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Impedance cardiography

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https://www.readbyqxmd.com/read/29285109/acute-kidney-injury-in-cancer-patients-and-impedance-cardiography-assisted-renal-replacement-therapy-experience-from-the-onconephrology-unit-of-a-chinese-tertiary-hospital
#1
Tao Wang, Yan Zhang, Qingxia Li, Shumin Jia, Changjin Shi, Kai Niu, Bing Liu
Acute kidney injury (AKI) in cancer patients may disrupt anticarcinogenic treatment and greatly increase associated mortality rates. The present study reported on the management of cancer patients with AKI and, from the nephrologic viewpoint, on the significance of fine volume control during the continuous renal replacement therapy (CRRT). The records of 117 cancer patients with AKI treated over three years were reviewed and their data were compared with those of 120 healthy controls. AKI was defined according to the Kidney Disease: Improving Global Outcomes criteria with serum creatinine levels determined on initial admission and for the diagnosis of AKI...
December 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29229652/protocol-for-the-specialist-supervised-individualised-multifactorial-treatment-of-new-clinically-diagnosed-type-2-diabetes-in-general-practice-ida-a-prospective-controlled-multicentre-open-label-intervention-study
#2
Jacob Volmer Stidsen, Jens Steen Nielsen, Jan Erik Henriksen, Søren Gunnar Friborg, Reimar Wernich Thomsen, Thomas Bastholm Olesen, Michael Hecht Olsen, Henning Beck-Nielsen
INTRODUCTION: We present the protocol for a multifactorial intervention study designed to test whether individualised treatment, based on pathophysiological phenotyping and individualised treatment goals, improves type 2 diabetes (T2D) outcomes. METHODS AND ANALYSIS: We will conduct a prospective controlled multicentre open-label intervention study, drawing on the longitudinal cohort of the Danish Centre for Strategic Research in Type 2 Diabetes (DD2). New clinically diagnosed patients with T2D in the intervention group will be assigned to receive individualised treatment by their general practitioner...
December 10, 2017: BMJ Open
https://www.readbyqxmd.com/read/29198637/-current-status-of-noninvasive-hemodynamics-in-hypertension
#3
G Waisman
Hypertension is a haemodynamic disorder resulting from a persistent mismatch between cardiac output and peripheral resistance. Hypertension undergoes haemodynamic progression during its natural history. Impedance cardiography is a method of evaluating the cardiovascular system that obtains haemodynamic information from beat to beat through the analysis of variations in the impedance of the thorax on the passage of an electric current. Impedance cardiography unmasks the haemodynamic deterioration underlying the increase in blood pressure as age and systolic blood pressure increases...
November 29, 2017: Hipertensión y Riesgo Vascular
https://www.readbyqxmd.com/read/29198129/hemodynamic-effects-of-epinephrine-in-rats-evaluation-by-impedance-cardiography
#4
C H Turkseven, E Pekoglu, B Buyukakilli
BACKGROUND AND OBJECTIVES: This study was aimed to examine how inotropic effects of intravenously injected epinephrine change thoracic impedance measurements and to reveal the possible effects of this change on other hemodynamic parameters by using the technique of impedance cardiography. METHODS: 10 male Wistar Albino rats were divided into two equal groups: control and epinephrine. 0.2 mg/kg of epinephrine was administered to the rats in the epinephrine group via the tail vein...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/29177005/altered-pre-ejection-period-response-to-social-evaluative-threat-in-adolescents-with-autism-spectrum-disorder
#5
E Kale Edmiston, Rachael A Muscatello, Blythe A Corbett
Introduction: The autonomic nervous system (ANS) is involved in regulating social behavior; Autism Spectrum Disorder (ASD) is characterized by alterations in social behavior and reduced physiological response to threat. We hypothesized that adolescents with ASD would show reduced ANS response to social threat. Methods: Eighteen males with ASD and thirteen males with typical development (TD), ages 12 to 17, completed a social threat paradigm while wearing an impedance cardiography apparatus...
April 2017: Research in Autism Spectrum Disorders
https://www.readbyqxmd.com/read/29172784/good-agreement-between-echocardiography-and-impedance-cardiography-in-the-assessment-of-left-ventricular-performance-in-hypertensive-patients
#6
Rodrigo Nazário Leão, Pedro Marques Da Silva, Rita Marques Pocinho, Marta Alves, Daniel Virella, Roberto Palma Reis
BACKGROUND: Impedance cardiography (ICG) is a noninvasive hemodynamic monitoring tool which can define hypertensive patients' hemodynamic profiles and help to tailor antihypertensive therapy. This study assesses the concordance between ICG-derived indexes used to evaluate left ventricular performance and transthoracic echocardiography (TTE) in hypertensive patients. METHODS: In this IMPEDDANS post-hoc analysis, the ICG-derived indexes are compared with TTE by Bland-Altman method...
November 27, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/29168462/potential-benefit-of-optimizing-atrioventricular-interventricular-delays-in-patients-with-cardiac-resynchronization-therapy
#7
Bozena Urbanek, Krzysztof Kaczmarek, Artur Klimczak, Jan Ruta, Michal Chudzik, Katarzyna Piestrzeniewicz, Pawel Ptaszynski, Jerzy Krzysztof Wranicz
BACKGROUND & OBJECTIVES: The clinical benefit of optimization (OPT) of atrioventricular delay (AVD) and interventricular delay (VVD) in cardiac resynchronization therapy (CRT) remains debatable. This study was aimed to determine the influence of AVD and VVD OPT on selected parameters in patients early after CRT implantation and at mid-term follow up (FU). METHODS: Fifty two patients (61±10 yr, 23 males) with left bundle branch block, left ventricular ejection fraction (LVEF) ≤35 per cent and heart failure were selected for CRT implantation...
July 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/29150800/beat-to-beat-estimation-of-stroke-volume-using-impedance-cardiography-and-artificial-neural-network
#8
S M M Naidu, Prem C Pandey, Uttam R Bagal, Suhas P Hardas
Impedance cardiography is a low-cost noninvasive technique, based on monitoring of the thoracic impedance, for estimation of stroke volume (SV). Impedance cardiogram (ICG) is the negative of the first derivative of the impedance signal. A technique for beat-to-beat SV estimation using impedance cardiography and artificial neural network (ANN) is proposed. A three-layer feed-forward ANN with error back-propagation algorithm is optimized by examining the effects of number of neurons in the hidden layer, activation function, training algorithm, and set of input parameters...
November 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29131882/time-course-response-of-the-heart-and-circulatory-system-to-active-postural-changes
#9
Jo P Pauls, Llion Roberts, Tom Burgess, John/F Fraser, Shaun/D Gregory, Geoff Tansley
Rotary blood pumps (RBPs) used for mechanical circulatory support of heart failure patients cannot passively change pump flow sufficiently in response to frequent variations in preload induced by active postural changes. A physiological control system that mimics the response of the healthy heart is needed to adjust pump flow according to patient demand. Thus, baseline data is required on how the healthy heart (i.e. heart rate (HR) and cardiac output (CO)) and circulatory system (i.e. systemic vascular resistance (SVR)) respond...
November 13, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29123459/wearable-sensing-of-cardiac-timing-intervals-from-cardiogenic-limb-vibration-signals
#10
Andrew D Wiens, Ann Johnson, Omer T Inan
In this paper we describe a new method to measure aortic valve opening (AVO) and closing (AVC) from cardiogenic limb vibrations (i.e., wearable ballistocardiogram [BCG] signals). AVO and AVC were detected for each heartbeat with accelerometers on the upper arm (A), wrist (W), and knee (K) of 22 subjects following isometric exercise. Exercise-induced changes were recorded with impedance cardiography. The method, Filter BCG, detects peaks in distal vibrations after filtering with individually-tuned bandpass filters...
March 1, 2017: IEEE Sensors Journal
https://www.readbyqxmd.com/read/29102503/maternal-hemodynamics-a-method-to-classify-hypertensive-disorders-of-pregnancy
#11
Enrico Ferrazzi, Tamara Stampalija, Lorenzo Monasta, Daniela Di Martino, Sharona Vonck, Wilfried Gyselaers
BACKGROUND: The classification of hypertensive disorders of pregnancy is based on the time at the onset of hypertension, proteinuria, and other associated complications. Maternal hemodynamic interrogation in hypertensive disorders of pregnancy considers not only the peripheral blood pressure but also the entire cardiovascular system, and it might help to classify the different clinical phenotypes of this syndrome. OBJECTIVE: This study aimed to examine cardiovascular parameters in a cohort of patients affected by hypertensive disorders of pregnancy according to the clinical phenotypes that prioritize fetoplacental characteristics and not the time at onset of hypertensive disorders of pregnancy...
November 2, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29073767/arterial-stiffness-is-associated-with-qtc-interval-prolongation-in-patients-with-heart-failure
#12
Salah Al-Zaiti, Samir Saba, Rodolfo Pike, Jennifer Williams, Fadi Khraim
BACKGROUND: A prolonged corrected QT (QTc) interval is a known risk factor for adverse cardiac events. Understanding the determinants and physiologic correlates of QTc is necessary for selecting proper strategies to reduce the risk of adverse events in high-risk patients. We sought to evaluate the role of arterial stiffness in heart failure as a determinant of QTc prolongation. METHOD: This was an observational study that recruited ambulatory heart failure patients (New York Heart Association Classes I-II) from an outpatient heart failure clinic...
January 1, 2017: Biological Research for Nursing
https://www.readbyqxmd.com/read/29051338/the-occurrence-of-cardiac-output-decrease-via-stroke-volume-is-more-pronounced-in-women-than-in-men-during-prolonged-dry-static-apnoea
#13
Sara Magnani, Gabriele Mulliri, Gianmarco Sainas, Giovanna Ghiani, Virginia Pinna, Irene Sanna, Antonio Crisafulli, Filippo Tocco
Little is known on gender differences in autonomic cardiovascular regulation of diving response (DR) and the few available studies into these differences were conducted on subjects with limited or no diving experience. We examined gender influence on hemodynamics during dry-static apnoea (SA) in 8 male and 8 female elite divers matched for their breath-hold (BH) ability. Hemodynamics was assessed by means of simultaneous echocardiography and impedance cardiography measurements and arterial pressure and oxygen saturation (SaO2) were also collected...
October 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28983659/cardiac-and-peripheral-vasomotor-autonomic-functions-in-late-onset-transthyretin-val30met-familial-amyloid-polyneuropathy
#14
Haruki Koike, Tomohiko Nakamura, Atsushi Hashizume, Ryoji Nishi, Shohei Ikeda, Yuichi Kawagashira, Masahiro Iijima, Masahisa Katsuno, Gen Sobue
The objective of this study was to systematically investigate cardiac and peripheral vasomotor autonomic functions in late-onset transthyretin Val30Met familial amyloid polyneuropathy (FAP ATTR Val30Met) patients from non-endemic areas. The coefficient of variation of R-R intervals (CVR-R), responses to the Valsalva manoeuvre, head-up tilt test with impedance cardiography, noradrenaline infusion test, and (123)I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy were assessed in eight patients. Although only four patients manifested orthostatic hypotension during the head-up tilt test, CVR-R, responses to the Valsalva manoeuvre, and myocardial MIBG uptake indicated a higher prevalence of cardiac sympathetic and parasympathetic dysfunction...
November 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28948370/reliability-of-peak-exercise-stroke-volume-assessment-by-impedance-cardiography-in-patients-with-residual-right-outflow-tract-lesions-after-congenital-heart-disease-repair
#15
Antoine Legendre, D Bonnet, L Bosquet
Global ventricular response to exercise may be useful in follow-up of patients with residual right outflow tract lesions after congenital heart disease repair. In this context, impedance cardiography is considered accurate for stroke volume (SV) measurement during exercise testing, however, to date, only partial assessment of its reliability has been reported. We retrospectively evaluated relative and absolute reliability of peak SV by impedance cardiography during exercise using intraclass correlation (ICC) and standard error of measurement (SEM) in this population...
September 25, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28939932/prognostic-value-of-selected-echocardiographic-impedance-cardiographic-and-hemodynamic-parameters-determined-during-right-heart-catheterization-in-patients-qualified-for-heart-transplantation
#16
Wojciech Gilewski, Jarosław Pietrzak, Joanna Banach, Robert Bujak, Jan Błażejewski, Danuta Karasek, Łukasz Wołowiec, Władysław Sinkiewicz
The aim of the study was to verify prognostic value of selected echocardiographic (UKG), impedance cardiography (ICG), and right heart catheterization (RHC) parameters in systolic heart failure (HF). UKG, ICG, and RHC were performed in 46 patients with chronic HF with ejection fraction <35%. During a 1-year follow-up, composite endpoint (death or hospitalization due to HF exacerbation) was achieved by 23 (50.0%) patients. Analysis of receiver operating characteristic (ROC) curves identified UKG parameters: inferior vena cava diameter on inspiration (IVCinsp) >13 mm [area under curve (AUC), 0...
September 22, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28937981/cognitive-function-in-patients-with-stable-coronary-heart-disease-related-cerebrovascular-and-cardiovascular-responses
#17
Mathieu Gayda, Vincent Gremeaux, Louis Bherer, Martin Juneau, Joffrey Drigny, Olivier Dupuy, Gabriel Lapierre, Véronique Labelle, Annik Fortier, Anil Nigam
Chronic exercise has been shown to prevent or slow age-related decline in cognitive functions in otherwise healthy, asymptomatic individuals. We sought to assess cognitive function in a stable coronary heart disease (CHD) sample and its relationship to cerebral oxygenation-perfusion, cardiac hemodynamic responses, and [Formula: see text] peak compared to age-matched and young healthy control subjects. Twenty-two young healthy controls (YHC), 20 age-matched old healthy controls (OHC) and 25 patients with stable CHD were recruited...
2017: PloS One
https://www.readbyqxmd.com/read/28937241/preejection-period-as-a-sympathetic-activity-index-a-role-of-confounding-factors
#18
J Krohova, B Czippelova, Z Turianikova, Z Lazarova, I Tonhajzerova, M Javorka
In previous studies, one of the systolic time intervals - preejection period (PEP) - was used as an index of sympathetic activity reflecting the cardiac contractility. However, PEP could be also influenced by several other cardiovascular variables including preload, afterload and diastolic blood pressure (DBP). The aim of this study was to assess the behavior of the PEP together with other potentially confounding cardiovascular system characteristics in healthy humans during mental and orthostatic stress (head-up tilt test - HUT)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28902662/circadian-hemodynamics-in-men-and-women-with-high-blood-pressure-dipper-vs-nondipper-and-racial-differences
#19
Andrew Sherwood, LaBarron K Hill, James A Blumenthal, Alan L Hinderliter
OBJECTIVE: The 'nondipping' pattern of circadian blood pressure (BP) variation is an established independent predictor of adverse cardiovascular outcomes. Although this phenomenon has been widely studied, its underlying circadian hemodynamics of cardiac output and systemic vascular resistance (SVR) have not been well characterized. We evaluated the hypothesis that BP nondipping would be associated with a blunted night-time reduction in SVR in a biracial sample of 140 (63 African-American and 77 white) men and women with elevated clinic BP (130-159/85-99 mmHg)...
September 11, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28895755/hemodynamic-characterization-of-hypertensive-patients-with-an-exaggerated-orthostatic-blood-pressure-variation
#20
Jessica Barochiner, Lucas S Aparicio, José Alfie, Marcelo A Rada, Margarita S Morales, Carlos R Galarza, Paula E Cuffaro, Marcos J Marín, Rocío Martínez, Gabriel D Waisman
Exaggerated orthostatic blood pressure variation (EOV) is a poorly understood phenomenon related to high cardiovascular risk. We aimed to determine whether hypertensive patients with EOV have a distinct hemodynamic pattern, assessed through impedance cardiography. METHODS: In treated hypertensive patients, we measured the cardiac index (CI), systemic vascular resistance index (SVRI), blood pressure (BP), and heart rate (HR) in the supine and standing (after 3 minutes) positions, defining three groups according to BP variation: 1) Normal orthostatic BP variation (NOV): standing systolic BP (stSBP)-supine systolic BP (suSBP) between -20 and 20 mmHg and standing diastolic BP (stDBP)-supine diastolic BP (suDBP) between -10 and 10 mmHg; 2) orthostatic hypotension (OHypo): stSBP-suSBP≤-20 or stDBP-suDBP≤-10 mmHg; 3) orthostatic hypertension (OHyper): stSBP-suSBP≥20 or stDBP-suDBP≥10 mmHg...
September 12, 2017: Clinical and Experimental Hypertension: CHE
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