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Heart variability

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https://www.readbyqxmd.com/read/29140312/plasma-amino-acid-abnormalities-in-chronic-heart-failure-mechanisms-potential-risks-and-targets-in-human-myocardium-metabolism
#1
Roberto Aquilani, Maria Teresa La Rovere, Daniela Corbellini, Evasio Pasini, Manuela Verri, Annalisa Barbieri, Anna Maria Condino, Federica Boschi
The goal of this study was to measure arterial amino acid levels in patients with chronic heart failure (CHF), and relate them to left ventricular function and disease severity. Amino acids (AAs) play a crucial role for heart protein-energy metabolism. In heart failure, arterial AAs, which are the major determinant of AA uptake by the myocardium, are rarely measured. Forty-one subjects with clinically stable CHF (New York Heart Association (NYHA) class II to IV) were analyzed. After overnight fasting, blood samples from the radial artery were taken to measure AA concentrations...
November 15, 2017: Nutrients
https://www.readbyqxmd.com/read/29138508/fetal-cardiac-cine-magnetic-resonance-imaging-in-utero
#2
Jerome Chaptinel, Jerome Yerly, Yvan Mivelaz, Milan Prsa, Leonor Alamo, Yvan Vial, Gregoire Berchier, Chantal Rohner, François Gudinchet, Matthias Stuber
Fast magnetic resonance imaging (MRI) led to the emergence of 'cine MRI' techniques, which enable the visualization of the beating heart and the assessment of cardiac morphology and dynamics. However, established cine MRI methods are not suitable for fetal heart imaging in utero, where anatomical structures are considerably smaller and recording an electrocardiogram signal for synchronizing MRI data acquisition is difficult. Here we present a framework to overcome these challenges. We use methods for image acquisition and reconstruction that robustly produce images with sufficient spatial and temporal resolution to detect the heart contractions of the fetus, enabling a retrospective gating of the images and thus the generation of images of the beating heart...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29138232/relationship-of-echocardiographic-z-scores-adjusted-for-body-surface-area-to-age-sex-race-and-ethnicity-the-pediatric-heart-network-normal-echocardiogram-database
#3
Leo Lopez, Steven Colan, Mario Stylianou, Suzanne Granger, Felicia Trachtenberg, Peter Frommelt, Gail Pearson, Joseph Camarda, James Cnota, Meryl Cohen, Andreea Dragulescu, Michele Frommelt, Olukayode Garuba, Tiffanie Johnson, Wyman Lai, Joseph Mahgerefteh, Ricardo Pignatelli, Ashwin Prakash, Ritu Sachdeva, Brian Soriano, Jonathan Soslow, Christopher Spurney, Shubhika Srivastava, Carolyn Taylor, Poonam Thankavel, Mary van der Velde, LuAnn Minich
BACKGROUND: Published nomograms of pediatric echocardiographic measurements are limited by insufficient sample size to assess the effects of age, sex, race, and ethnicity. Variable methodologies have resulted in a wide range of Z scores for a single measurement. This multicenter study sought to determine Z scores for common measurements adjusted for body surface area (BSA) and stratified by age, sex, race, and ethnicity. METHODS AND RESULTS: Data collected from healthy nonobese children ≤18 years of age at 19 centers with a normal echocardiogram included age, sex, race, ethnicity, height, weight, echocardiographic images, and measurements performed at the Core Laboratory...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29138230/head-to-head-comparison-of-global-and-regional-two-dimensional-speckle-tracking-strain-versus-cardiac-magnetic-resonance-tagging-in-a-multicenter-validation-study
#4
Mihaela Silvia Amzulescu, Hélène Langet, Eric Saloux, Alain Manrique, Laurianne Boileau, Alisson Slimani, Pascal Allain, Clotilde Roy, Christophe de Meester, Agnès Pasquet, Mathieu De Craene, David Vancraeynest, Anne-Catherine Pouleur, Jean-Louis J Vanoverschelde, Bernhard L Gerber
BACKGROUND: Despite widespread use to characterize and refine prognosis, validation data of two-dimensional (2D) speckle tracking (2DST) echocardiography myocardial strain measurement remain scarce. METHODS AND RESULTS: Global and regional subendocardial peak-systolic Lagrangian longitudinal (LS) and circumferential strain (CS) by 2DST and 2D-tagged (2DTagg) cardiac magnetic resonance imaging were compared against sonomicrometry in a dynamic heart phantom and among each other in 136 patients included prospectively at 2 centers...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29138229/genomic-structural-variations-lead-to-dysregulation-of-important-coding-and-non-coding-rna-species-in-dilated-cardiomyopathy
#5
Jan Haas, Stefan Mester, Alan Lai, Karen S Frese, Farbod Sedaghat-Hamedani, Elham Kayvanpour, Tobias Rausch, Rouven Nietsch, Jes-Niels Boeckel, Avisha Carstensen, Mirko Völkers, Carsten Dietrich, Dietmar Pils, Ali Amr, Daniel B Holzer, Diana Martins Bordalo, Daniel Oehler, Tanja Weis, Derliz Mereles, Sebastian Buss, Eva Riechert, Emil Wirsz, Maximilian Wuerstle, Jan O Korbel, Andreas Keller, Hugo A Katus, Andreas E Posch, Benjamin Meder
The transcriptome needs to be tightly regulated by mechanisms that include transcription factors, enhancers, and repressors as well as non-coding RNAs. Besides this dynamic regulation, a large part of phenotypic variability of eukaryotes is expressed through changes in gene transcription caused by genetic variation. In this study, we evaluate genome-wide structural genomic variants (SVs) and their association with gene expression in the human heart. We detected 3,898 individual SVs affecting all classes of gene transcripts (e...
November 14, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29137013/combination-of-ewing-test-heart-rate-variability-and-heart-rate-turbulence-analysis-for-early-diagnosis-of-diabetic-cardiac-autonomic-neuropathy
#6
Kun Lin, Liling Wei, Zhihua Huang, Qiong Zeng
The aim of this study was to compare and analyze Ewing test, heart rate variability (HRV), and heart rate turbulence (HRT) in the diagnosis of cardiac autonomic neuropathy (CAN) in diabetic patients.Ninety diabetic patients (age 18-78) and 20 nondiabetic control subjects were studied. Standard Ewing test and 24-hour Holter was performed in all participants to evaluate CAN. Patients with Ewing score ≥2 were classified as CAN+.The rate of CAN+ in diabetic patients [44.4% (40/90)] was higher than that in the controls [5% (1/20)] (P < ...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29136632/saturated-fat-intake-is-related-to-heart-rate-variability-in-women-with-polycystic-ovary%C3%A2-syndrome
#7
Scheila K Graff, Fernanda M Mario, Jose A Magalhães, Ruy S Moraes, Poli Mara Spritzer
BACKGROUND/AIMS: There is a heightened risk for cardiovascular diseases in women with polycystic ovary syndrome (PCOS). Alterations in heart rate variability (HRV) may reflect subclinical cardiovascular disease, with a putative association between HRV and dietary fat. This study evaluated HRV in PCOS and control women based on the dietary intake of saturated fatty acid (SFA). METHODS: Biochemical/hormonal profile, resting metabolic rate, physical activity, HRV in response to the Stroop test, and dietary intake were assessed in 84 PCOS and 54 control women stratified by median SFA intake in the PCOS group (8...
November 14, 2017: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/29136325/primary-graft-dysfunction-after-heart-transplantation-incidence-trends-and-associated-risk-factors
#8
Alina Nicoara, David Ruffin, Mary Cooter, Chetan B Patel, Annemarie Thompson, Jacob Schroeder, Mani A Daneshmand, Adrian F Hernandez, Joseph G Rogers, Mihai V Podgoreanu, Madhav Swaminathan, Adam Kretzer, Mark Stafford-Smith, Carmelo A Milano, Raquel R Bartz
Changes in heart transplant (HT) donor and recipient demographics may influence the incidence of primary graft dysfunction (PGD). We conducted a retrospective study to evaluate PGD incidence, trends, and associated risk factors by analyzing consecutive adult patients who underwent HT between January 2009 and December 2014 at our institution. Patients were categorized as having PGD using the International Society of Heart and Lung Transplantation defined criteria. Variables, including clinical and demographic characteristics of donors and recipients, were selected to assess their independent association with PGD...
November 14, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/29136109/using-ecological-propensity-score-to-adjust-for-missing-confounders-in-small-area-studies
#9
Yingbo Wang, Monica Pirani, Anna L Hansell, Sylvia Richardson, Marta Blangiardo
Small area ecological studies are commonly used in epidemiology to assess the impact of area level risk factors on health outcomes when data are only available in an aggregated form. However, the resulting estimates are often biased due to unmeasured confounders, which typically are not available from the standard administrative registries used for these studies. Extra information on confounders can be provided through external data sets such as surveys or cohorts, where the data are available at the individual level rather than at the area level; however, such data typically lack the geographical coverage of administrative registries...
November 9, 2017: Biostatistics
https://www.readbyqxmd.com/read/29135805/failure-of-invasive-airway-placement-on-the-first-attempt-is-associated-with-progression-to-cardiac-arrest-in-pediatric-acute-respiratory-compromise
#10
Hannah R Stinson, Vijay Srinivasan, Alexis A Topjian, Robert M Sutton, Vinay M Nadkarni, Robert A Berg, Tia T Raymond
OBJECTIVES: The aim of this study was to describe the proportion of acute respiratory compromise events in hospitalized pediatric patients progressing to cardiopulmonary arrest, and the clinical factors associated with progression of acute respiratory compromise to cardiopulmonary arrest. We hypothesized that failure of invasive airway placement on the first attempt (defined as multiple attempts at tracheal intubation, and/or laryngeal mask airway placement, and/or the creation of a new tracheostomy or cricothyrotomy) is independently associated with progression of acute respiratory compromise to cardiopulmonary arrest...
November 10, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29135784/fitness-fatness-physical-activity-and-autonomic-function-in-midlife
#11
Antti M Kiviniemi, Nelli Perkiömäki, Juha Auvinen, Maisa Niemelä, Tuija Tammelin, Katri Puukka, Aimo Ruokonen, Sirkka Keinänen-Kiukaanniemi, Mikko P Tulppo, Marjo-Riitta Järvelin, Timo Jämsä, Heikki V Huikuri, Raija Korpelainen
PURPOSE: Although low cardiorespiratory fitness (CRF), physical inactivity, and obesity are associated with impaired autonomic function, they are also extensively interrelated. The present study aimed to assess the extent to which they contribute to autonomic function independently of each other. METHODS: At the age of 46 yr, 1383 men and 1761 women without cardiorespiratory diseases and diabetes underwent assessments of vagally mediated heart rate (HR) variability (root mean square of successive differences in R-R interval (rMMSD)), peak HR during a submaximal step test (CRF), and 60-s HR recovery (HRR)...
December 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29135695/short-term-impact-of-assisted-deliveries-evaluation-based-on-behavioral-pain-scoring-and-heart-rate-variability
#12
Thameur Rakza, Laura Butruille, Ms Lucille Thirel, Veronique Houfflin-Debarge, Régis Logier, Laurent Storme, Julien DE Jonckheere
OBJECTIVES: Assisted deliveries are used in current practice by obstetrical teams during labor when the fetus is likely to face difficulties. In this study, we hypothesized that pain related to instrumental delivery could impair autonomic nervous system activity. METHODS: We investigated infants born by spontaneous delivery (SD group, n=35) and those whose deliveries were assisted by vacuum, forceps or both (AD group, n=35) between the 2 and 4 hours of life. Pain was evaluated using the EDIN behavioral pain scale (Neonatal Pain and Discomfort Scale)...
November 10, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/29135601/sex-differences-in-cardiac-baroreflex-sensitivity-following-isometric-handgrip-exercise
#13
André L Teixeira, Raphael Ritti-Dias, Diego Antonino, Martim Bottaro, Philip J Millar, Lauro C Vianna
PURPOSE: To investigate potential sex-related differences on spontaneous cardiac baroreflex sensitivity (cBRS) following acute isometric handgrip (IHG) exercise. METHODS: Twenty men (23±3 years) and 20 women (24±4 years) randomly performed four sets of 2-min IHG exercise (two sets for each limb) at 30% maximum voluntary contraction (MVC - experimental) or 3% MVC (sham). Beat-to-beat heart rate (HR) and arterial blood pressure (BP) were monitored using finger photoplethysmography before and 10-, 20-, and 30-min following IHG...
November 13, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29135467/univariate-and-multivariate-conditional-entropy-measures-for-the-characterization-of-short-term-cardiovascular-complexity-under-physiological-stress
#14
Martina Valente, Michal Javorka, Alberto Porta, Vlasta Bari, Jana Krohova, Barbora Czippelova, Zuzana Turianikova, Giandomenico Nollo, Luca Faes
A defining feature of physiological systems under the neuroautonomic regulation is their dynamical complexity. The most common approach to assess physiological complexity from short-term recordings, i.e. to compute the rate of entropy generation of an individual system by means of measures of conditional entropy (CE), does not consider that complexity may change when the investigated system is part of a network of physiological interactions. This study aims at extending the concept of short-term complexity towards the perspective of network physiology, defining multivariate CE measures whereby multiple physiological processes are accounted for in the computation of entropy rates...
November 14, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29135450/influence-of-acquisition-frame-rate-and-video-compression-techniques-on-pulse-rate-variability-estimation-from-vppg-signal
#15
Luca Cerina, Luca Iozzia, Luca Mainardi
In this paper, common time- and frequency-domain variability indexes obtained by pulse rate variability (PRV) series extracted from video-photoplethysmographic signal (vPPG) were compared with heart rate variability (HRV) parameters calculated from synchronized ECG signals. The dual focus of this study was to analyze the effect of different video acquisition frame-rates starting from 60 frames-per-second (fps) down to 7.5 fps and different video compression techniques using both lossless and lossy codecs on PRV parameters estimation...
November 14, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29133522/systolic-blood-pressure-response-in-sprint-systolic-blood-pressure-intervention-trial-and-accord-action-to-control-cardiovascular-risk-in-diabetes-a-possible-explanation-for-discordant-trial-results
#16
Chenxi Huang, Sanket S Dhruva, Andreas C Coppi, Frederick Warner, Shu-Xia Li, Haiqun Lin, Khurram Nasir, Harlan M Krumholz
BACKGROUND: SPRINT (Systolic Blood Pressure Intervention Trial) and the ACCORD (Action to Control Cardiovascular Risk in Diabetes) blood pressure trial used similar interventions but produced discordant results. We investigated whether differences in systolic blood pressure (SBP) response contributed to the discordant trial results. METHODS AND RESULTS: We evaluated the distributions of SBP response during the first year for the intensive and standard treatment groups of SPRINT and ACCORD using growth mixture models...
November 13, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29133477/reproducibility-of-left-ventricular-dimension-versus-area-versus-volume-measurements-in-pediatric-patients-with-dilated-cardiomyopathy
#17
Elif Seda Selamet Tierney, Danielle Hollenbeck-Pringle, Caroline K Lee, Karen Altmann, Carolyn Dunbar-Masterson, Fraser Golding, Minmin Lu, Stephen G Miller, Kimberly Molina, Shobha Natarajan, Carolyn L Taylor, Felicia Trachtenberg, Steven D Colan
BACKGROUND: Multiple echocardiographic methods are used to measure left ventricular size and function. Clinical management is based on individual evaluations and longitudinal trends. The Pediatric Heart Network VVV study (Ventricular Volume Variability) in pediatric patients with dilated cardiomyopathy has reported reproducibility of several of these measures, and how disease state and number of beats impact their reproducibility. In this study, we investigated the impact of observer and sonographer variation on reproducibility of dimension, area, and volume methods to determine the best method for both individual and sequential evaluations...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29133364/day-by-day-variability-of-home-blood-pressure-and-incident-cardiovascular-disease-in-clinical-practice-the-j-hop-study-japan-morning-surge-home-blood-pressure
#18
Satoshi Hoshide, Yuichiro Yano, Hiroyuki Mizuno, Hiroshi Kanegae, Kazuomi Kario
We assessed the relationship between day-by-day home blood pressure (BP) variability and incident cardiovascular disease (CVD) in clinical practice. J-HOP study (Japan Morning Surge-Home Blood Pressure) participants underwent home BP monitoring in the morning and evening for a 14-day period, and their BP levels and BP variability independent of the mean (VIM) were assessed. Incident CVD events included coronary heart disease and stroke. Cox models were fitted to assess the home BP variability-CVD risk association...
November 13, 2017: Hypertension
https://www.readbyqxmd.com/read/29132702/neutrophil-lymphocyte-ratio-prognostic-impact-in-heart-surgery-early-outcomes-and-late-survival
#19
Shuli Silberman, Ulfat Abu-Yunis, Rachel Tauber, Linda Shavit, Tal Grenader, Daniel Fink, Daniel Bitran, Ofer Merin
BACKGROUND: The neutrophil-lymphocyte ratio (NLR) is a recognized marker of inflammation associated with poor outcomes in various clinical situations. We analyzed the prognostic significance of preoperative elevated NLR in patients undergoing cardiac surgery. METHODS: We performed a retrospective review of 3,027 consecutive patients undergoing cardiac surgery. Receiver-operating-characteristic was used to determine the cutoff value for elevated NLR. Multivariate regression was used to determine the predictive value of preoperative NLR on clinical outcomes...
November 10, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29132632/improved-detection-of-congestive-heart-failure-via-probabilistic-symbolic-pattern-recognition-and-heart-rate-variability-metrics
#20
Ruhi Mahajan, Teeradache Viangteeravat, Oguz Akbilgic
OBJECTIVE: A timely diagnosis of congestive heart failure (CHF) is crucial to evade a life-threatening event. This paper presents a novel probabilistic symbol pattern recognition (PSPR) approach to detect CHF in subjects from their cardiac interbeat (R-R) intervals. METHOD: PSPR discretizes each continuous R-R interval time series by mapping them onto an eight-symbol alphabet and then models the pattern transition behavior in the symbolic representation of the series...
December 2017: International Journal of Medical Informatics
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