Reference values of the bioelectrical impedance vector in neonates in the first week after birth

Piccoli, Antônio; Fanos, Vassilios; Peruzzi, Licia; Schena, S.; Pizzini, Cláudia Vera; Borgione, Silvia Maria; Bertino, Enrico; Chiaffoni, Gian Paolo; Coppo, Rosanna; Tatò, Luciano

doi:10.1016/s0899-9007(02)00795-5

Cited by 40 publications

(60 citation statements)

References 18 publications

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“…Os dados de alimentação demonstram que há uma predominância da amamentação exclusiva no grupo < 7d, enquanto no grupo ≥ 7d predomina a amamentação continuada. Na Tabela 2, estão apresentados os dados obtidos no momento da aferição da BIA, tais como peso, comprimento, Índice de Massa Corporal (IMC), R, Xc, R/H e Xc/H e AF, do presente estudo (< 7d e ≥ 7d) e comparados com os estudos de Piccoli et al 4 e de Margutti et al 13 . No momento da avaliação da BIA, os RNs < 7d apresentaram média de idade de 2,56 ± 1,35 dias; de peso, 2228,32 ± 464,68 gramas; e de comprimento 0,45 ± 0,024 metros.…”

Section: Resultsunclassified

“…Já os RNs ≥ 7d apresentaram média de 14,70 ± 7,22 dias, 1775,32 ± 370,35 gramas e 0,42 ± 0,028 metros, respectivamente para idade, peso e comprimento. Valores médios de R e Xc corrigidos pelo comprimento de RNs pré-termo < 7d ou ≥ 7d são aparentemente maiores no presente estudo, em comparação aos estudos de Piccoli et al 4 e de Margutti et al 13 .…”

Section: Resultsunclassified

“…As mudanças de peso corporal em recém-nascidos (RNs) são de difícil interpretação, pois podem representar alterações tanto no tecido adiposo quanto no muscular ou na sua hidratação 4 . Sendo assim, não se pode considerar a hidratação constante da MLG, e julga-se inadequado o método convencional de BIA 5 .…”

Section: Introductionunclassified

“…Foram utilizadas duas populações de referência (RNs a termo) para pontear os dados no plano RXc: RNs saudáveis menores de 7 dias (< 7d) 4 e RNs maiores ou igual a 7 dias de vida (≥ 7d) 13 .…”

Section: Introductionunclassified

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Bioelectrical impedance vector analysis (BIVA) in stable preterm newborns

Margutti¹,

Bustamante²,

Sanches³

et al. 2012

J Pediatr (Rio J)

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Objective: To observe the behavior of the plotted vectors on the RXc (R -resistance -and Xc -reactance corrected for body height/ length) graph through bioelectrical impedance analysis (BIVA) and phase angle (PA) values in stable premature infants, considering the hypothesis that preterm infants present vector behavior on BIVA suggestive of less total body water and soft tissues, compared to reference data for term infants.Methods: Cross-sectional study, including preterm neonates of both genders, in-patients admitted to an intermediate care unit at a tertiary care hospital. Data on delivery, diet and bioelectrical impedance (800 mA, 50 kHz) were collected. The graphs and vector analysis were performed with the BIVA software.Results: A total of 108 preterm infants were studied, separated according to age (< 7 days and ≥ 7 days). Most of the premature babies were without the normal range (above the 95% tolerance intervals) existing in literature for term newborn infants and there was a tendency to dispersion of the points in the upper right quadrant, RXc plan. The PA was 4.92° (±2.18) for newborns < 7 days and 4.34° (±2.37) for newborns ≥ 7 days. Conclusion:Premature infants behave similarly in terms of BIVA and most of them have less absolute body water, presenting less fat free mass and fat mass in absolute values, compared to term newborn infants.J Pediatr (Rio J). 2012;88(3):253-8: Premature infant, newborn infant, electrical impedance, body composition. ResumoObjetivo: Observar o comportamento dos vetores ponteados no gráfico de resistência e de reactância corrigidos pelo comprimento corporal (RXc) através da análise vetorial de impedância bioelétrica (BIVA) e os valores de ângulo de fase (AF) em recém-nascidos (RNs) pré-termo estáveis, considerando a hipótese que o RN pré-termo apresenta o seu comportamento vetorial na BIVA sugestivo de menor quantidade de água e de tecidos moles corporais, comparativamente à referência do RN a termo.Métodos: Foi realizado estudo de corte transversal em RNs pré-termo, de ambos os sexos, que se encontravam em uma unidade de cuidados intermediários de um hospital terciário. Coletaram-se dados relacionados ao nascimento e à alimentação, bem como dados de bioimpedância elétrica (800 mA, 50 kHz). Os gráficos e as análises vetoriais foram realizados através do BIVA software.Resultados: Um total de 108 RNs pré-termo foram estudados, separados por faixa etária (< 7 dias e ≥ 7 dias). A maioria dos RNs pré-termo encontrou-se fora da normalidade (acima dos intervalos de tolerância de 95%) existentes na literatura para RNs a termo, e observou-se uma tendência para a dispersão dos pontos no quadrante superior direito no gráfico RXc. O AF dos RNs < 7 dias foi de 4,92° (±2,18), e a dos RNs ≥ 7 dias, de 4,34° (±2,37). Conclusão:Os RNs pré-termo se comportam de maneira semelhante entre si. A maioria deles possui menor quantidade absoluta de água corporal e apresenta menor quantidade tanto de massa livre de gordura quanto de massa gorda, em valores absolutos, quando comparados com os...

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Section: Resultsunclassified

Section: Introductionunclassified

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Bioelectrical impedance vector analysis (BIVA) in stable preterm newborns

Margutti¹,

Bustamante²,

Sanches³

et al. 2012

J Pediatr (Rio J)

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“…Healthy subjects are usually positioned within the 75% tolerance ellipse [25]. The BIVA can be used for routine monitoring of the variation in body fluids, nutritional status of individuals, and for representing a clinically useful procedure [26].…”

Section: Bioelectrical Impedance Vector Analysis (Biva)mentioning

confidence: 99%

Bioelectrical Impedance Analysis on the Paretic and Non-paretic Regions of Severe and Mild Hemiplegic Stroke Patients

Chanuk¹,

Yang²,

Baik³

et al. 2017

Journal of Korea Multimedia Society

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For many stroke patients undergoing rehabilitation therapy, there is a need for indicator for evaluating the body function in paretic and non-paretic regions of stroke patients quantitatively. In this paper, the function of muscles and cells in paretic and non-paretic regions of severe and mild hemiplegic stroke patients was evaluated using multi-channel bioelectrical impedance spectroscopy. The paretic and non-paretic regions of severe and mild stroke patients were quantitatively assessed by using bioelectrical impedance parameters such as prediction marker (PM), phase angle (θ), characteristic frequency (f c ), and bioelectrical impedance vector analysis (BIVA). The mean values of impedance vector were significantly discriminated in all comparisons (severe-paretic, severe-non-paretic, mild-paretic, and mild-non-paretic). The bioelectrical impedance parameters were proved to be a very valuable tool for quantitatively evaluating the paretic and non-paretic regions of hemiplegic stroke patients.

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Bioelectrical impedance vector values in a Spanish healthy newborn population for nutritional assessment

Redondo‐del‐Río

Escribano‐García

Camina‐Martín

et al. 2019

American J Hum Biol

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Introduction Vector bioimpedance analysis (BIVA) can be very useful for the evaluation of body composition, hydration, and nutritional status in infants and newborns. The objective of this study was to determine the impedance vector distribution for a group of healthy newborn Spanish children. Methods This was a cross‐sectional, descriptive study conducted with 154 healthy, Spanish newborns (gestational age: 37‐41 weeks) aged 24 to 72 hours (79 males, 75 females). Weight, height, and cephalic‐circumference were determined. Resistance and reactance were measured with a single‐frequency impedance analyzer at 50 kHz (tetrapolar analysis). The newborns' specific 95% confidence intervals of the mean vectors and the 95%, 75%, and 50% tolerance intervals for the individual vector measurements were plotted using R and Xc components standardized by the subjects' lengths. The mean impedance vectors were compared with Hotelling's‐T2 test for vector analysis (significance level: P < .05). Results The newborns exhibited gender‐related differences in the mean impedance vector (mean [SD] R/H: 833.6 [97.5] Ohm/m in males vs 918.2 [107.7] Ohm/m in females; mean [SD] Xc/H: 91.3 [34.7] Ohm/m in males vs 95.6 [23.2] Ohm/m in females). No statistically significant differences in the mean impedance vectors were observed according to days of life. Lower values of resistance and slightly higher reactance values were observed in the healthy Spanish newborns compared to Italian newborns. Conclusions New tolerance ellipses were constructed for healthy Spanish newborns. These data allow detecting alterations in the hydration status and cell mass in term newborns in the first 3 days of life.

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Reference values of the bioelectrical impedance vector in neonates in the first week after birth

Cited by 40 publications

References 18 publications

Bioelectrical impedance vector analysis (BIVA) in stable preterm newborns

Bioelectrical impedance vector analysis (BIVA) in stable preterm newborns

Bioelectrical Impedance Analysis on the Paretic and Non-paretic Regions of Severe and Mild Hemiplegic Stroke Patients

Bioelectrical impedance vector values in a Spanish healthy newborn population for nutritional assessment

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