Week4_EGG_joshdean_section_30_Group_4_Week4 - ECE 3280...

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ECE 3280 Principles and Practice of Biomedical Engineering Laboratory Electrogastrogram Before and After a Meal Experiment Section 30, Group 4 Felipe Zambrano (33%) Joshua Dean (33%) and Keith Oldano (33%) Experiment Conducted September 23, 2011 Submitted September 30, 2011 Abstract Electrogastrograms (EGG) have been performed to see if a subject has irregular stomach muscle control or if the neurons have a miscommunication with the stomach muscles. An EGG senses the electrical current generated by the stomach muscles and its recording displays the occurring muscle interactions. However, an EGG is does not have a defined role in stomach disease diagnosis each. The group tested to see if it was possible to detect if a subject had normal stomach muscular behavior by performing an EGG on the subject before and after a meal. A subject with normal behavior should have a significant increase in the EGG waves of stomach electrical activity, which would be indicated by performing an FFT analysis measuring the amplitude and frequency of the raw EGG signals. A large percentage change between the before and after meal results would determine normal activity in the stomach. Our subject’s signals had
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a frequency of 0.0488Hz and amplitude of 0.0038mV before the meal and after the meal had a frequency of 0.0458Hz and amplitude of 0.0789mV for a total percentage change of 6.15% in frequency and 2076% in amplitude. Thus, our results indicate our subject having normal stomach activity. Additionally, our experiment demonstrates that an EGG can have a use in disease diagnostics and allows for others to expand. Introduction The experiment is heavily focused on the communication involving the neurons and the muscles of the gastrointestinal tract. The gastrointestinal tract is part of the gastric system, which includes the major organs: the mouth, stomach, small intestine, large intestine, and anus; and the accessory organs: salivary glands, liver, gallbladder and pancreas. Gastric system begins at the mouth, where food is mechanically processed, mixed with saliva, and compacted into a small mass called a bolus. The bolus travels down the esophagus through peristalsis and lands into the stomach where it is further broken-down by acid and enzymes. Additionally, the stomach connects to the small intestine, which deals with enzymatic digestion and undergoes the absorptions of water, ions, and organic substrates. From the small intestine, indigestible materials move to the large intestine where they are to be dehydrated and compacted for elimination through the anus. In the stomach, smooth muscles contract in sequence to produce peristaltic waves, which
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This note was uploaded on 11/14/2011 for the course ECE 3820 taught by Professor Wang during the Fall '11 term at GWU.

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Week4_EGG_joshdean_section_30_Group_4_Week4 - ECE 3280...

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