Physio git EGG.

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Electrogastrogram.

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Physio git EGG.

  1. 1. Electrogastrography (EGG): Dr. Mohamed Al-Shekhani Kurdistan board Gastroenterology physiology lectures.
  2. 2. Introduction: <ul><li>( EGG) is a non-invasive means of recording human gastric myoelectrical activity or slow waves using cutaneous electrodes placed on the anterior abdominal wall overlying the stomach,as there is good correlation between cutaneous EGG recordings & myoelectric signals recorded from gastric serosal leads. </li></ul><ul><li>The signal/noise ratio is low, so computer-aided analysis is essential. </li></ul><ul><li>EGG has been advocated as a diagnostic test for the clinical evaluation of patients with unexplained nausea, vomiting& other dyspeptic symptoms to gain insight into mechanisms of symptom generation. </li></ul><ul><li>EGG tracings exhibit sinusoidal waveforms with a predominant frequency of 3 cycles/minute (cpm). </li></ul><ul><li>The amplitude of the waveform increases with ingestion of caloric or non-caloric meals. </li></ul><ul><li>Some patients with nausea, vomiting, or other dyspeptic symptoms exhibit EGG rhythm disturbances or blunting of meal-evoked EGG signal amplitude increases& these correlate to some degree with delayed gastric emptying of solids. </li></ul>
  3. 3. Introduction: <ul><li>In selected patients, EGG may be complementary to gastric emptying testing. </li></ul><ul><li>To date, no therapies have convincingly demonstrated that correcting abnormalities detected by EGG improves upper gastrointestinal symptoms. </li></ul><ul><li>Proposed clinical indications for performance of EGG in patients with unexplained nausea, vomiting &dyspeptic symptoms must be validated by prospective controlled investigations. </li></ul>
  4. 4. Discovery <ul><li>William Beaumont– 1833 </li></ul><ul><ul><li>First to notice gastric psychological changes induced by various emotions. </li></ul></ul><ul><li>Later noted emotion causes increased and decreased gastric acid formation </li></ul><ul><li>Also causes reflux of bile into stomach causing the slowing of gastric emptying </li></ul>
  5. 5. <ul><li>October 14, 1921 </li></ul><ul><ul><li>First recording of Electrogastrogram </li></ul></ul><ul><ul><li>Scientists begin to discover changes due to specific stimuli such as stress and anxiety </li></ul></ul><ul><ul><li>Use EGG to measure gastric emptying </li></ul></ul>
  6. 6. EGG setup <ul><li>EGG signal is recorded by electrodes that are placed over the upper abdomen. </li></ul>
  7. 13. Data acquisition and analysis <ul><li>Bradygastrias(O-2.4cpm) </li></ul><ul><li>Tachygastrias(3.6-9.9cpm) </li></ul><ul><li>These Gastric Dysrhythmias have clinical relevance. </li></ul>
  8. 14. Applications <ul><li>Motion Sickness </li></ul><ul><li>Gastric Emptying and Motility </li></ul><ul><li>Nausea and Vomiting </li></ul><ul><li>Gastric Dysrhythmias </li></ul><ul><li>EGG in Children </li></ul>
  9. 16. Proposed Indications for EGG <ul><li>1.To non-invasively record gastric myoelectrical activity in patients with unexplained persistent or episodic symptoms which may be related to a gastric motility/or myoelectrical disorder. </li></ul><ul><li>2.To define gastric myoelectric disturbances in patients with nausea / vomiting unexplained by other diagnostic testing or associated with functional dyspepsia </li></ul><ul><li>3.To characterize gastric myoelectric disturbances associated with documented gastroparesis: </li></ul><ul><li>Performed after gastric emptying scanning & after trials of medications to reduce nausea/vomiting or in whom a radionuclide-based test would be relatively contraindicated including pregnant women or children. </li></ul>

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