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    Bioimpedance vector analysis and conventional bioimpedance to assess body composition in elderly adults with dementia  Open access

     Camina, Alicia; de Mateo Silleras, Beatriz; Nescolarde Selva, Lexa Digna; Barrera, Sara; Domínguez, Luis; Redondo, Mª Paz
    Nutrition
    Date of publication: 2014-07-05
    Journal article

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    Rationale Although dementia and nutritional status have been shown to be strongly associated, differences in body composition (BC) among elderly with dementia have not yet to be firmly established. Objective To assess the BC through conventional and vector bioimpedance analysis (BIA and BIVA, respectively) in a sample of institutionalized elderly men with and without dementia, in order to detect dementia-related BC changes. Methods Forty-one institutionalized men aged 65 years or older (23 without dementia- CG- and 18 with dementia-DG-) were measured with BIA and interpreted with BIVA and predictive equations. Results Age (74.4 and 75.7 y) and BMI (22.5 and 23.6 kg/m2) were similar for DG and CG, respectively. Resistance and resistance/height ratio did not differ significantly between groups Reactance and reactance/height ratio were 21.2 and 20.4% lower in DG than in CG. Phase angle was significantly lower in DG (mean: 4.0; 95% CI: 3.6-4.3 degrees) than in CG (mean: 4.7; 95% CI: 4.3-5.1 degrees). Mean fat mass index (6.0 and 7.0 kg/m2), and mean fat-free mass index (16.4 and 16.6 kg/m2) were similar in DG and CG. BIVA showed a significant downward migration of the ellipse in DG with respect to CG (T2=15.1, p<0.01). Conclusion Conventional BIA showed no significant differences in BC between DG and CG, even though reactance and reactance/height were about 21% lower in DG. Nevertheless, a body cell mass depletion and an increase in the extracellular/intracellular water-ratio were identified in DG using BIVA. BIVA reflects dementia-related changes in BC better than BIA.

    Rationale Although dementia and nutritional status have been shown to be strongly associated, differences in body composition (BC) among elderly with dementia have not yet to be firmly established. Objective To assess the BC through conventional and vector bioimpedance analysis (BIA and BIVA, respectively) in a sample of institutionalized elderly men with and without dementia, in order to detect dementia-related BC changes. Methods Forty-one institutionalized men aged 65 years or older (23 without dementia- CG- and 18 with dementia-DG-) were measured with BIA and interpreted with BIVA and predictive equations. Results Age (74.4 and 75.7 y) and BMI (22.5 and 23.6 kg/m2) were similar for DG and CG, respectively. Resistance and resistance/height ratio did not differ significantly between groups Reactance and reactance/height ratio were 21.2 and 20.4% lower in DG than in CG. Phase angle was significantly lower in DG (mean: 4.0; 95% CI: 3.6-4.3 degrees) than in CG (mean: 4.7; 95% CI: 4.3-5.1 degrees). Mean fat mass index (6.0 and 7.0 kg/m2), and mean fat-free mass index (16.4 and 16.6 kg/m2) were similar in DG and CG. BIVA showed a significant downward migration of the ellipse in DG with respect to CG (T2=15.1, p<0.01). Conclusion Conventional BIA showed no significant differences in BC between DG and CG, even though reactance and reactance/height were about 21% lower in DG. Nevertheless, a body cell mass depletion and an increase in the extracellular/intracellular water-ratio were identified in DG using BIVA. BIVA reflects dementia-related changes in BC better than BIA.

  • Localized bioimpedance to assess muscle injury

     Nescolarde Selva, Lexa Digna; Yanguas Leyes, Javier; Lukaski, Henry; Alomar, Xavier; Rosell Ferrer, Francisco Javier; Rodas Font, Gil
    Physiological measurement
    Date of publication: 2013-01
    Journal article

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  • An implantable bioimpedance monitor using 2.45 GHz band for telemetry

     Bogonez Franco, Francisco; Nescolarde Selva, Lexa Digna; Gálvez Montón, Carolina; Bragos Bardia, Ramon; Rosell Ferrer, Francisco Javier
    Physiological measurement
    Date of publication: 2013-01
    Journal article

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    Reference values of the bioimpedance vector components in a Caribbean population  Open access

     Nescolarde Selva, Lexa Digna; Núñez, Ana; Bogonez Franco, Francisco; Lara, Alcibiades; Vaillant, Guillermo; Morales, Ricardo; Rosell Ferrer, Francisco Javier
    e-SPEN, the European e-Journal of Clinical Nutrition and Metabolism
    Date of publication: 2013-07-23
    Journal article

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    Background & aims Application of bioelectrical impedance vector analysis (BIVA) requires comparison of an impedance vector to reference intervals derived from healthy subjects. The aim of this work is to obtain reference nomograms of bioimpedance vectors from healthy subjects living in Santiago de Cuba. Methods A sample of 4030 healthy people, ages 2¿80 y, was measured using a tetra-polar whole-body bioimpedance analyzer at 50 kHz. BIVA method uses the 50, 75 and 95% confidence ellipses of reference populations to classify individual and group vectors. Results The 95% confidence ellipses derived among boys and girls (2¿12 y) were similar (P > 0.05) with significant gender differences (P < 0.05) throughout adulthood. Furthermore, we can observe a progressive decrease in the modulus of the impedance with age with the same phase angle from 13 to 59 y. However, in both genders on subjects >60 y we also observed a phase downfall, possibly due to the reduction of mass and structure, by sarcopenia. Conclusions Reference ellipses are provided, distributed in six sets resulting in age separation intervals (not in gender) for children from 2 to 12 y; two gender specific reference ellipses for teenagers in the range of 13¿16 y, for adults from 17 to 59 y and for elderly people from 60 to 80 y.

    Background & aims Application of bioelectrical impedance vector analysis (BIVA) requires comparison of an impedance vector to reference intervals derived from healthy subjects. The aim of this work is to obtain reference nomograms of bioimpedance vectors from healthy subjects living in Santiago de Cuba. Methods A sample of 4030 healthy people, ages 2–80 y, was measured using a tetra-polar whole-body bioimpedance analyzer at 50 kHz. BIVA method uses the 50, 75 and 95% confidence ellipses of reference populations to classify individual and group vectors. Results The 95% confidence ellipses derived among boys and girls (2–12 y) were similar (P > 0.05) with significant gender differences (P < 0.05) throughout adulthood. Furthermore, we can observe a progressive decrease in the modulus of the impedance with age with the same phase angle from 13 to 59 y. However, in both genders on subjects >60 y we also observed a phase downfall, possibly due to the reduction of mass and structure, by sarcopenia. Conclusions Reference ellipses are provided, distributed in six sets resulting in age separation intervals (not in gender) for children from 2 to 12 y; two gender specific reference ellipses for teenagers in the range of 13–16 y, for adults from 17 to 59 y and for elderly people from 60 to 80 y.

  • Assessment and Follow-Up Muscle Injuries in Professional Football Players by Segmental Bioimpedance Measurements

     Yanguas Leyes, Javier
    Defense's date: 2013-12
    Universitat Autònoma de Barcelona
    Theses

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  • Caracterización de los efectos agudos del ejercicio excéntrico sobre los músculos isquiotibiales, mediante técnicas de RMI, Biomarcadores de daño muscular y bioimpedancia localizada

     Nescolarde Selva, Lexa Digna; Cadefau, Joan; Rodas Font, Gil; Alomar, Xavier; Balius, Ramon; Padullés, Josep Maria; Mendiguchia, Jurdan
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  • Localized BIA in muscle injuries

     Nescolarde Selva, Lexa Digna; Yanguas Leyes, Xavier; Alomar, Xavier; Lukaski, Henry; Rodas Font, Gil
    5th MuscleTech Network Workshop
    Presentation's date: 2013-10-14
    Presentation of work at congresses

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  • Characterization of acute effects of eccentric exercises on hamstring muscles by MR techniques, localized bioimpedance and creatine kinase

     Alomar, Xavier; Balius, Ramon; Cadefau, Joan; Carmona, Gerard; Cussó, Roser; Mendiguchia, Jurdan; Nescolarde Selva, Lexa Digna; Rodas Font, Gil; Yanguas Leyes, Xavier
    5th MuscleTech Network Workshop
    Presentation's date: 2013-10-14
    Presentation of work at congresses

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  • Influence of electrode mismatch on cole parameter estimation from total right side electrical bioimpedance spectroscopy measurements

     Buendía, Rubén; Bogonez Franco, Francisco; Nescolarde Selva, Lexa Digna; Seoane, Fernando
    Medical engineering and physics
    Date of publication: 2012-08-31
    Journal article

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  • Segmental bioimpedance measurement for assessment of muscle-tendon in lower-limb

     Nescolarde Selva, Lexa Digna; Yanguas Leyes, Xavier
    MuscleTech Network Workshop
    Presentation's date: 2012-10-03
    Presentation of work at congresses

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  • Bioelectrical impedance vector analysis (BIVA) in stable and non-stable heart failure patients: A pilot study

     Gastelurrutia, Paloma; Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Domingo, Maite; Ribas, Núria; Bayés-Genis, Antoni
    International journal of cardiology
    Date of publication: 2011-01-21
    Journal article

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  • Localized bioimpedance measurements to assess muscle Injuries in the four major groups of lower limb

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Rodas Font, Gil; Yanguas Leyes, Xavier
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    Assessment and follow-up of muscle injuries by segmental byoimpedance.  Open access

     Nescolarde Selva, Lexa Digna; Yanguas Leyes, Xavier
    MuscleTech Network Workshop
    Presentation's date: 2011-09-27
    Presentation of work at congresses

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  • Assessment and follow-up of muscle injuries in athletes by bioimpedance: Preliminary results

     Nescolarde Selva, Lexa Digna; Yanguas Leyes, Javier; Medina Leal, Daniel; Rodas Font, Gil; Rosell Ferrer, Francisco Javier
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2011-09-02
    Presentation of work at congresses

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    Mono-frequency (50 kHz) whole-body and segmental bioimpedance is measured before sport training in 14 high performance athletes. The athletes are classified in two groups according to the team sport: football and basketball. Bioelectrical impedance vector analysis (BIVA) method is used to obtain the individual whole-body impedance and 6 segmental impedance vectors in the main muscular groups in the lower- limbs. The whole-body vector is analyzed in the tolerance ellipses of the reference population. Individual impedance vector components are standardized by the height H of the subject, (R/H and Xc/H) to obtain the impedance vector (Z/H) of each segment. The hypotheses of the study are: 1) Not all the sports have the same pattern of bioimpedance vector by muscle group. 2) In elite well trained athletes their muscle groups are symmetrical (right and left sides), thus each athlete is its own reference for future comparisons. 3) We expect a change in the two components of bioimpedance vector (R/H and Xc/H) in front of a muscle injury. In order to compare the differences between the complex Z/H vector (R/H, Xc/H) we use Hotelling s T2 test. Preliminary results show a significant difference (P < 0.05) in bioimpedance vectors between groups according to the team sport, and also between normal muscle condition and after muscle injury producing hyper-hydration.

  • Muscle fatigue monitoring using a multifrequency bioimpedance technique

     Vescio, Giovanni; Rosell Ferrer, Francisco Javier; Nescolarde Selva, Lexa Digna; Giovinazzo, Giuseppe
    European Conference of the International Federation for Medical and Biological Engineering
    Presentation's date: 2011-09
    Presentation of work at congresses

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    The objective of this work is to measure the changes of electrical bioimpedance module and phase related to muscular fatigue. The results could also be interesting for medical diagnosis of leg oedema, related to heart diseases, or muscular lesions. With this purpose in mind we have done multifrequency bioimpedance measurements on volunteers to evaluate the change of the impedance due to some physical exercises with the leg and with the arm. In the case of the measures performed on the arm we have obtained an initial increase of the impedance module after the first three exercises. The change of the impedance module taken after the 5th exercise respect to the first measurement was significantly lower (p<0.05) at all frequencies. In the case of the measures performed on the leg we have obtained an increase of the impedance module after the first four exercises if compared with the module at rest. The measured module after the first exercise was significantly different respect to the module at rest (p<0.05) for frequencies lower than 50 kHz. Subsequently, making the measurement after the fifth exercise we have obtained a decrease of the impedance module, if it is compared with the previous measurement. The change of the module measured after the 6th exercise is greater than the system noise if compared with the 1st impedance measurement but this change is not significant, if compared to the first measurement, at all frequencies.

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    Longitudinal and transversal bioimpedance measurements in addition to diagnosis of heart failure  Open access

     Ribas, Núria; Nescolarde Selva, Lexa Digna; Domingo, Maite; Gastelurrutia, Paloma; Bayés-Genis, Antoni; Rosell Ferrer, Francisco Javier
    International Conference on Electrical Bio-Impedance
    Presentation of work at congresses

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    Heart Failure (HF) is a clinical syndrome characterised by signs of systemic and pulmonary fluid retention, shortness of breath and/or fatigue. There is a lack of reliable indicators of disease state. Benefits and applicability of non-invasive bioimpedance measurement in the hydration state of soft tissues have been validated, fundamentally, in dialysis patients. Four impedance configurations (2 longitudinal and 2 transversal) were analyzed in 48 HF patients (M=28, F=20) classified according to a clinical disease severity score (CDSS) derived from the Framingham criteria: CDSS 2 (G1: M= 23, F= 14) and CDSS>2 (G2: M= 5, F= 6). The aim of this study is to analyze longitudinal and transversal bioimpedance measurement at 50 kHz, in addition to clinical diagnosis parameters of heart failure, including: clinical disease severity score (CDSS) and a biomarker concentrations (NTproBNP). The Kolmogorov-Smirnov test was used for the normality test of all variables. The CDSS, NTproBNP and impedance parameters between groups (G1 and G2) were compared by mean of Mann Withney U-test. The statistical significance was considered with P < 0.05. Whole-body impedance measured was analyzed using RXc graph.

  • Medical engineering and physics

     Nescolarde Selva, Lexa Digna
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  • Applications of longitudinal and transversal bioimpedance measurements in peritoneal dialysis at 50 kHz

     Nescolarde Selva, Lexa Digna; Doñate, T.; Casañas, R.; Rosell Ferrer, Francisco Javier
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

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    More relevant information of the fluid changes in peritoneal dialysis (PD) might be obtained with segmental bioimpedance measurements rather than whole-body measurement, who hidden information of body composition. Whole-body and segmental bioimpedance measurements were obtained using 5 configurations (whole-body or right-side (RS), longitudinal-leg (L-LEG), longitudinal-abdomen (L-AB), transversal-abdomen (T-AB), and transversal-leg (T-LEG)) in 20 patients: 15 males (56.5 ± 9.4 yr, 24.2 ± 4.2 kg/m2) and 5 females (58.4 ± 7.1 yr, 28.2 ± 5.9 kg/m2) in peritoneal dialysis (PD). The aim of this study is to analyze the relationship between whole-body, longitudinal-segmental (L-LEG and L-AB) and transversal-segmental (TAB and TLEG) bioimpedance measurement at 50 kHz, with clinical parameters of cardiovascular risk, dyslipidemia, nutrition and hydration. The Kolmogorov- Smirnov test was used for the normality test of all variables. Longitudinal bioimpedance parameters were normalized by the height of the patients. The Spearman correlation was used to analyze the correlation between bioimpedance and clinical parameters. The statistical significance was considered with P < 0.05. Transversal bioimpedance measurements have higher correlation with clinical parameters than longitudinal measurements.

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    Measurement errors in multifrequency bioelectrical impedance analyzers with and without impedance electrode mismatch  Open access

     Bogonez Franco, Francisco; Nescolarde Selva, Lexa Digna; Bragos Bardia, Ramon; Rosell Ferrer, Francisco Javier; Yandiola, Iñigo
    Physiological measurement
    Date of publication: 2009-06-03
    Journal article

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    The purpose of this study is to compare measurement errors in two commercially available multi-frequency bioimpedance analyzers, a Xitron 4000B and an ImpediMed SFB7, including electrode impedance mismatch. The comparison was made using resistive electrical models and in ten human volunteers. We used three different electrical models simulating three different body segments: the right-side, leg and thorax. In the electrical models, we tested the effect of the capacitive coupling of the patient to ground and the skin–electrode impedance mismatch. Results showed that both sets of equipment are optimized for right-side measurements and for moderate skin–electrode impedance mismatch. In right-side measurements with mismatch electrode, 4000B is more accurate than SFB7. When an electrode impedance mismatch was simulated, errors increased in both bioimpedance analyzers and the effect of the mismatch in the voltage detection leads was greater than that in current injection leads. For segments with lower impedance as the leg and thorax, SFB7 ismore accurate than 4000B and also shows less dependence on electrode mismatch. In both devices, impedance measurements were not significantly affected (p > 0.05) by the capacitive coupling to ground.

  • GRUP D'INSTRUMENTACIÓ ELECTRÒNICA I BIOMÈDICA: Grup de Recerca Consolidat.

     Bragos Bardia, Ramon; Rosell Ferrer, Francisco Javier; Fernandez Chimeno, Mireya; Garcia Gonzalez, Miquel Angel; Nescolarde Selva, Lexa Digna; Ramos Castro, Juan Jose; Riu Costa, Pere Joan; Robert i Sanxis, Francesc Josep; Silva Martinez, Fernando; Torrents Dolz, Josep Maria
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  • DESARROLLO DE TECNICAS DE MONITORIZACIÓN NO DESTRUCTIVA Y MINIMAMENTE INVASIVA EN APLICACIONES DE INGENIERIA CELULAR....

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Sánchez Terrones, B.; Bogonez Franco, Francisco; Bragos Bardia, Ramon
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    Total body water changes using segmental bioimpedance in healthy population with similar anthropometry  Open access

     Rosell Ferrer, Francisco Javier; Nescolarde Selva, Lexa Digna; Elvira, J.
    World Congress on Medical Physics and Biomedical Engineering
    Presentation's date: 2009-09
    Presentation of work at congresses

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    Electrical bioimpedance was measured in 7 body segments, and also with the standard right-side method, using 11 electrodes at 6 different frequencies in 8 healthy male subjects with similar anthropometry. Our objective was to determine the capability of segmental bioimpedance measurements to estimate small changes of water on each segment (TWsegi)and total body water (TBW) in comparison with the standard right-side method. Water was also estimated with 40K and DXA. Volunteers were measured before and after a 3.5% water load of their individual TBW. The expected TBW mean increment after water load was 1.45 l. The estimator with lower Standard Error SE was the weight of the subject (0.15 l). For impedance methods, the SE of the segmental method was 0.94 l vs. 1.41 l for right-side. Segmental volume changes obtained by DXA and Impedance compared with expected values showed maximum differences of almost 2 l for DXA and 0.5 l for Z in the abdomen. In conclusion, in a healthy sample with similar anthropometry, such as astronauts and athletes, the use of a segmental impedance method improves the accuracy of the right-side method to estimate TBW. Changes in water segments estimated by impedance where more close to expected values than using DXA.

    Postprint (author’s final draft)

  • Avaluació de la qualitat partint de la SEEQ i enquestes adaptades utilitzant tècniques estadístiques  Open access

     Corbalán Fuertes, Montserrat; Aldabas Rubira, Emiliano; Nescolarde Selva, Lexa Digna; Gallardo, J A; Gago Barrio, Javier; Gonzalez, D
    Jornada d'Innovació Docent UPC
    Presentation's date: 2009-02-05
    Presentation of work at congresses

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    Dissenyar una metodologia per conèixer l’opinió de l’alumne respecte a l’assignatura i el professorat que la imparteix. Enfortir l’intercanvio d’experiències i metodologies entre els docents. Generar una metodologia d’anàlisis dels resultats que permeti un anàlisis quantitatiu i relativament senzill. S’han utilitzat els Qüestionari d’Incidències Crítiques (QICs) i l’enquesta als estudiants coneguda com SEEQ (Student Evaluations of Educational Quality). Dissenyar tasques d’avaluació, de forma que es pugui comprovar si els estudiants han après el que els objectius senyalen que hauríem d’haver après. Aquestes tasques consisteixen en generar test autoavaluatius en moodle. Es desitja establir una forma de treballar que permeti partint d’un document word generar les preguntes per un becari mitjançant un programa que interpretarà el moodle i que resulti fàcil pel professor. Generar la documentació necessària per la realització de les diferents tasques i facilitar així la labor dels professors i els becaris.

  • Nutrition

     Nescolarde Selva, Lexa Digna
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  • Comment on: "Is bioelectrical impedance vector analysis of value in the elderly with malnutrition and impaired functionality"

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Gastelurrutia, Paloma; Bayés-Genis, Antoni; Calpe, J; Hernández, R
    Nutrition
    Date of publication: 2009-02
    Journal article

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  • Comparison of segmental with whole-body impedance measurements in peritoneal dialysis patients

     Nescolarde Selva, Lexa Digna; Doñate, T; Piccoli, A; Rosell Ferrer, Francisco Javier
    Medical engineering and physics
    Date of publication: 2008-09
    Journal article

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  • Relationship between segmental and whole-body phase angle in peritoneal dialysis patients

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier
    Physiological measurement
    Date of publication: 2008-09
    Journal article

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  • Whole-body and Thoracic Bioimpedance Measurement: Hypertension and hyperhydratation in Hemodialyisis patients

     Nescolarde Selva, Lexa Digna; Bogonez Franco, Francisco; Calpe, J; Hernández, R; Doñate, T; Rosell Ferrer, Francisco Javier
    IEEE Engineering in Medicine and Biology Society
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  • Red de Insuficiencia Cardiaca (REDINSCOR). Red del Instituto de Salut Carlos III.

     Rosell Ferrer, Francisco Javier; Nescolarde Selva, Lexa Digna; Ramos Castro, Juan Jose; Garcia Gonzalez, Miquel Angel; Sánchez Terrones, B.; Giovinazzo, Giuseppe
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  • DIFFERENT IMPEDANCE INDEXES IN SEGMENTAL AND WHOLE-BODY MEASUREMENTS IN PERITONEAL DIALYSIS PATIENTS

     Nescolarde Selva, Lexa Digna
    International Conference on Electrical Bio-impedance
    Presentation's date: 2007-08-29
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  • Different impedance indexes in segmental and whole-body measurements in peritoneal dialysis patients

     Nescolarde Selva, Lexa Digna; Doñate, T; Garcia Gonzalez, Miquel Angel; Rosell-Ferrer, J; Rosell Ferrer, Francisco Javier
    International Conference on Electrical Bio-impedance
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  • Physiological measurement

     Nescolarde Selva, Lexa Digna
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  • Segmental and whole body electrical impedance measurements in dialysis patients  Open access

     Nescolarde Selva, Lexa Digna
    Defense's date: 2006-07-20
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    The main objective of this thesis is to contribute to the prevention and control of the cardiovascular risk, hydration state and nutritional state in dialysis patients using non-invasive electrical impedance measurements. The thesis is structured in three parts with the following objectives: 1) to establish electrical impedance reference data for healthy Cuban population, 2)to improve the diagnostic based on impedance methods in Cuban hemodialysis (HD)patients and 3) to develop the impedance methods for continuous ambulatory peritoneal dialysis patients (CAPD).Healthy population: We analyzed the impedance vector distribution using the Bioimpedance Vector Analysis (BIVA) for the three more representative race-ethnicities in Cuba. We measured 1196 healthy adult (689 M, 507 W, 18-70 yr). The 95% confidence ellipses were drawn using specific BIVA software for mean vectors of different races. Due to the close distribution of mean vectors that we found for the three race-ethnicities, we concluded that only one set of sex-specific tolerance ellipses can be used for the Cuban population.HD patients: The BIVA method was used in a sample of 74 HD patients in stable (without edema) and critical (hyper-hydrated and malnutrition) states in order to establish the relation between hyper-hydration and mortality. Stable group include 48 patients (28 M and 18 W), and critical group include 28 critical patients (16 M and 12 W). Student's t test and Hotelling's T2 test were used to analyse the separation of groups obtained by means of clinical diagnosis and those obtained by BIVA. A statistically significant difference was obtained (P < 0.05) in R/H, Xc/H and phase angle, PA. Critical patients (hyper-hydrated and malnutrition) were located below the inferior pole of the 75% tolerance ellipse, with PA lower than 4º. In conclusion, the BIVA method could be used to detect hyper-hydration state before edema appears, and to predict survival through PA. Advantages of the method are its simplicity, objectivity and that it does not require the definition of a patient dry weight.CAPD patients: Segmental impedance measurements were obtained using 9 configurations (7 longitudinal and 2 transversal) in 25 CAPD male patients.In a first study we analyzed Z, Z/H and ZBMI indexes. 23 male patients were classified according to the hydration state as normo-hydrated, group 0 (10 M) or hyper-hydrated, group 1 (13 M). Wilcoxon test was used to analyze the change in impedance produced by a PD session. Mann-Whitney U test was used to analyse the separation between groups obtained by means of clinical diagnosis and those obtained by Z, Z/H or ZBMI. Spearman correlation was used to study the correlation between impedance vectors in each segment and clinical assessment. Statistical significance was set at P < 0.05. Results show that ZBMI gives information about the specific resistivity of tissues and not about fluid and fat mass changes. BIVA separate hyper-hydrated and normo-hydrated patients. Transversal measurements in the leg region and longitudinal in the thorax region are useful to corroborate the hydration and nutritional state in CAPD patients.In a second study a new classification was performed. Group 0 has normo-hydrated patients (10 M) and group 1 includes patients (15 M) with varying degrees of hypertension, overhydration and high score on cardiovascular risk factors. Mann-Whitney U-test was used to compare the differences in clinical measurements, laboratory test, and bioimpedance measurements between groups. The Mahalanobis Distance (dM2) was calculated using a bidimensional space, using the resistance measurement, right-side (RRS/H) or thorax segment (RTH/H) and the BPmean. Hotelling's T2 test was used to analyzed difference between groups through (RTH/H, BPmean) and (RRS/H, BPmean) vectors. A statistically significant difference was obtained (P < 0.05) in both vectors. Group 1 showed a small dM2 with respect to a reference patient (a critical patient with acute lung oedema) with high BPmean and low values of RTH/H and RRS/H. Moreover, Group 0 showed a larger dM2 with respect to the reference patient with lower BPmean and higher values of RTH/H and RRS/H. All patients classified as hyper-hydrated leading to hypertension by clinical assessment were correctly classified using dM2(RTH/H, BPmean). We conclude that segmental bioimpedance of the thoracic region could be a simple, objective, non-invasive method of support to facilitate the clinical assessment in CAPD.

  • Medidas de "whole-body" y segmentales en pacientes en CAPD y su relación con la clínica

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Garcia Gonzalez, Miquel Angel; Doñate, T; Piccoli, A
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation of work at congresses

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  • Medidas de "whole-body" y segmentales en pacientes en CAPD y su relación con la clínica

     Nescolarde Selva, Lexa Digna
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation's date: 2006-11-06
    Presentation of work at congresses

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  • Medidas de "whole-body" y segmentales en pacientes en diálisis (HD y DP) y su relación con la clínica

     Nescolarde Selva, Lexa Digna; García, M A; Tamayo, J; Doñate, T; Piccoli, A
    JCEE'06 - XII Jornades de Confèrencies. Tendències, aplicacions, recerca i docència en el camp de l'Enginyeria Electrònica
    Presentation of work at congresses

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  • Thoracic vs Whole-Body bioimpedance measurements; relation to hydration status and hypertension in peritoneal dialysis patients

     Nescolarde Selva, Lexa Digna; García-González, M A; Garcia Gonzalez, Miquel Angel; Rosell Ferrer, Francisco Javier; Doñate, T; Querfeld, U
    Physiological measurement
    Date of publication: 2006-10
    Journal article

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  • Bioimpedance phase angle measurement: Relation with hydration and nutrition

     Doñate, T; Nescolarde Selva, Lexa Digna; Rosell, J
    25th Annual Dialysis Conference
    Presentation of work at congresses

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  • Anàlisis de la composició corporal en una mostra de pacients amb VIH/SIDA, mitjançant la espectroscopia de impedancia elèctrica

     Nescolarde Selva, Lexa Digna; Riu Costa, Pere Joan
    Participation in a competitive project

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  • Utilidad de las medidas segmentales-monofrecuencia en pacientes en diálisis peritoneal

     Nescolarde Selva, Lexa Digna; Bogonez Franco, Francisco; Riu, P; Bragos Bardia, Ramon; Doñate, T
    V Reunión Nacional de Diálisis Peritoneal
    Presentation of work at congresses

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  • Lung edema detection by segmental single-frequency bioimpedance measurements

     Nescolarde Selva, Lexa Digna; Bogonez Franco, Francisco; Riu, P; Bragos Bardia, Ramon; Rosell, J; Doñate, T
    25th Annual Dialysis Conference
    Presentation of work at congresses

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  • Medición del ángulo de fase de bioimpedancia: Relación con hidratación, inflamación y nutrición

     Doñate, T; Nescolarde Selva, Lexa Digna
    V Reunión Nacional de Diálisis Peritoneal
    Presentation of work at congresses

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  • INFLUENCE OF RACE ON IMPEDANCE VECTOR POSITION IN THE R-XC PLANE

     Nescolarde Selva, Lexa Digna
    International Conference on Electrical Bio-impedance
    Presentation's date: 2004-06-20
    Presentation of work at congresses

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  • Agua corporal total y su distribución: intervalos de lo normal en el estudio mediante bioimpedancia eléctrica de una población de referencia

     Román, A Núñez A; Morales, R; Lara, A; Marañón, M; Nescolarde Selva, Lexa Digna
    I Simposio Internacional de Ciencias Biológicas "Charles T. Ramsden In Memoriam"
    Presentation of work at congresses

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  • Influence of race on impedance vector position in the R-Xc plane

     Nescolarde Selva, Lexa Digna; Rosell Ferrer, Francisco Javier; Piccoli, A; Morales, R; Román, A; Núñez, A; Lara, A
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

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  • Single-Frequency Multiple-Segment Impedance Measurements in Peritoneal Dialysis

     Nescolarde Selva, Lexa Digna; Bragos Bardia, Ramon; Riu Costa, Pere Joan; Doñate, T; Rosell Ferrer, Francisco Javier
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

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  • Medidas segmentales-monofrecuencia en pacientes sujetos a diálisis peritoneal: Análisis del vector impedancia

     Nescolarde Selva, Lexa Digna; Bogonez Franco, Francisco; Doñate, T; Riu Costa, Pere Joan; Bragos Bardia, Ramon; Rosell Ferrer, Francisco Javier
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation of work at congresses

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  • SINGLE-FREQUENCY MULTIPLE-SEGMENT IMPEDANCE MEASUREMENTS IN PERITONEAL DIALYSIS PATIENTS

     Nescolarde Selva, Lexa Digna
    International Conference on Electrical Bio-impedance
    Presentation's date: 2004-06-20
    Presentation of work at congresses

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