Ambulation Analysis in Wearable ECG by Subhasis Chaudhuri

By Subhasis Chaudhuri

Ambulation research in Wearable ECG

Subhasis Chaudhuri, Tanmay Pawar, Siddhartha Duttagupta

Ambulation research in Wearable ECG demonstrates why, because of contemporary advancements, the wearable ECG recorder substantiates an important innovation within the healthcare field.

About this book:

Examines the viability of wearable ECG in cardiac monitoring

Includes chapters written by means of practitioners who've individually built such to jot down in regards to the details

Bridges the space among and algorithmic advancements with chapters that in particular talk about the points and their corresponding calibration issues

Presents an invaluable textual content for either practitioners and researchers in biomedical engineering and similar interdisciplinary fields

Assumes easy familiarity with electronic sign processing and linear algebra

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Extra info for Ambulation Analysis in Wearable ECG

Example text

3, constitutes three operational amplifiers and seven resistors comprising three matched pairs and one single resistor R1. Direct connection of input differential voltage to the opamp terminals provides an effective high input impedance for INA. Therefore loading of INA on the sensor will be almost negligible. However sometimes bias resistors at the input of INA are provided to establish a DC bias voltage at the input of INA. g. 2MΩ. Fig. 3. Three-opamp configuration for INA implementation. 32 3 Hardware Development of Wearable ECG Devices It is straightforward to derive the input-output characteristics of the INA, shown in Fig.

Are presented in [5]. This kind of estimation of the cardiac cycle requires correct alignment of corresponding cardiac features like P, QRS and T waves in the ECG beats. There are various methods for alignment of ECG beats in the literature namely, the double level method, normalized integral method and matched filtering method, etc. These techniques are reviewed in [56, 58]. In the double level method, crossings of a fixed threshold level by the signal in upward and downward directions are measured as time t1 and t2 , respectively.

4 Noise Reduction in ECG It has been noted previously that noise from various sources like muscular activities, 50/60Hz powerline, skin stretching and electrode motion, movement of heart due to respiration, etc. can contaminate the ECG signal and hence affect the interpretation of ECG signal. In particular, an automated analysis requires noise free ECG signal for correct interpretation. However, it is difficult to control the environment and prevent the interference due to some physiological events like breathing.

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