Optimization of the Position of Single-Lead Wireless Sensor with Low Electrodes Separation Distance for ECG-Derived Respiration

Helena Svobodova,Erik Vavrinsky,Daniela Turonova,Martin Kopani,Martin Donoval,Martin Daricek,Peter Telek

doi:10.15598/aeee.v16i4.2773

Abstract

A classical method for estimation of respiratory information from electrocardiogram (ECG), called ECG - derived respiration (EDR), is using flexible electrodes located at standard electrocardiography positions. This work introduces an alternative approach suitable for miniaturized sensors with low inter-electrode separation and electrodes fixed to the sensor encapsulation. Application of amplitude EDR algorithm on single-lead wireless sensor system with optimized electrode positions shows results comparable with standard robust systems. The modified method can be applied in daily physiological monitoring, in sleep studies or implemented in smart clothes when standard respiration techniques are not suitable.

Highlights

Produced and commercially used medical, psychophysiological or intended devices for sport activ-Several methods were proposed to derive the respiratory signal from the ECG using beat-to-beat morphologic variations
We demonstrated application and optimization of the amplitude ECG-derived algorithm for estimation of respiratory frequency using a single-lead wireless sensor with constant electrode separation of 2 cm
Since the electrode separation is comparable with the heart displacement due to motion of thoracic diaphragm, the electrode position is crucial for the reliable ECG - Derived Respiration (EDR) measurement

Summary

Introduction

Several methods were proposed to derive the respiratory signal from the ECG using beat-to-beat morphologic variations. ECG-derived respiration method we have used, is evolved from chest movements and changes of the impedance distribution in human thorax that affects the amplitude of the QRS complex during the respiratory cycle [7] and [18]. We used this method derive EDR from the magnitude of QRS complex for our holter device. Breathing causes a rotation of the electrical axis of the heart which affects the c 2018 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING beat morphology. Male and female probands commonly use different style of respiration. -called abdominal breathing is dominant; for female probands a costal respiration is typical [20] and [21]

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