Impedance Cardiography as a Noninvasive Method of Monitoring Cardiac Function and Other Parameters of the Cardiovascular System*

Kubicek, W. G.; Patterson, Robert; Witsoe, D. A.

doi:10.1111/j.1749-6632.1970.tb17735.x

Cited by 372 publications

(216 citation statements)

References 3 publications

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“…Impedance cardiology was used (Minnesota Impedance Cardiograph, Model 304B: Instrumentation for Medicine, Greenwich, CN, USA) to estimate stroke volume (SV) using the formula proposed by Kubicek et al, 17 and an electrocardiogram (Amlab Physiograph) was used to measure heart rate (HR). Blood pressure (BP) was monitored continuously on a beat-to-beat basis by a Finapres (Model Ohmeda 2300: Ohmeda, Madison, WI, USA).…”

Section: Methodsmentioning

confidence: 99%

Cardiovascular and renal responses to mental challenge in highly and moderately active males with a family history of hypertension

Hamer

Boutcher

2002

J Hum Hypertens

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The objective of this study was to compare FBF and renal responses to mental challenge in highly and moderately active males with a family history of hypertension. Normotensive, healthy males with a family history of hypertension (n = 18) were recruited into moderately active and highly active groups. Cardiovascular, FBF, and renal responses to a 10-min Stroop mental challenge were measured. Urine was analysed for levels of sodium and potassium pre and post stressor as an indicant of renal blood flow. The results were that the moderately active males demonstrated a significantly higher level of FBF reactivity to mental challenge compared with that of the highly active. Heart rate change and FBF

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Section: Methodsmentioning

confidence: 99%

Cardiovascular and renal responses to mental challenge in highly and moderately active males with a family history of hypertension

Hamer

Boutcher

2002

J Hum Hypertens

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“…The first derivative of the impedance change (associated with ventricular contraction) was used to calculate stroke volume, using the Kubicek equation. [24][25][26] TPR was calculated in TPR units by dividing mean arterial BP by cardiac output. Arm regional vascular resistance (AVR) was calculated per 100 ml tissue/min in PRU units.…”

Section: Methodsmentioning

confidence: 99%

Postexercise decrease in arterial blood pressure, total peripheral resistance and in circulatory responses to brief hyperoxia in subjects with mild essential hypertension

et al. 1998

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The objective of our study was: (1) to compare the influence of moderate exercise on circulatory afterresponse in mildly hypertensive (n = 8) and normotensive male subjects (n = 9); (2) to examine the circulatory response to 3-min hyperoxic inactivation of arterial chemoreceptors at rest and during postexercise period in both groups. Hypertensive men (HTS) with a systolic blood pressure (SBP) 148 ؎ 5 mm Hg, diastolic blood pressure (DBP) 92.4 ؎ 4 mm Hg; and normotensive men (NTS), with a SBP 126 ؎ 3 mm Hg, DBP 75.6 ؎ 1.3 mm Hg, were submitted to 20-min of moderate exercise on a cycloergometer (up to the level of 55% of each subject's resting heart rate reserve). Finger arterial BP was recorded continuously with Finapres, impedance reography was used for recording stroke volume, cardiac output and arm blood flow. In HTS a significant decrease in SBP by 14.5 ؎ 3.4 mm Hg, DBP by 8.9 ؎ 1.9

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“…BI signals are recorded first in the chest and then in the thigh with two pairs of surface ECG electrodes attached to a four-electrode impedance device (PhysioFlow PF-05 Lab1, Manatec Laboratories, Paris, France). 20,21 For example, a very low electrical current at high frequency (3.8 mA, 75 kHz) was administered through the first pair of electrodes at the chest wall (electrodes 1 and 4), and the differential electrical potential was recorded by the second pair (electrodes 2 and 3) (see refs. [22][23][24][25].…”

Section: Regional Aostiff Measurementsmentioning

confidence: 99%

Assessment of aortic stiffness by local and regional methods

et al. 2011

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The stiffness of large arteries has an important role in cardiovascular hemodynamics. Aortic stiffness (AoStiff) can be assessed non-invasively with regional and local methods. In this paper, we compared these two techniques for evaluating AoStiff. Our subjects comprised of 118 consecutive patients (85 men, mean age: 49 ± 14 years). We evaluated regional AoStiff with carotid-femoral pulse wave velocity (PWV) measured with a tonometric technique and by bioelectrical impedance (BI) wave velocity (IWV). The local AoStiff was calculated from BI signals recorded at the chest. We used glyceryl trinitrate (GTN) to test the effect of peripheral vasodilatation on both methods in a subgroup of 52 patients (37 men, mean age: 52 ± 11 years). We found a significant correlation between IWV and PWV measurements (r¼0.88, Po0.0001) as well as between AoStiff and PWV measurements (r¼0.75, Po0.0001). GTN administration decreased mean arterial blood pressure by 4% (95% confidence interval: 2-8%, P¼0.002) without significant changes in AoStiff and regional IWV. Local AoStiff is correlated with regional measurements and is not influenced by changes in arterial pressure because of systemic peripheral vasodilatation.

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Impedance Cardiography as a Noninvasive Method of Monitoring Cardiac Function and Other Parameters of the Cardiovascular System*

Cited by 372 publications

References 3 publications

Cardiovascular and renal responses to mental challenge in highly and moderately active males with a family history of hypertension

Cardiovascular and renal responses to mental challenge in highly and moderately active males with a family history of hypertension

Postexercise decrease in arterial blood pressure, total peripheral resistance and in circulatory responses to brief hyperoxia in subjects with mild essential hypertension

Assessment of aortic stiffness by local and regional methods

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