Transthoracic Impedance Cardiography: A Noninvasive Method of Hemodynamic Assessment

Bayram, Melike; Yancy, Clyde W.

doi:10.1016/j.hfc.2008.12.001

Cited by 27 publications

(16 citation statements)

References 42 publications

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“…18 Additionally, both of these measures were validated in prior studies. 30,31 Inflammatory Biomarkers. The inflammatory cytokines (IL-1, IL-6, TNF-a, and CRP) were treated as independent variables to ascertain inflammatory process.…”

Section: Variables ⁄ Instruments and Data Collectionmentioning

confidence: 99%

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Elevated Levels of Interleukin 6 and C‐Reactive Protein Associated With Cognitive Impairment in Heart Failure

Athilingam

Moynihan

Chen

et al. 2012

Congestive Heart Failure

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There is abundant evidence on inflammatory mechanisms in heart failure (HF) that are used for prognostication of the disease; however, data are lacking regarding the association between elevated cytokines, C-reactive protein (CRP), and cognition in HF. A cross-sectional pilot study of 38 patients with HF, aged 62 years (standard deviation± 9 years), predominantly men (68%) and Cau casian (79%) were screened for cognitive function using the Montreal Cognitive Assessment (MoCA). The study aimed to examine cognitive scores on MoCA with cytokines, interleukin 6 [IL-6] and tumor necrosis factor α [TNF-α], and CRP as indicators of early cognitive changes in HF. The result showed no direct correlation between cardiac variables and the MoCA score. The MoCA score, however, was inversely associated with IL-6 (r=−0.53, P=.001) and CRP (r=−0.34, P=.04), with no association to TNF-α. Regression analysis on the MoCA score and log-transformed IL-6 accounted for an additional 11% variation and remained statistically significant (P=.008) after controlling for covariates of education, living arrangements, and loneliness. The large effect size (R2=0.87) found in this pilot study provides rationale for a larger exploratory study to examine associations between cognitive function, cytokines, and CRP levels and help design future intervention studies.

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Section: Variables ⁄ Instruments and Data Collectionmentioning

confidence: 99%

“…Our primary correlational study of 90 HF patients compared cardiac output and cardiac index measured by thermodilution during cardiac catheterization and ICG in a subgroup of participants (n=12) with a strong correlation among both the measures ( r =0.830, P =.011) 18 . Additionally, both of these measures were validated in prior studies 30,31 …”

mentioning

confidence: 92%

Elevated Levels of Interleukin 6 and C‐Reactive Protein Associated With Cognitive Impairment in Heart Failure

Athilingam

Moynihan

Chen

et al. 2012

Congestive Heart Failure

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“…4,5 Fluid assessment using electrical impedance measurement has been used for more than 4 decades, 6,7 based on fundamental work done in the early and mid-1900s. [8][9][10] However, despite the reliability of bioimpedance, 11 this technology has remained underutilized, presumably due to the lack of noninvasive, simple ambulatory measurement devices. 12,13 In this study we evaluated the performance of a novel, nonin-vasive, ambulatory, monitoring system for accurately assessing fluid removal during two hemodialysis sessions.…”

mentioning

confidence: 99%

Monitoring Changes in Fluid Status With a Wireless Multisensor Monitor: Results From the Fluid Removal During Adherent Renal Monitoring (FARM) Study

Anand

Doan²,

et al. 2011

Congestive Heart Failure

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Body fluid assessment is important for managing chronic kidney disease (CKD) and heart failure (HF). However, accurate detection of fluid retention remains elusive. The Fluid Removal During Adherent Renal Monitoring (FARM) study is a prospective, nonrandomized trial examining the performance of a wireless, noninvasive, multisensor fluid monitoring system, applied to the chest, to determine its performance and reliability during hemodialysis. Patients undergoing regular hemodialysis (n=25) were monitored continuously for 2 consecutive dialysis sessions and the interdialysis period. Physiologic variables, including tissue impedance, were recorded. The volume of fluid removed and weight change during dialysis were measured. An average of 3.4±1.2 L of fluid was removed during dialysis, which was associated with an increase in bioimpedance of 11.3±7.2 Ω. Change in bioimpedance was highly correlated with the amount of fluid removed but less so with weight loss. Normalized bioimpedance change (21.0%±12.1% increase from baseline, P<001) was larger than the normalized weight change (3.6%±1.1%, P<.01), suggesting a higher sensitivity and dynamic range than weight change for detecting fluid removal. The fluid monitoring system accurately tracked fluid and weight loss in patients during hemodialysis, supporting its use as a tool for the management of patient fluid status in disease states. Congest Heart Fail. 2012;18:32–36. ©2011 Wiley Periodicals, Inc.

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“…Monitoring of hemodynamic parameters was performed through a non-invasive method, validated in previous studies. 27 …”

Section: Discussionmentioning

confidence: 99%

Reduced Systolic Volume: Main Pathophysiological Mechanism in Patients with Orthostatic Intolerance?

Távora-Mehta¹,

Mehta²,

Magajevski³

et al. 2016

Arquivos Brasileiros De Cardiologia

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BackgroundOrthostatic intolerance patients' pathophysiological mechanism is still obscure, contributing to the difficulty in their clinical management.ObjectiveTo investigate hemodynamic changes during tilt test in individuals with orthostatic intolerance symptoms, including syncope or near syncope.MethodsSixty-one patients who underwent tilt test at - 70° in the phase without vasodilators were divided into two groups. For data analysis, only the first 20 minutes of tilting were considered. Group I was made up of 33 patients who had an increase of total peripheral vascular resistance (TPVR) during orthostatic position; and Group II was made up of 28 patients with a decrease in TPVR (characterizing insufficient peripheral vascular resistance). The control group consisted of 24 healthy asymptomatic individuals. Hemodynamic parameters were obtained by a non-invasive hemodynamic monitor in three different moments (supine position, tilt 10' and tilt 20') adjusted for age.ResultsIn the supine position, systolic volume (SV) was significantly reduced in both Group II and I in comparison to the control group, respectively (66.4 ±14.9 ml vs. 81.8±14.8 ml vs. 101.5±24.2 ml; p<0.05). TPVR, however, was higher in Group II in comparison to Group I and controls, respectively (1750.5± 442 dyne.s/cm5 vs.1424±404 dyne.s/cm5 vs. 974.4±230 dyne.s/cm5; p<0.05). In the orthostatic position, at 10', there was repetition of findings, with lower absolute values of SV compared to controls (64.1±14.0 ml vs 65.5±11.3 ml vs 82.8±15.6 ml; p<0.05). TPVR, on the other hand, showed a relative drop in Group II, in comparison to Group I.ConclusionReduced SV was consistently observed in the groups of patients with orthostatic intolerance in comparison to the control group. Two different responses to tilt test were observed: one group with elevated TPVR and another with a relative drop in TPVR, possibly suggesting a more severe failure of compensation mechanisms.

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Transthoracic Impedance Cardiography: A Noninvasive Method of Hemodynamic Assessment

Cited by 27 publications

References 42 publications

Elevated Levels of Interleukin 6 and C‐Reactive Protein Associated With Cognitive Impairment in Heart Failure

Elevated Levels of Interleukin 6 and C‐Reactive Protein Associated With Cognitive Impairment in Heart Failure

Monitoring Changes in Fluid Status With a Wireless Multisensor Monitor: Results From the Fluid Removal During Adherent Renal Monitoring (FARM) Study

Reduced Systolic Volume: Main Pathophysiological Mechanism in Patients with Orthostatic Intolerance?

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