Monitoring of breathing pattern at rest by electrical impedance tomography

被引:12
作者
Balleza, Marco
Fornos, Jaume
Calaf, Nuria
Feixas, Teresa
Gonzalez, Mercedes
Anton, Daniel
Riu, Pere
Casan, Pere
机构
[1] Univ Autonoma Barcelona, Unitat Funcio Pulmonar, Fac Med, Hosp Santa Creu & Sant Pau, Barcelona 08025, Spain
[2] Univ Politecn Catalunya, Dept Elect Engn, Barcelona, Spain
来源
ARCHIVOS DE BRONCONEUMOLOGIA | 2007年 / 43卷 / 06期
关键词
electrical impedance tomography; breathing pattern; pneumotachometer;
D O I
10.1157/13106559
中图分类号
R56 [呼吸系及胸部疾病];
学科分类号
摘要
OBJECTIVE: Electrical impedance tomography (EIT) involves the application of a small alternating current to produce a series of chest images that can be used to monitor breathing pattern. The relation between chest images and tidal volume has not been sufficiently validated. The aim of the present study was to analyze the correlation between EIT images and the volume-time signal measured with a pneumotachometer in 13 healthy volunteers. MATERIAL AND METHODS: The following measurement devices were used: a) MedGraphics; preVent(TM) Pneumotach, with special software for recording the volume-time signal (reference test), and b) EIT-4, a fourth-generation prototype unit designed by the Department of Electronic Engineering at the Universidad Politecnica de Cataluna, Spain that records the volume-time signal and produces a graphic depiction of a cross section of the thorax at the sixth intercostal space. RESULTS: The mean (SD) tidal volume measured by the pneumotachometer and the EIT-4 was 0.523 (0.102) L and 0.527 (0.106) L, respectively (P value not significant). The linear correlation coefficient between the 2 measurements was 0.923 (P = .001), and the mean of the differences between the 2 procedures was -0.003 L (95% confidence interval, -0.045 to 0.038). The greatest differences were associated with female gender, body mass index, and chest circumference. In view of these differences, a different equation based on these variables was needed for calibration of the EIT-4. CONCLUSIONS: The EIT-4 provides an alternative means of monitoring breathing pattern, although a number of issues related to the circumference of the rib cage need to be resolved.
引用
收藏
页码:300 / 303
页数:4
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