonary health status. A feasibility study was conducted on normal, obstructive and restrictive subjects aged between 20 and 60 years. Quantitative assessment of pulmonary function was made by way of both EIP and pulmonary function tests (PFT). Amongst the various EIP parameters, a statistically significant difference was observed for the respiratory band power, between normal (129.7) and obstructive (35.8) subjects, indicating that this EIP variable can be used to distinguish between the two pulmonary function states. A significant positive correlation was observed between a spirometry parameter, peak expiratory flow rate (PEFR), and an EIP parameter, respiratory amplitude (r = 0.372, p < 0.05), thereby indicating that EIP information by way of respiratory amplitude is comparable to that provided by PEFR. Hence, both respiratory amplitude and respiratory band power were seen to provide useful information on pulmonary health status.

E-textiles in Clinical Rehabilitation: A Scoping Review

“…These estimates can be useful for body composition analysis [65], assessing pulmonary function [66], and monitoring nutritional status of patients undergoing hemodialysis [67,68], among other applications.…”

Development and Evaluation of an Improved Technique for Pulmonary Function Testing Using Electrical Impedance Pneumography Intended for the Diagnosis of Chronic Obstructive Pulmonary Disease Patients

“…Unlike spirometry, the IPFS determined the signal flow from the volume. Previous studies on detecting respiration changes using the impedance method [6,15] did not report the parameters used for the assessment of lung function because impedance signals involving respiration had limited resolution. In addition, the attachment of electrodes to the chest inconveniences the patient.…”

“…A pulmonary function test (PFT) is useful for the diagnosis, assessment, and management of COPD and other respiratory diseases [5]. For example, in patients already suffering from COPD, regular PFTs can be used to determine whether the condition is worsening [6,7]. …”

“…Seppa et al investigated the use of EIP for monitoring pulmonary flow and volume signals instead of only the respiration rate or tidal volume [15]. Agarwal et al compared the lung functions of normal, obstructive, and restrictive subject groups by analyzing the frequencies of EIP signals [6]. However, both of these studies could not realize the direct determination of lung function assessment parameters because the impedance signals had limited resolution.…”

A convenient pulmonary volume and flow detection system

“…Goldensohn and Zablow [5] reported the relationship between the respired volume measured by spirometry and the corresponding changes in impedance measured on each arm above the wrist. Agarwal et al [6] applied frequency analysis to the EIP signal and compared it to PFT parameters; however, they did not calculate PFT directly from the EIP signal. Current studies provide the tidal volume and respiration rate, but thus far, no previous investigations have estimated PFT parameters FVC, FEV 1 , FEV 1 /FVC ratio, and PEF using the impedance method.…”