Read by QxMD icon Read

Impedance cardiography

Saulius Sadauskas, Albinas Naudžiūnas, Alvydas Unikauskas, Edita Mašanauskienė, Giedrė Bakšytė, Andrius Macas
BACKGROUND Heart 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 AND METHODS The 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...
October 9, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Jae-Young Shin, Jun-Hwan Lee, Boncho Ku, Jang Han Bae, Min-Ho Un, Jaeuk U Kim, Tae-Hun Kim
INTRODUCTION: This study aims to investigate the effects of acupuncture stimulation on the radial artery's pressure pulse wave, along with various hemodynamic parameters, and to explore the possible underlying mechanism of pulse diagnosis in healthy participants in their twenties. METHODS AND ANALYSIS: This study is a prospective, single-arm, exploratory clinical study. A total of 25 healthy participants, without regard to gender, in their twenties will be recruited by physicians...
September 2016: Journal of Pharmacopuncture
S Vonck, J Oben, A S Staelens, D Lanssens, K Tomsin, W Gyselaers
INTRODUCTION: Maternal cardiovascular adaptations are mandatory for a normal course of pregnancy. Disturbed adaptations predispose to gestational complications further in pregnancy such as hypertension disorders and/or fetal growth restriction. We aim to explore the early gestational cardiovascular profile in uncomplicated pregnancy, in gestational hypertensive disorders and isolated intra-uterine growth retardation. METHODS: Cardiovascular assessments were done using a standard protocol with impedance cardiography (Niccomo, SonoSite, MedisMedinizinischeMesstechnik GmbH, Ilmenau, Germany) and bio-impedance (Maltron BIOSCAN 920-II; Maltron International LTD, Essex, UK) around 12 weeks of gestation...
August 2016: Journal of Maternal-fetal & Neonatal Medicine
Abdul Qadir Javaid, Hazar Ashouri, Srini Tridandapani, Omer T Inan
The ballistocardiogram (BCG), a signal describing the reaction forces of the body to cardiac ejection of blood, has recently gained interest in the research community as a potential tool for monitoring the mechanical aspects of cardiovascular health for patients at home and during normal activities of daily living. An important limitation in the field of BCG research is that while the BCG signal measures the forces of the body, the information desired (and understood) by clinicians and caregivers, regarding mechanical health of the cardiovascular system, is typically expressed as blood pressure or flow...
2016: IEEE Journal of Translational Engineering in Health and Medicine
Nathalie Linn Anikken Holme, Erling Bekkestad Rein, Maja Elstad
PURPOSE: Hypovolemia decreases preload and cardiac stroke volume. Cardiac stroke volume (SV) and its variability (cardiac stroke volume variability, SVV) have been proposed as clinical tools for detection of acute hemorrhage. We compared three non-invasive SV measurements and investigated if respiration-induced fluctuations in SV may detect mild and moderate hypovolemia in spontaneously breathing humans. METHODS: Ten healthy subjects underwent experimental central hypovolemia induced by lower body negative pressure to -60 mmHg or onset of presyncopal symptoms...
September 10, 2016: European Journal of Applied Physiology
Kimberly G Lockwood, J Richard Jennings, Karen A Matthews
Inflammation plays a critical role in the pathophysiology of cardiovascular disease (CVD) and levels of circulating inflammatory markers are associated with future CVD risk. However, the physiological mechanisms that control systemic levels of circulating inflammatory markers are not well understood. Here, we explore possible autonomic nervous system mechanisms by testing whether resting and stressor-evoked cardiovascular responses are associated with two markers of systemic inflammation: interleukin(IL)-6 and C-reactive protein (CRP)...
August 24, 2016: Brain, Behavior, and Immunity
Mohammed Ebrahim, Sanjeet Hegde, Beth Printz, Mark Abcede, James A Proudfoot, Christopher Davis
Noninvasive measurement of cardiac output (CO) and particularly stroke volume (SV) remain difficult but potentially valuable. These variables can be particularly challenging to measure in children with congenital heart disease (CHD). Impedance cardiography (IC) is a technique shown to be accurate in measuring SV in adults and in children with structurally normal hearts. The ease of use and rapidity of SV measurement using IC makes it potentially attractive for young patients with CHD. Advances in IC technology have led to more sophisticated signal-morphology IC (SMIC) devices that may further improve accuracy...
August 25, 2016: Pediatric Cardiology
Cathríona R Monnard, Jean-Pierre Montani, Erik K Grasser
BACKGROUND AND PURPOSE: Energy drinks (EDs) are suspected to induce potential adverse cardiovascular effects and have recently been shown to reduce cerebral blood flow velocity (CBFV) in young, healthy subjects. Gender differences in CBFV in response to EDs have not previously been investigated, despite the fact that women are more prone to cardiovascular disturbances such as neurocardiogenic syncope than men. Therefore, the aim of this study was to explore gender differences in cerebrovascular and cardiovascular responses to EDs...
2016: Frontiers in Physiology
Anna Kazimierczak, Paweł Krzesiński, Grzegorz Gielerak, Beata Uziębło-Życzkowska, Paweł Smurzyński, Robert Ryczek, Andrzej Cwetsch, Andrzej Skrobowski
BACKGROUND Advanced heart failure (HF) is commonly accompanied by central sleep apnea (CSA) with Cheyne-Stokes respiration (CSR). The aim of this study was to evaluate the relationship between CSA/CSR and other clinical features of HF, with particular emphasis on cardiovascular hemodynamics. MATERIAL AND METHODS In 161 stable HF patients with left ventricular ejection fraction (LVEF) ≤45% (NYHA class I-III; mean LVEF 32.8%) the clinical evaluation included: LVEF; left and right ventricular end-diastolic diameter (LVDd, RVDd); ratio of early transmitral flow velocity to early diastolic septal mitral annulus velocity (E/e') assessed by echocardiography; stroke index (SI); heart rate (HR); cardiac index (CI); and systemic vascular resistance index (SVRI) assessed by impedance cardiography (ICG)...
2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Sabrina Bernardez-Pereira, Luciana Gioli-Pereira, Fabiana G Marcondes-Braga, Paulo Caleb Junior Lima Santos, Joceli Mabel Rocha Spina, Andréa Roseli Vançan Russo Horimoto, Hadassa Campos Santos, Fernando Bacal, Fábio Fernandes, Alfredo Jose Mansur, Ricardo Pietrobon, José Eduardo Krieger, Evandro Tinoco Mesquita, Alexandre Costa Pereira
OBJECTIVE: The aim of this study is to assess the association between genetic ancestry, self-declared race and haemodynamic parameters in patients with chronic heart failure (HF). METHODS: Observational, cross-sectional study. Eligible participants were aged between 18 and 80 years; ejection fraction was ≤50%. Patients underwent genetic analysis of ancestry informative markers, echocardiography and impedance cardiography (ICG). Race was determined by self-classification into two groups: white and non-white...
2016: Open Heart
A de Sitter, R M Verdaasdonk, T J C Faes
Impedance cardiography (ICG) is a method to evaluate cardiac-stroke volume and cardiac-output by measuring the cardiac-synchronous changes in the dynamic trans-thoracic electrical impedance (ΔZ). Clinical evaluations on the accuracy of ICG showed varying results. Consequently, the classic assumption in ICG-the aorta as a main source of ΔZ-is questioned and subsequently investigated in simulation studies using mathematical models of the electrical resistivity of the human body. The aim is to review the consensus in mathematical modelling studies that investigate the origin of the ΔZ as measured in ICG...
September 2016: Physiological Measurement
Thomas Freidl, Nariae Baik, Gerhard Pichler, Bernhard Schwaberger, Barbara Zingerle, Alexander Avian, Berndt Urlesberger
BACKGROUND: Substantial haemodynamic changes occur during the first minutes after birth. Currently, only heart rate (HR) and arterial oxygen saturation are routinely used to monitor haemodynamic transition after birth. OBJECTIVES: The aim of the present study was to continuously assess haemodynamic changes during transition in term infants for the first time by using electrical velocimetry (EV), a new method of non-invasive cardiac output monitoring (NICOM), based on impedance cardiography technology...
August 17, 2016: Neonatology
Marcelo A Rada, Carlos R Galarza, Lucas S Aparicio, Paula E Cuffaro, José M Piccinini, José Alfie, Margarita S Morales, Jessica Barochiner, Marcos J Marin, Gabriel D Waisman
Volume expansion (1,2) is frequent among hypertensives.(3) Impedance Cardiography (ICG) measures hemodynamic disturbances,(3,4) and apparently estimates volume excess (5) through the thoracic fluid content (TFC), an inverse of thoracic impedance(Z0 ). This article is protected by copyright. All rights reserved.
August 11, 2016: Clinical and Experimental Pharmacology & Physiology
Madhavi Mallam, K Chandra Bhushana Rao
[This corrects the article DOI: 10.1186/s40064-016-2461-5.].
2016: SpringerPlus
Madhavi Mallam, K Chandra Bhutan Rao
In this paper, a new model for adaptive artifact cancelation in impedance cardiography (ICG) signals is presented. It is a hybrid model based on wavelet decomposition and an adaptive filter. A novel feature of this model is the implementation of reference-free adaptive artifact cancellers (AAC). For this implementation, the reference signal is constructed using a wavelet transformation. During critical conditions the filter weights may be negative and cause an imbalance in the convergence. To overcome this problem, we introduce non-negative adaptive algorithms in the proposed artifact canceller...
2016: SpringerPlus
Souhir Chabchoub, Sofienne Mansouri, Ridha Ben Salah
Impedance cardiography (ICG) is a non-invasive technique for diagnosing cardiovascular diseases. In the acquisition procedure, the ICG signal is often affected by several kinds of noise which distort the determination of the hemodynamic parameters. Therefore, doctors cannot recognize ICG waveform correctly and the diagnosis of cardiovascular diseases became inaccurate. The aim of this work is to choose the most suitable method for denoising the ICG signal. Indeed, different wavelet families are used to denoise the ICG signal...
September 2016: Australasian Physical & Engineering Sciences in Medicine
C A Wick, W F Auffermann, A J Shah, O T Inan, P T Bhatti, S Tridandapani
Cardiac computed tomography (CT) angiography using prospective gating requires that data be acquired during intervals of minimal cardiac motion to obtain diagnostic images of the coronary vessels free of motion artifacts. This work is intended to assess B-mode echocardiography as a continuous-time indication of these quiescent periods to determine if echocardiography can be used as a cost-efficient, non-ionizing modality to develop new prospective gating techniques for cardiac CT. These new prospective gating approaches will not be based on echocardiography itself but on CT-compatible modalities derived from the mechanics of the heart (e...
July 21, 2016: Physics in Medicine and Biology
Sara Magnani, Filippo Tocco, Giovanna Ghiani, Elisabetta Marongiu, Gianamrco Sainas, Antonio Crisafulli
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
D C D van Eerd, I A Brussé, V F R Adriaens, R T Mankowski, S F E Praet, M Michels, M Langeveld
In this report we describe a female Long-Chain 3-Hydroxyacyl-CoA Dehydrogenase Deficiency (LCHADD) patient who suffered from severe exercise intolerance. At age 34, the patient became pregnant for the first time. After an uneventful first 32 weeks of pregnancy she developed sinus tachycardia (resting heart rate 120-134 bpm) and lactate and creatinine kinase levels increased (3.3 mmol/L and 264 U/L, respectively). Increasing MCT supplementation (dose and frequency of administration) lowered heart rate and improved biochemical parameters...
June 23, 2016: JIMD Reports
Pauliina Kangas, Anna Tahvanainen, Antti Tikkakoski, Jenni Koskela, Marko Uitto, Jari Viik, Mika Kähönen, Tiit Kööbi, Jukka Mustonen, Ilkka Pörsti
BACKGROUND: Men and women differ in the risk of cardiovascular disease, but the underlying mechanisms are not completely understood. We examined possible sex-related differences in supine and upright cardiovascular regulation. METHODS AND RESULTS: Hemodynamics were recorded from 167 men and 167 women of matching age (≈45 years) and body mass index (≈26.5) during passive head-up tilt. None had diabetes mellitus or cardiovascular disease other than hypertension or used antihypertensive medication...
June 2016: Journal of the American Heart Association
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"