An electrogastrogram (EGG) is similar in principle to an electrocardiogram (ECG) in that sensors on the skin detect electrical signals indicative of muscular activity within. Where the electrocardiogram detects muscular activity in various regions of the heart, the electrogastrogram detects the wave-like contractions of the stomach (peristalsis). Lead II An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which records the electrical voltage in the heart in the form of a continuous strip graph. ... Peristalsis is the process of involuntary wave-like successive muscular contractions by which food is moved through the digestive tract. ...
At the 2005 meeting of the American College of Gastroenterology, Dr Pankaj Pasricha said, "The addition of the EGG to standard polygraph methods has clear value in improving the accuracy of current lie detectors." The rhythmic contractions of the stomach appear to slow down when the subject is lying. Further studies will be required to validate these results and their applicability to lie detection. Polygraph results are sometimes recorded on a chart recorder A polygraph or lie detector is a device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked, in an attempt to detect lies. ... Polygraph results are sometimes recorded on a chart recorder A polygraph or lie detector is a device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked, in an attempt to detect lies. ...
The idea was first concieved by his high school daughter, Trisha Pasricha, who based her hypothesis on knowledge of gastroenterology (from her father) and lie detection (from her mother, Reena, the first woman engineer to work for the FBI). The widespread benefits of the EGG as a method of lie detection is currently being studied.
An apparatus for measuring an electrogastrogram and an intestinal electrogram including at least an electrode fixed to a body surface, an amplifier for amplifying a potential detected by said electrode, a low-pass filter for removing frequency signals other than the potentials of the stomach and the bowel amplified by said amplifier and a recorder.
Unless the low-pass filter used for the electrogastrogram and the intestinal electrogram is provided with the cut-off characteristics capable of removing the influences of respiration, is free from run-over of the phase characteristics and can make the phase change with respect to the frequency linear, practical measurement cannot be made.
The electrogastrogram and the intestinal electrogram can sufficiently evaluate the motion even by measurement of one channel, but multi-channel measurement is necessary to observe the motion of the stomach or to effect vector analysis.
An electrogastrogram is used when there is a suspicion that the muscles of the stomach or the nerves controlling the muscles are not working normally.
The electrogastrogram can be considered an experimental procedure since its exact role in the diagnosis of diseases of the stomach has not been defined yet.
For an electrogastrogram, several electrodes are taped onto the abdomen over the stomach in the same manner as electrodes on the chest for an electrocardiogram.
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