Analysis of gastric myoelectrical activity from the electrogastrogram signals based on wavelet transform and line length feature

Electrogastrogram is used for the abdominal surface measurement of the gastric electrical activity of the human stomach. The electrogastrogram technique has significant value as a clinical tool because careful electrogastrogram signal recordings and analyses play a major role in determining the propagation and coordination of gastric myoelectric abnormalities. The aim of this article is to evaluate electrogastrogram features calculated by line length features based on the discrete wavelet transform method to differentiate healthy control subjects from patients with functional dyspepsia and diabetic gastroparesis. For this analysis, the discrete wavelet transform method was used to extract electrogastrogram signal characteristics. Next, line length features were calculated for each sub-signal, which reflect the waveform dimensionality variations and represent a measure of sensitivity to differences in signal amplitude and frequency. The analysis was carried out using a statistical analysis of variance test. The results obtained from the line length analysis of the electrogastrogram signal prove that there are significant differences among the functional dyspepsia, diabetic gastroparesis, and control groups. The electrogastrogram signals of the control subjects had a significantly higher line length than those of the functional dyspepsia and diabetic gastroparesis patients. In conclusion, this article provides new methods with increased accuracy obtained from electrogastrogram signal analysis. The electrogastrography is an effective and non-stationary method to differentiate diabetic gastroparesis and functional dyspepsia patients from the control group. The proposed method can be considered a key test and an essential computer-aided diagnostic tool for detecting gastric myoelectric abnormalities in diabetic gastroparesis and functional dyspepsia patients

Electrogastrography in Patients with Diabetic Gastroparesis

Electrogastrography (EGG) is an experimental non-invasive method that reflects the myoelectrical activity of the diabetic gastroparesis (D-GP) and healthy subjects gastric system. In clinical world, endoscopy and delayed gastric emptying diagnosis test are using for understand the D-GP patient's condition which are invasive, quite expensive and uncomfortable. Therefore our aim is to evaluate the Electrogastrography (EGG) features to discriminate the healthy subjects from patients with D-GP in real clinic. Total 25 patients D-GP and twenty 25 healthy subjects (HS) were included in this study. The recordings EGG parameters dominant frequency (DF) were analyzed and compared. The results we obtained from analysis of EGG signals proved that pre-fed (p= 0.048) and post-fed (p= 0.003) DF values were statistically significant between the D GP and HS groups. This study proved that it is possible to distinguish D-GP patients from healthy subject's with a high accuracy and a great success from the EGG signals recording correctly in real clinic

Effect of functional leg length inequality on the quadratus lumborum muscle by using EMG signal on asymptomatic population

Objectives: The objective of the study was to analyze the electromyography signals of quadratus lumborum muscle activity on pelvic asymmetry and leg length inequality as this might cause serious injuries in lumbar spine and lower extremity. Subjects and Methods: This was a randomized control trial with a total of 60 participants that were all are right handed and that were assessed manually and by tape measurement for leg length inequality then by electromyography (EMG) in two positions to determine the activity of quadratus lumborum muscle. Results: In the resting position, the power spectral density to analyze the EMG signals results showed that the right side upper pelvis crista iliac position EMG signals were higher in the right than the left side of the quadratus lumborum muscle. The left side upper pelvis crista iliac position had higher EMG signals on the left side than on the right side of the quadratus lumborum muscle activity. Moreover 98% of participants who have up right iliac crista also had short LLI. Additionally, 96% of participants who had up left iliac crista also had short LLI. Conclusions: In conclusion the present study shows that asymmetry in pelvis or QL activity can be caused by LLI which might cause serious injuries in the lower extremities or lumbar spine

Analysis of the quadratus lumborum muscle activity on leg length discrepancy: A randomized controlled trial

BACKGROUND: Quadratus lumborum (QL) discrete region extensions might change depending on whether leg length discrepancy (LLD) individually has any extra erector spinae action in the lumbar spine, which can result in serious injury to the lower extremities and lumbar vertebrae

Analysis of Gastric Myoelectrical Activity in Joint Hypermobility Syndrome

Joint Hypermobility Syndrome (JHS) is a common non-inflammatory rheumatologic disease characterized by abnormalities in collagen synthesis in the connective tissue. Various gastrointestinal system (GIS) problems such as dyspepsia, gastroesophageal reflux, and diarrhea may occur related to JHS. Gastric myoelectrical activity is evaluated by a non-invasive technique called electrogastrography (EGG) with cutaneous electrodes placed on the abdominal area. EGG signals are recorded from 12 JHS patients and 12 age and sex matched healthy controls in fasting and fed state with a standard test meal. Normogastria, bradygastria, tachygastria and dominant frequency (DF) parameters of the signals are evaluated. Both fasting and fed state bradygastria rates were higher in JHS group than controls. DF of the JHS group was statistically significantly lower than control group both in fasting and fed states

Analysis of EMG Signals in the Quadratus Lumborum Muscle of Healthy Subject with Functional Leg Length Discrepancy

The purpose of this study was to analyze the electromyography (EMG) signals of the Quadratus Lumborum (QL) muscle activity on leg length discrepancy (LLD) and pelvic asymmetry. So we investigated whether pelvic asymmetry might cause injuries in lumbar spine and lower extremity. This was a randomized control experiment, total 50 (25 males and 25 females) datas were analyzed. All participants were right handed. Iliac crest levels were assessed by manually and LLD measurement was used with tape. EMG signals of the QL muscle were taken in the resting position without any activity intentionally in the prone position. Analysis of the data revealed that the QL muscles activity were higher at the pelvic elevation on the right side than on the left side. While there was a shortness in the lower extremity 27% of the cases on the right condition but it was statistically determined that 23% of the left side was short. At the same time, 100% of the cases in the lower extremity on the right side were found to be in the right iliac crest elevation position. Unilateral hyperactivity of the QL muscle leads to instability of the spine and pelvic muscles and causing pelvis asymmetry and functional LLD As a result, unbalanced loading on the spine and lower extremities may result in injury