By Subhasis Chaudhuri
Ambulation research in Wearable ECG
Subhasis Chaudhuri, Tanmay Pawar, Siddhartha Duttagupta
Ambulation research in Wearable ECG demonstrates why, because of fresh 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 through practitioners who've in my opinion constructed such to jot down concerning the details
Bridges the distance among and algorithmic advancements with chapters that in particular speak about the elements and their corresponding calibration issues
Presents an invaluable textual content for either practitioners and researchers in biomedical engineering and comparable interdisciplinary fields
Assumes uncomplicated familiarity with electronic sign processing and linear algebra
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Additional resources for Ambulation Analysis in Wearable ECG
The powerline interference appears as the common mode signal to the ECG amplifier and available from the right leg electrode. Hence the signal from the right leg electrode is used as the reference input signal to the adaptive filter for cancellation of powerline noise. Here it should be noted that in many places the powerline frequency may often deviate from the specified value (either 50 or 60Hz) in the range of ±2Hz. In this case, the adaptive filtering technique can be more effective . Moreover, it has been shown in , the adaptive implementation introduces less noise in measurement of the ST segment in comparison to that by a non-adaptive notch filter.
The EMG signal seen on the skin surface is quite localized in nature. Due to this property, the EMG interference in different ECG leads may be uncorrelated because the different leads are placed at different locations on the body. With this rationale an adaptive filtering technique has been proposed in . It suggests that for removal of the EMG from one particular lead of the ECG signal which acts as the primary input, the signals from the orthogonal ECG leads can be used as the reference input of the adaptive filter.
If all components between the body and input terminals of the instrumentation amplifier are matched still CMRR of the signal conditioner module is a finite value and hence a small portion of the induced common mode signal appears as 50Hz (or 60Hz) noise in the recorded ECG. This noise disturbs the ECG, specifically P-Wave and T-Wave part of it. Using a sharp notch filter with center frequency of 50Hz (or 60Hz) seems to be a solution for reducing the interference. However care should be taken to avoid ECG distortion.
Ambulation Analysis in Wearable ECG by Subhasis Chaudhuri