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electrical bioimpedance gastric motility measurement based on an electrical-mechanical composite mechanism

World Journal of Gastroenterology 2012年第25期18卷 3282-3287页

作者： Shu Zhao Hong Sha Zhang-Yong Li, Chao-Shi Ren Institute of BiomedicalEngineering Chinese Academy of Medical Sciences and PekingUnion Medical College Tianjin 300192 China College of Bioinformation Chongqing Univer-sity of Posts and Telecommunications Chongqing 400065 China

AIM： To introduce a bioimpedance gastric motility mea- surement method based on an electrical-mechanical composite concept and a preliminary clinical application. METHODS： A noninvasive gastric motility measure- ment method combining electrogastrograrn （EGG） and impedance gastric motility （IGM） test was used. Prelim- inary clinical application studies of patients with func- tional dyspepsia （FD） and gastritis, as well as healthy controls, were carried out. Twenty-eight FD patients （mean age 40.9±9.7 years） and 40 healthy volun- teers （mean age 30.9±7.9 years） were involved. IGM spectrum was measured for both the healthy subjects and FD patients, and outcomes were compared in the FD patients before treatment and 1 wk and 3 wk after treatment. IGM parameters were obtained from 30 erosive gastritis patients （mean age 50.5±13.0 years） and 40 healthy adults, and IGM and EGG results were compared in the gastritis patients before treatment and 1 wk after ***： There were significant differences in the IGM parameters between the FD patients and healthy subjects, and FD patients had a poorer gastric motility [percentage of normal frequency （PNF） 70.8±25.5 in healthy subjects and 28.3 =t= 16.9 in FD patients, P 〈 0.01]. After 1 wk administration of domperidone 10 mg, tid, the gastric motility of FD patients was not im- proved, although the EGG of the patients had returned to normal. After 3 wk of treatment, the IGM rhythm of the FD patients became normal. There was a significant difference in IGM parameters between the two groups （PNF 70.4：1：25.5 for healthy subjects and 36.1 4- 21.8 for gastritis patients, P 〈 0.05）. The EGG rhythm of the gastritis patients returned to normal （frequency insta- bility coefficient 2.22±0.43 before treatment and 1.77 ：t： 0.19 one wk after treatment, P 〈 0.05） after 1 wk of treatment with sodium rabeprazole tablets, 10 mg, qd, po, qm, while some IGM parameters showed a tenden- cy toward improvement but had not reached statistical si

关键词： Gastric motility electrical bioimpedance electrical-mechanical composite Electrogastrogram

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Gastric motility functional study based on electrical bioimpedance measurements and simultaneous electrogastrography

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 983-989页

作者： Zhang-yong LI Chao-shi REN Shu ZHAO Hong SHA Juan DENG College of Bioinformation Chongqing University of Posts and Telecommunications Chongqing 400065 China nstitute of Biomedical Engineering Chinese Academy of Medical Sciences ＆ Peking Union Medical College Tianjin 300192 China

For some time now,the research on gastric motility and function has fallen behind in the amount of research on gastric endocrine,exocrine secretion,and gastric *** this paper,a noninvasive method to study gastric motility was developed,taking bioimpedance measurements over the gastric area simultaneously with the electrogastrography(EGG).This is based on the concept of observing and analyzing simultaneously the intrinsic electrical gastric activity(basic electric rhythm) and the mechanical gastric ***,preliminary clinical studies of healthy subjects and subjects with functional dyspepsia(FD) and gastritis were carried *** impedance gastric motility(IGM) measurements of the healthy and FD subjects were compared,along with the studies of the FD subjects before treatment and after one week and three weeks of *** also compared IGM measurements of healthy subjects and subjects with erosive gastritis,along with the studies of the subjects with erosive gastritis before treatment and after one week of *** show that FD subjects have poor gastric motility(P0.05),These results suggest the possibility of clinic application of the proposed method.

关键词： Gastric motility electrical bioimpedance Electrogastrography Functional dyspepsia Gastritis

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Characterization of Short-Term Stress Applied to the Root System by electrical Impedance Measurement in the First Leaf of Corn(Zea mays L.)and Pumpkin(Cucurbita maxima L.)

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American Journal of Plant Sciences 2014年第9期5卷 1285-1295页

作者： Said Laarabi Department of Biology Laboratory of Plant PhysiologyUni-versity Mohammed V-AgdalFaculty of SciencesRabatMorocco

We applied electrical spectroscopic impedance measurements (ESI) to the first leaf of intact plants of corn and pumpkin. The electric capacity (C) and resistance (Rp) were determined at the characteristic frequency (FC). We observed that the electrical parameters of the ESI change in relation to the nutrition and the addition to the root medium of KCN, N,N'-dicyclohexylcar-bodiimide (DCCD), CH3COOH, H2SO4, polyethylene glycol 200 (PEG 200) and NaCl. The amplitude of the curves of bioimpedance spectrometry decreased when plant roots were stressed comparatively to their controls. An increase of the electrical capacity with a reduction of the electrical resistance characterizes a stress. The increase of stress intensity provokes decreases of Rp and curve amplitudes and an increase of C. We conclude that electrical parameters studied can be widely used for stress characterization.

关键词： Abiotic Stress Characterization Corn and Pumpkin electrical bioimpedance in Vivo Diagnosis Foliar Root-Environment

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Bioelectrical impedance vector analysis evaluates cellularity and hydration in cirrhotic patients

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World Journal of Hepatology 2020年第12期12卷 1276-1288页

作者： Sabrina Alves Fernandes Lara Rigon Leonhardt Daniella Miranda da Silva Fernanda Donner Alves Claudio Augusto Marroni Department of Nutrition Centro Universitario Metodista IPAPorto Alegre 90420-060RSBrazil Gastroenterology and Hepatology Universidade Federal de Ciências da Saúde de Porto Alegre(UFCSPA)Porto Alegre 91760-470RSBrazil Postgraduate Program in Hepatology Universidade Federal de Ciências da Saúde de Porto Alegre(UFCSPA)Porto Alegre 90050-170RSBrazil Department of Nutrition Centro Universitario Ritter dos Reis-UniritterPorto Alegre 90840-440Rio Grande do SulBrazil

BACKGROUND Malnutrition in cirrhotic patients is correlated with mortality and a better response to liver ***,recovery of the nutritional status in these patients is a challenge due to the difficulty in establishing a reliable nutritional *** bioelectrical impedance vector analysis(BIVA)method appears as a feasible tool in clinical practice to define the physiological state of cirrhotic patients by assessing hydration and body *** To evaluate body composition in cirrhotic patients using *** This retrospective cross-sectional study was carried out by following cirrhotic outpatients at a hospital in Porto Alegre,Brazil.A tetrapolar bioelectrical impedance analysis device was used to evaluate cellularity and hydration and to perform the *** BIVA graphic was elaborated by software and for statistical analysis a significance level of 5%(P≤0.05)was *** One hundred and ninety patients,61.1%males,with a mean age of 56.6±11.0 years,were *** these,56.3%had Child-Turcotte-Pugh(CTP)A score,and the prevalent etiology was hepatitis C virus(47.4%).The patients were classified according to cellularity and hydration by the quadrants and ellipses of the BIVA method,quadrant 1(47.9%);quadrant 2(18.9%);quadrant 3(14.2%);and quadrant 4(18.9%).Those classified in quadrant 1 and 2 had a higher phase angle compared to those in quadrants 3 and 4(P<0.001).Quadrant 2 patients had a lower average age than the other *** association with CTP score showed that patients in quadrant 2 had a higher proportion of CTP A,and those in quadrant 4 had a higher proportion of CTP C(P<0.052).CONCLUSION The BIVA method allows identification of the cellularity and hydration status of cirrhotic patients,and its association with clinical factors determines the disease severity,age and prognostic index.

关键词： Body composition Hydration Cellularity Hepatic cirrhosis electrical bioimpedance Bioelectrical impedance vector analysis

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Role of the phase angle in the prognosis of the cirrhotic patient:15 years of follow-up

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World Journal of Methodology 2023年第4期13卷 238-247页

作者： Letícia Pereira Pinto Claudio Augusto Marroni Juliana Czermainski Maria Luiza Fernandes Dahlem Randhall B Carteri Sabrina Alves Fernandes Department of Hepatology Universidade Federal de Ciências da Saúde de Porto AlegrePorto Alegre 90050-170Brazil Department of Veterinary Medicine Universidade Federal do Rio Grande do SulPorto Alegre 91540-000Brazil Department of Nutrition Centro Universitário Metodista IPAPorto Alegre 90420-060Brazil Department of Nutrition Centro Universitário CesucaCachoerinha 94935-630Brazil

BACKGROUND In 2019,cirrhosis accounted for 2.4%of global *** projection for 2030 is an increase in this *** recent years,hospitalization costs have escalated by 36%for compensated cirrhosis and 24%for decompensated ***,it is necessary to identify a tool capable of predicting the mortality of these patients according to their clinical condition and consequently extending their survival *** studies have shown that the phase angle(PA)can be a feasible method in clinical practice,with the potential to guide assertive patient management in the therapeutic of chronic liver *** To evaluate the prognostic role of PA in cirrhotic patients over a 15-year followup *** Retrospective cohort study with 129 cirrhotic patients of both sexes over 18 years *** of cirrhosis by liver *** first year of data collection was 2007,and data regarding outcomes was collected in *** were gathered from medical records,such as esophageal varices(EV),EV bleeding,ascites,spontaneous bacterial peritonitis(SBP),encephalopathy,laboratory findings and *** cut-off value for the PA was 5.4°,a value described in 2012 by Fernandes et al for 129 patients evaluated in this study and the cut-off points for the Brazilian population presented in percentiles(P),as described by Mattiello et *** mortality was assessed using the PA percentile through Kaplan-Meier curves and multivariate binary logistic regression *** Patients were divided into two groups according to the PA 5.4th(PA>5.4°,n=40;PA≤5.4°,n=89)PA percentile(

关键词： Liver cirrhosis Phase angle Prognosis Liver transplantation electrical bioimpedance

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