Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Villacorta, Humberto; Villacorta, Aline Sterque; Amador, Fernanda; Hadlich, Marcelo; Albuquerque, Denílson Campos de; Azevedo, Clerio F.

doi:10.1590/s0066-782x2012005000104

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…In HF monitoring, ICG presented hemodynamic results comparable with those obtained by cardiac magnetic resonance 13 and good correlation with invasive methods determinations (notably the Swan-Ganz catheter), with correlation coefficients between 0.76 and 0.89. 4,14…”

Section: Introductionsupporting

confidence: 59%

Hemodynamic differences among hypertensive patients with and without heart failure using impedance cardiography

Lopes

Craveiro²,

Firmino-Machado³

et al. 2019

Therapeutic Advances in Cardiovascular Disease

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Background:Impedance cardiography is a reliable, well-tolerated, and non-invasive method used to obtain hemodynamic measurements and could potentially be useful in heart failure (HF) diagnosis, hemodynamic monitoring of critically ill patients, and help in the choice of antihypertensive therapy. The objective of this study was to determine the differences between hemodynamic parameters in a study population of hypertensive patients with and without HF, using impedance cardiography.Methods:A case-control study was designed and named the TARGET study. Participants were enrolled in two study groups: control group C, hypertensive patients without HF and the HF group, hypertensive patients with HF. A descriptive analysis was carried out to characterize the sample and differences in continuous variables were tested for statistical significance by independent sample t test.Results:The study included 102 hypertensive outpatients. The control group consisted of 77 individuals (58.4% males; mean age 63.9 ± 12.5 years old) and the HF group consisted of 25 individuals (44.0% males; mean age 74.2 ± 8.7 years old). The mean Cardiac Index (CI) was 2.70 ± 1.02 L.min.m−2(2.89 ± 1.04 versus 2.12 ± 0.70; p < 0.001), mean Stroke Index (SI) was 35.5 ± 14.7 mL.m−2(37.7 ± 15.2 versus 28.5 ± 10.8; p = 0.006), mean Ejection Phase Contractility Index (EPCI) was 33.7 ± 12.7 1000 s−2(35.8 ± 13.1 versus 27.2 ± 9.2; p = 0.003), mean Inotropic State Index (ISI) was 74.3 ± 28.2 100 s−2(78.8 ± 28.9 versus 60.6 ± 20.7; p = 0.005), and mean Left Stroke Work Index (LSWI) was 51.3 ± 23.1 g.min.m−2(55.4 ± 23.5 versus 38.9 ± 16.6; p = 0.002).Conclusions:In this study, hypertensive patients with HF had significantly lower values of blood flow parameters, contractility, and left work indices compared with hypertensive patients without HF. These differences reflected the incorrect hemodynamic pattern (mostly hypodynamic) of these patients. Impedance cardiography (ICG) seems to be an adequate method to reflect these differences.

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Section: Introductionsupporting

confidence: 59%

Hemodynamic differences among hypertensive patients with and without heart failure using impedance cardiography

Lopes

Craveiro²,

Firmino-Machado³

et al. 2019

Therapeutic Advances in Cardiovascular Disease

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“…We used ICG as it is operator-independent, simple, non-invasive and ideally suited for serial measurement of changes over time [35]–[37]. Although there has been some doubt about the accuracy and applicability of this method in pregnancy [38],[39] and limitations have been highlighted [40], the hemodynamic measurements obtained using newer generation ICG machines have been validated and shown to be accurate [41],[42], reproducible, reliable and useful also in pregnant population [24],[43]–[45]. ICG has been demonstrated to have the ability to detect subtle changes in SV associated with change in maternal position [45].…”

Section: Discussionmentioning

confidence: 99%

Effect of Passive Leg Raising on Systemic Hemodynamics of Pregnant Women: A Dynamic Assessment of Maternal Cardiovascular Function at 22–24 Weeks of Gestation

2014

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ObjectiveTo investigate functional hemodynamic response to passive leg raising in healthy pregnant women and compare it with non-pregnant controls.Materials and MethodsThis was a prospective cross-sectional study with a case-control design. A total of 108 healthy pregnant women at 22–24 weeks of gestation and 54 non-pregnant women were included. Cardiac function and systemic hemodynamics were studied at baseline and 90 seconds after passive leg raising using non-invasive impedance cardiography.Main outcome measuresTrends and magnitudes of changes in impedance cardiography derived parameters of cardiac function and systemic hemodynamics caused by passive leg raising, and preload responsiveness defined as >10% increase in stroke volume or cardiac output after passive leg raising compared to baseline.ResultsThe hemodynamic parameters in both pregnant and non-pregnant women changed significantly during passive leg raising compared to baseline, but the magnitude and trend of change was similar in both groups. The stroke volume increased both in pregnant (p = 0.042) and non-pregnant (p = 0.018) women, whereas the blood pressure and systemic vascular resistance decreased (p<0.001) following passive leg raising in both groups. Only 14.8% of pregnant women and 18.5% of non-pregnant women were preload responsive and the difference between groups was not significant (p = 0.705).ConclusionStatic measures of cardiovascular status are different between healthy pregnant and non-pregnant women, but the physiological response to passive leg raising is similar and not modified by pregnancy at 22–24 weeks of gestation. Whether physiological response to passive leg raising is different in earlier and later stages of pregnancy merit further investigation.

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“…A closer look at the Bland-Altman plot provided in their analysis reveals a wide dispersion of the 95% LOA (approximately -22 to +20 ml) for SV measurements, which is in accordance with our results and indicates poor precision. In contrast, Villacorta Junior et al (2012) took into account both the bias (approximately 0.3 L•min -1 ) and the 95% LOA (approximately -1.0 to 1.4 L•min -1 ) in concluding that ICG-derived absolute CO measurement has acceptable accuracy and precision compared to CMR. Even though the findings of most of these studies (including ours) do A c c e p t e d M a n u s c r i p t not support the use of ICG as an alternative to CMR, there is still a need to investigate the performance of different ICG devices in different populations.…”

Section: Discussionmentioning

confidence: 99%

“…This was the first study to compare the performance of ICG and CMR for characterising SV, CO and EDV in breast cancer patients. Five previous studies have examined the performance of ICG in comparison to CMR in other populations: paediatric patients (either with or without cardiac disease) (Taylor et al, 2012), adult healthy participants (Borzage et al, 2017), adult patients referred for a CMR scan (Villacorta Junior et al, 2012), adult and paediatric patients with congenital heart disease (Ebrahim et al, 2016) and adult patients suspected of suffering from pulmonary arterial hypertension (Panagiotou et al, 2018). Our findings of poor precision are in accordance with those reported by Taylor et al (2012) and Borzage et al (2017), with ICG showing either an over-or under-estimation of both CI (cardiac index, equal to CO divided by body surface area) and SV of up to 73% and 92%, respectively, compared to CMR.…”

Section: Discussionmentioning

confidence: 99%

“…One such method might be thoracic electrical bioimpedance (or impedance cardiography, ICG), a technique that noninvasively estimates cardiac volume changes on a beat-to-beat basis (Fortin et al, 2006). ICG has been compared with CMR in paediatric patients (with and without cardiac disease; Taylor et al, 2012), in healthy adult participants (Borzage et al, 2017), in adult patients referred for a CMR scan (Villacorta Junior et al, 2012), in adult and paediatric patients with congenital heart disease (Ebrahim et al, 2016) and in adult patients suspected of suffering from pulmonary arterial hypertension (Panagiotou et al, 2018). The findings from these studies have been inconsistent, but most authors have shown a poor agreement between the two modalities in terms of two of their commonly derived variables: stroke volume (SV) and cardiac output (CO).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of impedance cardiography and cardiac magnetic resonance imaging for the evaluation of cardiac function in early-stage breast cancer patients

Piastopoulou¹,

Ali²,

Bertelli³

et al. 2021

Physiol. Meas.

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Objective. Breast cancer treatment can negatively impact cardiac function in some breast cancer patients. Current methods (MUGA, echocardiography) used in clinical practice to detect abnormal cardiac changes as a result of treatment suffer from important limitations. Use of alternative techniques that would offer safe, inexpensive and non-invasive cardiac function assessment in this population would be highly advantageous. The aim of this study was to examine the agreement between impedance cardiography (ICG) and cardiac magnetic resonance imaging (CMR) in quantifying stroke volume (SV), cardiac output (CO) and end-diastolic volume (EDV) in this population. Approach. Sixteen breast cancer patients underwent ICG and CMR assessments at three time-points (before treatment, immediately after chemotherapy, and four months after chemotherapy). Bland–Altman analysis was used to quantify the accuracy and precision of ICG (relative to CMR) in estimating absolute values of SV, CO and EDV. Four methods (concordance rate, polar concordance rate, clinical concordance rate and trend interchangeability rate) were also used to assess ICG performance in tracking changes in these variables. Main results. Bland–Altman analysis showed that the accuracy of ICG relative to CMR was −3.1 ml (SV), 0.2 l·min−1 (CO) and −26.0 ml (EDV) and precision was 13.2 ml (SV), 1.1 l·min−1 (CO) and 20.1 ml (EDV), respectively. Trending ability assessment showed that (1) the concordance rate was 87% (SV), 73% (CO) and 73% (EDV), (2) the polar concordance rate was 67% (SV), 53% (CO) and 33% (EDV), (3) the clinical concordance rate was 33% (SV), 40% (CO) and 20% (EDV) and (4) the trend interchangeability rate was 29% (SV), 43% (CO) and 17% (EDV), respectively. Significance. Our findings show that, although ICG showed good accuracy for absolute SV and CO measurements and for CO and EDV changes, precision was poor for all variables in terms of both absolute measurements and trend tracking performance. This suggests that ICG cannot be used interchangeably with CMR in breast cancer patients.

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Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Cited by 6 publications

References 15 publications

Hemodynamic differences among hypertensive patients with and without heart failure using impedance cardiography

Hemodynamic differences among hypertensive patients with and without heart failure using impedance cardiography

Effect of Passive Leg Raising on Systemic Hemodynamics of Pregnant Women: A Dynamic Assessment of Maternal Cardiovascular Function at 22–24 Weeks of Gestation

Comparison of impedance cardiography and cardiac magnetic resonance imaging for the evaluation of cardiac function in early-stage breast cancer patients

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