Comparison of bioimpedance and radioisotope methods in the estimation of extracellular water volume before and after coronary artery bypass grafting operation

Kööbi, Tiit; Kähönen, Mika; Koskinen, Matti; Kaukinen, S.; Turjanmaa, Väinö

doi:10.1046/j.1365-2281.2000.00261.x

Cited by 18 publications

(10 citation statements)

References 29 publications

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“…PWV values obtained using this equation correlate well with values measured with Doppler ultrasound or applanation tonometry [32,33]. Whole-body bioimpedance-derived ECW correlates well with 51 Cr-EDTA dilution-based measurement of ECW (r ¼ 0.74, bias 0.2 ± 1.1 litres), as well as with perioperative weight changes of patients [34]. The repeatability and reproducibility of this measurement protocol has been previously established [32,35,36].…”

Section: Whole-body Impedance Cardiographysupporting

confidence: 56%

Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects

et al. 2019

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2020) Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects, Blood Pressure, 29:3, 137-148, ABSTRACT Purpose: The underlying causes of primary hypertension are not fully understood. Evidence on the relation of plasma calcium concentration with blood pressure (BP) is inconsistent and relies largely on studies utilizing office BP measurements in populations using cardiovascular drugs. In many studies adjustment for confounders was not optimal. In this cross-sectional study we examined the association of plasma total calcium concentration with the haemodynamic determinants of blood pressure. Subjects and methods: Supine haemodynamics were recorded using pulse wave analysis, whole-body impedance cardiography, and heart rate variability analysis in 618 normotensive or never-treated hypertensive subjects (aged 19-72 years) without diabetes, cardiovascular or renal disease, or cardiovascular medications. Linear regression analysis was used to investigate factors associated with haemodynamic variables. Results: Mean age was 45.0 years, body mass index 26.8 kg/m 2 , seated office BP 141/89 mmHg, and 307 subjects (49.7%) were male. Mean values of routine blood and plasma chemistry analyses were within the reference limits of the tests except for low-density lipoprotein cholesterol (3.05 mmol/l). In the laboratory, mean supine radial BP was 131/75 mmHg, and both systolic and diastolic BP correlated directly with plasma total calcium concentration (r ¼ 0.25 and r ¼ 0.22, respectively, p < 0.001 for both). In regression analysis plasma total calcium concentration was an independent explanatory variable for radial and aortic systolic and diastolic BP, and systemic vascular resistance, but not for cardiac output, pulse wave velocity, or any of the heart rate variability parameters. Conclusion: Plasma total calcium concentration was directly associated with systolic and diastolic BP and systemic vascular resistance in normotensive or never-treated hypertensive subjects without comorbidities and cardiovascular medications. Higher plasma calcium concentration potentially plays a role in primary hypertension via an effect on vascular resistance. ARTICLE HISTORY

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Section: Whole-body Impedance Cardiographysupporting

confidence: 56%

Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects

et al. 2019

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“…The CircMon ® evaluates ECW volume by the formula ECW = k*(H 2 /Z), coefficient k (Ω*cm) derived from blood resistivity and the relation between the distance of voltage electrodes, H is body height (cm), and Z is the recorded impedance of the body. The bioimpedance‐derived ECW volume correlates well with 51 Cr‐EDTA dilution‐based ECW measurement ( n = 15, r = 0.74, bias 0.2 ± 1.1 L, mea n ± SD) [27]. The ECW balance is calculated as ECW/ECW predicted .…”

Section: Whole‐body Impedance Cardiographymentioning

confidence: 99%

Primary aldosteronism: Higher volume load, cardiac output and arterial stiffness than in essential hypertension

et al. 2020

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Background. The diagnostics of primary aldosteronism (PA) are usually carried out in patients taking antihypertensive medications. We compared haemodynamics between medicated PA, medicated essential hypertension (EH), never-medicated EH and normotensive controls (n = 130 in all groups). Methods. The hypertensive groups were matched for age (53 years), sex (84 male/46 female) and body mass index (BMI) (30 kg m À2); normotensive controls had similar sex distribution (age 48 years, BMI 27 kg m À2). Haemodynamics were recorded using whole-body impedance cardiography and radial pulse wave analysis, and the results were adjusted as appropriate. Radial blood pressure recordings were calibrated by brachial blood pressure measurements from the contralateral arm. Results. Radial and aortic systolic and diastolic blood pressure was similar in PA and never-medicated EH, and higher than in medicated EH and normotensive controls (P ≤ 0.001 for all comparisons). Extracellular water balance was~4% higher in PA than in all other groups (P < 0.05 for all), whilst cardiac output was~8% higher in PA than in medicated EH (P = 0.012). Systemic vascular resistance and augmentation index were similarly increased in PA and both EH groups when compared with controls. Pulse wave velocity was higher in PA and never-medicated EH than in medicated EH and normotensive controls (P ≤ 0.033 for all comparisons). Conclusions. Medicated PA patients presented with corresponding systemic vascular resistance and wave reflection, but higher extracellular water volume, cardiac output and arterial stiffness than medicated EH patients. Whether the systematic evaluation of these features would benefit the clinical diagnostics of PA remains to be studied in future.

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“…as the left ventricle contracts and blood flows into the thoracic aorta. Bio-impedance measures the changes in amplitude of the voltage change across the thorax [97]. Both positive and negative studies have been published, with some suggesting bio-impedance to be a useful non-invasive method to assess extracellular volume changes in patients undergoing cardiac surgery, with a close relationship with thermodilution [98,99], while others reported a negative correlation between the accuracy of bio-impedance and increased fluid accumulation within the thorax [100][101][102].…”

Section: Bio-impedance and Bio-reactancementioning

confidence: 99%

“…In contrast to the bio-impedance method, studies showed a good relationship between CO determined by bio-reactance and minimally invasive methods or thermodilution method [103][104][105]. Bio-reactance can be an accurate method to assess fluid responsiveness in critically ill patients and in patients undergoing major abdominal-pelvic surgery [97,[103][104][105]. Nevertheless, measurement of CO and other parameters can be disturbed by changes in tissue oedema, pleural effusions, arrhythmias, electrical interference, pacemakers or motion [105,106].…”

Section: Bio-impedance and Bio-reactancementioning

confidence: 99%

Contemporary perioperative haemodynamic monitoring

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Hendrickx

Liu

et al. 2019

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Comparison of bioimpedance and radioisotope methods in the estimation of extracellular water volume before and after coronary artery bypass grafting operation

Cited by 18 publications

References 29 publications

Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects

Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects

Primary aldosteronism: Higher volume load, cardiac output and arterial stiffness than in essential hypertension

Contemporary perioperative haemodynamic monitoring

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