Comparing impedance cardiography and echocardiography in the assessment of reduced left ventricular systolic function

Kaszuba, Elzbieta; Scheel, Sergej; Odeberg, Håkan; Halling, Anders

doi:10.1186/1756-0500-6-114

Cited by 13 publications

(13 citation statements)

References 22 publications

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“…We found correlations between EF and STR and PEP (other studies yielded similar results [ 7 , 8 ]), yet we did not find any association between other ICG parameters and EF, which is in contrast with the results obtained by other researchers [ 3 , 6 ]. After the distribution of the subjects according to systolic function impairment, differences were found in the evaluation of TFC, TFCI, and STR, but other ICG parameters did not differ.…”

Section: Discussioncontrasting

confidence: 99%

“…A study involving 54 patients showed a correlation between EF and STR on ICG (r=−0.54, p<0.01); if EF<50%, then STR>0.5 (93% sensitivity and 85% specificity) [ 7 ]. Another study, which included 36 patients, showed a correlation between EF and ICG parameters such as the pre-ejection period (PEP) (p=0.0069), left-ventricular ejection time (LVET) (p=0.0462), and STR (p=0.0031) [ 8 ]. A study involving 29 patients showed a good correlation between the thoracic fluid content (TFC) on ICG and an increased pulmonary capillary wedge pressure (r=0.69, p<0.001), with 86% sensitivity and 94% specificity of TFC [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Applicability of Impedance Cardiography During Heart Failure Flare-Ups

et al. 2016

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BackgroundHeart failure (HF) accounts for about 5% of all causes of urgent hospital admissions, and the overall mortality of HF patients within 1 year after hospitalization is 17–45%. Transthoracic impedance cardiography (ICG) is a safe, non-invasive diagnostic technique that helps to detect various parameters that define different cardiac functions. The aim of this study was to investigate the value of ICG parameters in patients hospitalized due to HF flare-ups.Material/MethodsThe study included 60 patients (24 women and 36 men) who were admitted to intensive care units because of an acute episode of HF without signs of myocardial infarction. The diagnosis of HF as the main reason for hospitalization was verified according to the universally accepted techniques. ICG data were compared to those obtained via other HF diagnostic techniques.ResultsA moderately strong relationship was found between the ejection fraction (EF) and the systolic time ratio (STR) r=−0.4 (p=0.002). Findings for STR and thoracic fluid content index (TFCI) differed after dividing the subjects into groups according to the EF (p<0.05). A moderately strong relationship was found between brain natriuretic peptide and TFCI r=0.425 (p=0.001), left cardiac work index (LCWI) r=−0.414 (p=0.001). Findings for TFCI, LCWI, and cardiac output differed after dividing the subjects into groups according to HF NYHA classes (p<0.05).ConclusionsTransthoracic impedance cardiography parameters could be applied for the diagnostics and monitoring of HF, but further studies are required to evaluate the associations between ICG findings and HF.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Applicability of Impedance Cardiography During Heart Failure Flare-Ups

et al. 2016

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“…BSA was calculated using the Du Bois formula:[ 17 ] BSA = 0.007148 (height) 0.725 (weight) 0.425 , with height measured in meters and weight measured in kilograms. LV systolic function was determined by the LV ejection fraction (EF), which was calculated according to the modified Simpson's formula[ 18 ] and Simpson's biplane method. The EF and fractional shortening (FS) were calculated by using Teichholz's M-mode formula and were all measured in the parasternal long-axis view.…”

Section: Ethodsmentioning

confidence: 99%

Astragalus Membranaceus Improving Asymptomatic Left Ventricular Diastolic Dysfunction in Postmenopausal Hypertensive Women with Metabolic Syndrome

et al. 2018

Chinese Medical Journal

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Background:Postmenopausal women with metabolic syndrome (MetS) have increased cardiovascular morbidity and left ventricular diastolic dysfunction (LVDD). The various protective effects of astragalus membranaceus (AM) have been described in previous studies. Therefore, this study aimed to evaluate the effects of different doses of AM on diastolic function in postmenopausal hypertensive women with MetS.Methods:This was a prospective, randomized controlled study. The postmenopausal hypertensive patients with MetS were enrolled from Lanzhou University Second Hospital from March 2014 to April 2015. Patients were divided into three groups: control group (received conventional medical treatment), AM Group 1 (received AM capsules at 5 g/d additionally), and AM Group 2 (received AM capsules at 10 g/d additionally). Echocardiographic and clinical characteristics were evaluated before and 12 months after treatment. Quantitative data were analyzed using unpaired t-test, analysis of variance, and multiple linear regression analysis.Results:A total of 154 patients were subjected to final analysis. In the AM Group 2, significant improvements were noted in diastolic function 12 months after treatment than those of the control group, including the early diastolic mitral annular velocity (E’; 0.065 ± 0.007 m/s vs. 0.061 ± 0.008 m/s, P = 0.014), the ratio of the early diastolic mitral peak flow velocity to the late diastolic mitral peak flow velocity (E/A; 0.81 ± 0.05 vs. 0.80 ± 0.06, P = 0.012), the ratio of E’ to the late diastolic mitral annular velocity (E’/A’; 0.56 ± 0.12 vs. 0.51 ± 0.13, P = 0.048), and the ratio of the early diastolic mitral peak flow velocity (E) to E’ (E/E’; 10.70 ± 1.30 vs. 11.37 ± 1.73, P = 0.031). After treatment, E/E’ (10.70 ± 1.30 vs. 11.24 ± 1.56, P = 0.021), deceleration time (DT; 261.49 ± 44.41 ms vs. 268.74 ± 53.87 ms, P = 0.046), and E’/A’ (0.56 ± 0.12 vs. 0.52 ± 0.13, P = 0.019) values improved more significantly than those of AM Group 2 before treatment. Besides, waist circumference was positively correlated with E’ (r = 0.472; P = 0.003) and E’/A’ (r = 0.321; P = 0.047). In addition, the waist-to-hip ratio was a significant predictor of DT (r = 0.276; P = 0.041), E’ (r = −0.590; P < 0.001), E/E’ (r = 0.454; P = 0.004), and E’/A’ (r = −0.377; P = 0.018).Conclusions:Conventional medical plus AM therapy improved diastolic function. Moreover, WC and WHR might be risk factors for LVDD.Chinese Clinical Trial Register:ChiCTR-TRC-11001747. http://www.chictr.org.cn/showprojen.aspx?proj=7798.

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“…The values of these parameters in the HFrEF subgroup were comparable to those presented in earlier reports. Kaszuba et al demonstrated a relationship between the ejection fraction and PEP, LVET, and STR, although that particular study included patients with no manifestations of HF exacerbation [43]. On the other hand, the hemodynamic profile of left ventricular function in the HFmrEF/HFpEF subgroup more closely resembled that in patients with uncomplicated hypertension.…”

Section: Discussionmentioning

confidence: 96%

Clinical presentations and hemodynamic parameters in patients hospitalized due to acute heart failure stratified by the left-ventricular ejection fraction

Galas

Krzesiński

Gielerak

et al. 2018

Medical Research Journal

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Background: Currently, one of the most common causes of hospitalization, especially in the elderly, is heart failure (HF) exacerbation. In nearly 95% of patients, this is caused by fluid overload. There have been studies comparing the rates of comorbidities and biochemical disturbances in HF patients; however, their hemodynamic parameters have not yet been assessed. Thus, the aim of this study was to compare the clinical presentations and hemodynamic parameters assessed via impedance cardiography (ICG) in patients hospitalized due to acute HF, stratified by the left-ventricular ejection fraction (LVEF). Methods: This study enrolled 102 patients, aged > 18 years, hospitalized due to decompensated HF. Ninety-seven patients (74 men, 23 women) underwent echocardiographic examination. Biochemical and hemodynamic parameters were assessed on the day of admission and, subsequently, every other day during hospitalization. Based on echocardiographic findings and the ESC guidelines the study group was divided into the following subgroups: HFrEF (EF < 40%), HFpEF (EF > 50%), and HFmrEF (EF 40-49%). Results: The HFrEF group, which constituted 60.8% of patients (n = 58), was predominantly male (P = 0.0005); and most had elevated N-terminal pro-brain natriuretic peptide levels (P = 0.0008). The HFpEF and HFmrEF subgroups, jointly (n = 38), were characterized by higher systolic blood pressure (P = 0.0001), and lower hemoglobin levels (P = 0.003). The hemodynamic assessment showed that HFrEF patients had higher total fluid content (P = 0.005) and lower systolic time ratio (P = 0.0002). Conclusions: Despite similar clinical presentation, patients with HF exhibited different values of hemodynamic and biochemical parameters depending on their LVEF; this indicates non-homogeneity of pathomechanisms and causes of HF decompensation.

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Comparing impedance cardiography and echocardiography in the assessment of reduced left ventricular systolic function

Cited by 13 publications

References 22 publications

Applicability of Impedance Cardiography During Heart Failure Flare-Ups

Applicability of Impedance Cardiography During Heart Failure Flare-Ups

Astragalus Membranaceus Improving Asymptomatic Left Ventricular Diastolic Dysfunction in Postmenopausal Hypertensive Women with Metabolic Syndrome

Clinical presentations and hemodynamic parameters in patients hospitalized due to acute heart failure stratified by the left-ventricular ejection fraction

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