Non-invasive measurement of cardiac output: whole-body impedance cardiography in simultaneous comparison with thermodilution and direct oxygen Fick methods

Kööbi, Tiit; Kaukinen, S.; Ahola, T; Turjanmaa, Väinö

doi:10.1007/s001340050469

Cited by 88 publications

(94 citation statements)

References 28 publications

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“…Whole-body impedance cardiography (CircMon R , JR Medical Ltd., Tallinn, Estonia), based on the changes in electrical impedance of the body during cardiac cycle, was used to determine beat-to beat heart rate, stroke volume, cardiac index, extracellular volume, and pulse wave velocity (PWV) [16]. Systemic vascular resistance index was calculated from radial blood pressure and cardiac index [17].…”

Section: Methodsmentioning

confidence: 99%

Daily Liquorice Consumption for Two Weeks Increases Augmentation Index and Central Systolic and Diastolic Blood Pressure

et al. 2014

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BackgroundLiquorice ingestion often elevates blood pressure, but the detailed haemodynamic alterations are unknown. We studied haemodynamic changes induced by liquorice consumption in 20 subjects versus 30 controls with average blood pressures of 120/68 and 116/64 mmHg, respectively.MethodsHaemodynamic variables were measured in supine position before and after two weeks of liquorice consumption (daily glycyrrhizin dose 290–370 mg) with tonometric recording of radial blood pressure, pulse wave analysis, and whole-body impedance cardiography. Thirty age-matched healthy subjects maintaining their normal diet were studied as controls.ResultsTwo weeks of liquorice ingestion elevated peripheral and central systolic and diastolic blood pressure (by 7/4 and 8/4 mmHg, 95% confidence intervals [CI] 2-11/1-8 and 3-13/1-8, respectively, P<0.05), and increased extracellular volume by 0.5 litres (P<0.05 versus controls). Also augmentation index adjusted to heart rate 75/min (from 7% to 11%, 95% CI for change 0.3-7.5, P<0.05) and aortic pulse pressure (by 4 mmHg, 95% CI 1-7, P<0.05) were elevated indicating increased wave reflection from the periphery. In contrast, peripheral (−3/−0.3 mmHg) and central blood pressure (−2/−0.5 mmHg), aortic pulse pressure (−1 mmHg), and augmentation index adjusted to heart rate 75/min (from 9% to 7%) decreased numerically but not statistically significantly without changes in extracellular volume in the control group. Heart rate, systemic vascular resistance, cardiac output, and pulse wave velocity did not differ between the groups.ConclusionsTwo weeks of daily liquorice consumption increased extracellular volume, amplified pressure wave reflection from the periphery, and elevated central systolic and diastolic blood pressure.Trial RegistrationEU Clinical Trials Register EudraCT 2006-002065-39ClinicalTrials.gov NCT01742702

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Section: Methodsmentioning

confidence: 99%

Daily Liquorice Consumption for Two Weeks Increases Augmentation Index and Central Systolic and Diastolic Blood Pressure

et al. 2014

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“…Comparison with thermodilution (TD) and direct Fick methods showed that ICG WB measures CO accurately in different conditions (in the supine position, during head-up tilt, after the induction of anesthesia and after coronary artery bypass surgery) (14,27,28). The differences in CO values between ICG WB and TD were comparable with those attained between direct Fick and TD, and the repeatability of ICG WB was nearly twice as good as in TD (27,28). Therefore, ICG WB is an adequate method to estimate CO and its changes.…”

Section: Discussionmentioning

confidence: 99%

The Comparison of Hypertonic Saline (7.5%) and Normal Saline (0.9%) for Initial Fluid Administration Before Spinal Anesthesia

Järvelä

Honkonen²,

Järvelä³

et al. 2000

Anesthesia & Analgesia

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Hypertonic saline can be used for initial fluid administration before spinal anesthesia. It is effective in smallvolume fluid resuscitation. This randomized doubleblinded study compared the effects of 7.5% hypertonic saline (HS) and 0.9% normal saline (NS) in doses containing 2 mmol/kg of sodium in 40 ASA physical status I-II patients undergoing arthroscopy or other lower limb surgery under spinal anesthesia. We infused 1.6 mL/kg of HS or 13 mL/kg of NS for initial fluid administration before spinal anesthesia induced with a 10-mg dose of 0.5% hyperbaric bupivacaine. Etilefrine was administered to maintain mean arterial pressure at Ն80% of its control value. Systolic and diastolic blood pressure, heart rate, and cardiac index did not differ between the groups, and the amount of etilefrine administered was similar in the treatment groups. In all our patients, the plasma sodium concentrations were within the normal range after surgery and serum osmolality was within the normal range after spinal anesthesia. The time and the volume of the first micturition were similar in both groups, despite the much smaller amount of infused free water in the HS group. We conclude that 7.5% HS was as good as NS for the initial fluid administration before spinal anesthesia when the amount of sodium was kept unchanged.

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“…The bias and limits of agreement between thermodilution and ICG WB were 0.00 l/min ± 1.37 l/min and between the Fick method and ICG WB were −0.32 l/min ± 1.92 l/min, respectively. The repeatability value for ICG WB was excellent (0.57 l/min) (26).…”

Section: Methodsmentioning

confidence: 98%

Hemodynamic Adaptation during Pregnancy in Chronic Hypertension

Tihtonen

Kööbi

Huhtala

et al. 2007

Hypertension in Pregnancy

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Non-invasive measurement of cardiac output: whole-body impedance cardiography in simultaneous comparison with thermodilution and direct oxygen Fick methods

Cited by 88 publications

References 28 publications

Daily Liquorice Consumption for Two Weeks Increases Augmentation Index and Central Systolic and Diastolic Blood Pressure

Daily Liquorice Consumption for Two Weeks Increases Augmentation Index and Central Systolic and Diastolic Blood Pressure

The Comparison of Hypertonic Saline (7.5%) and Normal Saline (0.9%) for Initial Fluid Administration Before Spinal Anesthesia

Hemodynamic Adaptation during Pregnancy in Chronic Hypertension

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