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Over the last two decades, high-resolution (HR) mapping has emerged as a powerful technique to study normal and abnormal bioelectrical events in the gastrointestinal (GI) tract. This technique, adapted from cardiology, involves the use of dense arrays of electrodes to track bioelectrical sequences in fine spatiotemporal detail. HR mapping has now been applied in many significant GI experimental studies informing and clarifying both normal physiology and arrhythmic behaviors in disease states. This review provides a comprehensive and critical analysis of current methodologies for HR electrical mapping in the GI tract, including extracellular measurement principles, electrode design and mapping devices, signal processing and visualization techniques, and translational research strategies. The scope of the review encompasses the broad application of GI HR methods from in-vitro tissue studies to in-vivo experimental studies, including in humans. Controversies and future directions for GI mapping methodologies are addressed, including emerging opportunities to better inform diagnostics and care in patients with functional gut disorders of diverse etiologies.
Over the last two decades, high-resolution (HR) mapping has emerged as a powerful technique to study normal and abnormal bioelectrical events in the gastrointestinal (GI) tract. This technique, adapted from cardiology, involves the use of dense arrays of electrodes to track bioelectrical sequences in fine spatiotemporal detail. HR mapping has now been applied in many significant GI experimental studies informing and clarifying both normal physiology and arrhythmic behaviors in disease states. This review provides a comprehensive and critical analysis of current methodologies for HR electrical mapping in the GI tract, including extracellular measurement principles, electrode design and mapping devices, signal processing and visualization techniques, and translational research strategies. The scope of the review encompasses the broad application of GI HR methods from in-vitro tissue studies to in-vivo experimental studies, including in humans. Controversies and future directions for GI mapping methodologies are addressed, including emerging opportunities to better inform diagnostics and care in patients with functional gut disorders of diverse etiologies.
Objective: to study the motor-evacuation function of the gastrointestinal tract in chronic duodenal stasis and the conjugation of their disorders with excessive bacterial growth.Materials and methods. Thirty patients with chronic duodenostasis (DS) aged 37.1 ± 13.8 years were examined. Anamnestic and physical data, results of X-ray and endoscopic examinations, intracavitarymanometry were used in the verification of DS. The determination of excess bacterial growth (IDB) in the small intestine was carried out by analyzing the results of the hydrogen respiratory test (VDT). The assessment of the motor function of the stomach and duodenum was carried out using the gastroenteromanometer GEM-01 “Gastroskan-GEM”. For conducting short-term pH-measurement, the Gastroskan-5M device was used.Results. All patients with DS presented dyspeptic complaints, revealed asthenic syndrome. In the postprandial period, impaired propulsive motility in all sections of the digestive tube was also expressed, which proves a 1.5-fold decrease in fasting urea, jejunum and ileum by 1.5 times in both phases of the study (p& <0.001). In patients with DS, IDB was detected in 22 (78.6%) cases. Among all examined patients in 19 (67.9%) patients, IDB was associated with increased bacterial activity in the small intestine. Colon dysbiosis was detected in 3 (10.7%) patients (χ2 = 7.093, p = 0.008). A correlation analysis between the hydrogen content in exhaled air and the rhythmic coefficient of the large intestine showed a reliable strong feedback (r& = 0.65, p = 0.015).Conclusion. A comprehensive study of the motor-evacuation function of the digestive system and the state of enteric microbiocenosis expands the possibilities of pathogenetically substantiated therapy for diseases of the organs of the gastroduodenobiliary pancreatic zone.
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