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Heart variability

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https://www.readbyqxmd.com/read/28918214/efficient-noise-tolerant-estimation-of-heart-rate-variability-using-single-channel-photoplethysmography
#1
Reza Firoozabadi, Eric D Helfenbein, Saeed Babaeizadeh
BACKGROUND: The feasibility of using photoplethysmography (PPG) for estimating heart rate variability (HRV) has been the subject of many recent studies with contradicting results. Accurate measurement of cardiac cycles is more challenging in PPG than ECG due to its inherent characteristics. METHODS: We developed a PPG-only algorithm by computing a robust set of medians of the interbeat intervals between adjacent peaks, upslopes, and troughs. Abnormal intervals are detected and excluded by applying our criteria...
August 18, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28918212/an-%C3%AE-glucosidase-inhibitor-could-reduce-t-wave-alternans-in-type-2-diabetes-patients
#2
Kazuo Eguchi, Takahiro Komori, Toshinobu Saito, Satoshi Hoshide, Kazuomi Kario
BACKGROUND: We tested the hypothesis that an alpha-glucosidase inhibitor (α-GI), miglitol, is effective in protecting the cardiovascular system in type 2 diabetes mellitus (T2DM). METHODS: We studied 19 hospitalized heart disease patients with T2DM in whom we performed continuous glucose monitoring, Holter electrocardiogram, and ambulatory blood pressure (BP) monitoring simultaneously for 48h. The α-GI miglitol was administered for half of the study period by a cross-over fashion...
August 15, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28917495/complications-associated-with-implantable-cardioverter-defibrillators-in-adults-with-congenital-heart-disease-or-left-ventricular-noncompaction-cardiomyopathy-from-the-ncdr-%C3%A2-implantable-cardioverter-defibrillator-registry
#3
Marye J Gleva, Yongfei Wang, Jeptha P Curtis, Charles I Berul, Charles B Huddleston, Jeanne E Poole
Patients with childhood heart disease are living longer and entering adulthood, and may undergo implantable cardioverter-defibrillator (ICD) implantation to reduce the risk of sudden death. We evaluated the characteristics of adult patients with congenital heart disease or left ventricular noncompaction cardiomyopathy (LVNC) in the National Cardiovascular Disease Registry ICD Registry and determined ICD-related in-hospital complications. Patients with LVNC or transposition of the great arteries, tetralogy of Fallot, Ebstein's anomaly, atrial septal defect, ventricular septal defect, or common ventricle were identified in the registry...
August 8, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28916152/effects-of-inspiratory-muscle-training-on-cardiovascular-autonomic-control-a-systematic-review
#4
REVIEW
Raphael Martins de Abreu, Patrícia Rehder-Santos, Vinicius Minatel, Gabriela Lopes Dos Santos, Aparecida Maria Catai
PURPOSE: To carry out a systematic review to determine if inspiratory muscle training (IMT) promotes changes in cardiovascular autonomic responses in humans. METHODS: The methodology followed the PRISMA statement for reporting systematic review analysis. MEDLINE, PEDro, SCOPUS and PubMed electronic databases were searched from the inception to March 2017. The quality assessment was performed using a PEDro scale. The articles were included if: (1) primary objective was related to the effects of IMT on the cardiovascular autonomic nervous system, and (2) randomized clinical trials and quasi-experimental studies...
September 7, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28915957/modulation-of-heart-rate-and-heart-rate-variability-by-n-3-long-chain-polyunsaturated-fatty-acids-speculation-on-mechanism-s
#5
Merritt L Drewery, Steven B Spedale, Carol J Lammi-Keefe
Heart rate (HR) and heart rate variability (HRV) are valuable markers of health. Although the underlying mechanism(s) are controversial, it is well documented that n-3 long chain polyunsaturated fatty acid (LCPUFA) intake improves HR and HRV in various populations. Autonomic modulation and/or alterations in cardiac electrophysiology are commonly cited as potential mechanisms responsible for these effects. This article reviews existing evidence for each and explores a separate mechanism which has not received much attention but has scientific merit...
September 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28915915/nocturnal-heart-rate-variability-in-1-year-old-infants-analyzed-by-using-the-least-square-cosine-spectrum-method
#6
Yuko Kochiya, Akari Hirabayashi, Yuhei Ichimaru
BACKGROUND: To evaluate the dynamic nature of nocturnal heart rate variability, RR intervals recorded with a wearable heart rate sensor were analyzed using the Least Square Cosine Spectrum Method. METHODS: Six 1-year-old infants participated in the study. A wearable heart rate sensor was placed on their chest to measure RR intervals and 3-axis acceleration. Heartbeat time series were analyzed for every 30 s using the Least Square Cosine Spectrum Method, and an original parameter to quantify the regularity of respiratory-related heart rate rhythm was extracted and referred to as "RA (RA-COSPEC: Respiratory Area obtained by COSPEC)...
September 16, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28914638/long-term-risk-and-predictors-of-cardiovascular-death-in-stable-coronary-artery-disease-the-coronor-study
#7
Christophe Bauters, Olivier Tricot, Thibaud Meurice, Nicolas Lamblin
BACKGROUND: There is limited knowledge on the residual risk of cardiovascular death (CVD) in patients with stable coronary artery disease (CAD) who receive modern secondary prevention. Our aim was to analyze the causes of death and to determine predictors of CVD in the 5-year CORONOR registry. METHODS: We studied 4184 consecutive CAD outpatients who were free from any myocardial infarction (MI) or coronary revascularization for more than 1 year at inclusion. Antithrombotics were prescribed in 99%, statins in 92%, inhibitors of renin-angiotensin system in 82%, and β-blockers in 79%; 86% had prior coronary revascularization...
September 13, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28913826/modeling-tolerance-development-for-the-effect-on-heart-rate-of-the-selective-s1p1-receptor-modulator-ponesimod
#8
Dominik Lott, Thorsten Lehr, Jasper Dingemanse, Andreas Krause
Ponesimod is a selective sphingosine-1-phosphate-1 (S1P1 ) receptor modulator currently under investigation for the treatment of multiple sclerosis. S1P receptor modulators reduce heart rate following treatment initiation. This effect disappears with repeated dosing, enabling development of innovative up-titration regimens to optimize patient safety. There are currently no published pharmacokinetic/pharmacodynamic models describing the heart rate reduction of S1P receptor modulators in humans. The model developed here provides quantification of this effect for ponesimod...
September 15, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28912910/prognostic-significance-of-elevated-cardiac-troponin-in-acute-gastrointestinal-bleeding
#9
Umair Iqbal, Osama Siddique, Ayesha Jameel, Hafsa Anwar, Ahmad Chaudhary
BACKGROUND: Acute gastrointestinal bleeding (AGIB) is responsible for over 140,000 hospitalizations annually. Cardiovascular-related deaths account for 30% of the patients surviving the initial episode of AGIB. The purpose of this study was to identify the impact of elevated troponin on short-term mortality and length of stay (LOS) of these patients. METHODS: From July 2013 to July 2016, 290 patients admitted with a diagnosis of AGIB and who had cardiac troponin I measured within 24 h of presentation were retrospectively reviewed...
August 2017: Gastroenterology Research
https://www.readbyqxmd.com/read/28912727/a-hybrid-emd-kurtosis-method-for-estimating-fetal-heart-rate-from-continuous-doppler-signals
#10
Haitham M Al-Angari, Yoshitaka Kimura, Leontios J Hadjileontiadis, Ahsan H Khandoker
Monitoring of fetal heart rate (FHR) is an important measure of fetal wellbeing during the months of pregnancy. Previous works on estimating FHR variability from Doppler ultrasound (DUS) signal mainly through autocorrelation analysis showed low accuracy when compared with heart rate variability (HRV) computed from fetal electrocardiography (fECG). In this work, we proposed a method based on empirical mode decomposition (EMD) and the kurtosis statistics to estimate FHR and its variability from DUS. Comparison between estimated beat-to-beat intervals using the proposed method and the autocorrelation function (AF) with respect to RR intervals computed from fECG as the ground truth was done on DUS signals from 44 pregnant mothers in the early (20 cases) and late (24 cases) gestational weeks...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28912591/inter-individual-differences-in-heart-rate-variability-are-associated-with-inter-individual-differences-in-mind-reading
#11
Alexander Lischke, Daniela Lemke, Jörg Neubert, Alfons O Hamm, Martin Lotze
In the present study, we investigated whether inter-individual differences in vagally-mediated cardiac activity (high frequency heart rate variability, HF-HRV) would be associated with inter-individual differences in mind-reading, a specific aspect of social cognition. To this end, we recorded resting state HF-HRV in 49 individuals before they completed the Reading the Mind in the Eyes Test, a test that required the identification of mental states on basis of subtle facial cues. As expected, inter-individual differences in HF-HRV were associated with inter-individual differences in mental state identification: Individuals with high HF-HRV were more accurate in the identification of positive but not negative states than individuals with low HF-HRV...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912040/inaccuracy-of-right-atrial-pressure-estimates-through-inferior-vena-cava-indices
#12
Corrado Magnino, Pierluigi Omedè, Eleonora Avenatti, Davide Presutti, Andrea Iannaccone, Michela Chiarlo, Claudio Moretti, Fiorenzo Gaita, Franco Veglio, Alberto Milan
The precision of echocardiography in estimating pulmonary pressures has been debated. A value of right atrial pressure (RAP) is needed for pulmonary pressure estimation, and it could be partly responsible for the estimation error. Several schemes based on the inferior vena cava (IVC) are commonly used in clinical practice and in experimental studies for RAP estimation. However, the majority lack proper validation, and thus far, no study has compared them all. In this prospective, blinded study, a comprehensive transthoracic echocardiography was performed on 200 patients referred for right heart catheterization...
July 31, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28911308/why-not-all-hypertensive-patients-are-tachycardic-at-rest
#13
Maciej Siński, Piotr Jędrusik, Jacek Lewandowski
BACKGROUND: The importance of increased resting heart rate in hypertensive patients was highlighted in the European Society of Hypertension statement on the identification and management of hypertensive patient with elevated heart rate. METHODS: Review of the available literature. RESULTS: Increased heart rate is an independent predictor of cardiovascular morbidity and mortality even after adjustment for other conventional cardiovascular risk factors...
June 7, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28911179/deciphering-the-function-of-the-blunt-circadian-rhythm-of-melatonin-in-the-newborn-lamb-impact-on-adrenal-and-heart
#14
Maria Seron-Ferre, Claudia Torres-Farfan, Francisco J Valenzuela, Sebastian Castillo-Galan, Auristela Rojas, Natalia Mendez, Henry Reynolds, Guillermo J Valenzuela, Anibal J Llanos
Neonatal lambs, as with human and other neonates, have low arrhythmic endogenous levels of melatonin for several weeks until they start their own pineal rhythm of melatonin production at approximately 2 weeks of life. During pregnancy, daily rhythmic transfer of maternal melatonin to the fetus has important physiological roles in sheep, nonhuman primates, and rats. This melatonin rhythm provides a circadian signal and also participates in adjusting the physiology of several organs in preparation for extrauterine life...
September 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28910541/seasonal-variability-of-nt-probnp-in-swedish-primary-care-patients
#15
Banafsheh Seyyed Khezri, Maria Cederblad, Johanna Helmersson-Karlqvist, Bo Karlsson, Håkan Melhus, Anders Larsson
The aim of this study was to determine if there is a seasonal variation in the widely used heart failure marker NT-proBNP. The study included all primary care requests for NT-proBNP in the county of Uppsala, Sweden, between January 2007 and December 2015. For seasonal variation, the NT-proBNP results for individual months were compared. The NT-proBNP values were highest in July to September, but there was also a minor peak in December-January. In conclusion, a seasonal periodicity for NT-proBNP was demonstrated in primary care patients...
September 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28910353/reference-equations-for-the-six-minute-walk-distance-in-the-healthy-chinese-population-aged-18-59-years
#16
He Zou, Xiuruo Zhu, Jia Zhang, Yi Wang, Xiaozhen Wu, Fang Liu, Xiaofeng Xie, Xiaoshu Chen
BACKGROUND: The six-minute walk test (6MWT) is a safe, simple, inexpensive tool for evaluating the functional exercise capacity of patients with chronic respiratory disease. However, there is a lack of standard reference equations for the six-minute walk distance (6MWD) in the healthy Chinese population aged 18-59 years. AIMS: The purposes of the present study were as follows: 1) to measure the anthropometric data and walking distance of a sample of healthy Chinese Han people aged 18-59 years; 2) to construct reference equations for the 6MWD; 3) to compare the measured 6MWD with previously published equations...
2017: PloS One
https://www.readbyqxmd.com/read/28906306/predicting-early-mortality-following-hip-fracture-surgery-the-hip-fracture-estimator-of-mortality-amsterdam-hema
#17
Julian Karres, Noera Kieviet, Jan-Peter Eerenberg, Bart C Vrouenraets
OBJECTIVES: Early mortality following hip fracture surgery is high and pre-operative risk assessment for the individual patient is challenging. A risk model could identify patients in need of more intensive perioperative care, provide insight in the prognosis and allow for risk-adjustment in audits. This study aimed to develop and validate a risk prediction model for 30-day mortality following hip fracture surgery: the Hip fracture Estimator of Mortality Amsterdam (HEMA). METHODS: Data on 1050 consecutive patients undergoing hip fracture surgery between 2004 and 2010 were retrospectively collected and randomly split into a development cohort (746 patients) and validation cohort (304 patients)...
September 11, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28906129/perceptions-of-u-s-veterans-affairs-and-community-healthcare-providers-regarding-cross-system-care-for-heart-failure
#18
Charlene A Pope, Boyd H Davis, Leticia Wine, Lynne S Nemeth, K Sue Haddock, Tom Hartney, R Neal Axon
Objectives This study explores perceptions of US Veterans Affairs (VA) and non-VA healthcare providers caring for Veterans with heart failure (HF) regarding Veteran knowledge and motivations for dual use, provider roles in recommending and coordinating dual use, systems barriers and facilitators, and suggestions for improving cross-system care. Methods Twenty VA and 11 non-VA providers participated in semi-structured interviews, which were analyzed using parallel qualitative content and discourse analysis. Results VA and non-VA providers described variable HF knowledge and self-management among Veterans, and both groups described the need for improved education addressing medication adherence, self-care, and management of acute symptoms...
January 1, 2017: Chronic Illness
https://www.readbyqxmd.com/read/28905397/alcohol-advertising-in-magazines-and-underage-readership-are-underage-youth-disproportionately-exposed
#19
Charles King, Michael Siegel, Craig S Ross, David H Jernigan
BACKGROUND: The question of whether underage youth are disproportionately exposed to alcohol advertising lies at the heart of the public health debate about whether restrictions on alcohol advertising are warranted. The aim of this study was to determine whether alcohol brands popular among underage (ages 12 to 20 years) drinkers ("underage brands") are more likely than others ("other brands") to advertise in magazines with high underage readerships. METHODS: We analyze the advertising of 680 alcohol brands in 49 magazines between 2006 and 2011...
September 13, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28904845/biomarker-for-the-prediction-of-major-adverse-cardiac-events-in-patients-with-non-st-segment-elevation-myocardial-infarction
#20
REVIEW
Ho Sun Shon, Jang-Whan Bae, Kyoung Ok Kim, Eun Jong Cha, Kyung Ah Kim
N-terminal pro-brain natriuretic peptide (NT-proBNP) is a well-known biomarker for the diagnosis and prognosis of heart failure, and is directly associated with myocardial dysfunction. We evaluated the prognostic value of NT-proBNP for major adverse cardiac events (MACEs) among patients with non-ST-segment elevation myocardial infarction (NSTEMI) from the Korea Acute Myocardial Infarction Registry during their mid-term follow-up period. In this paper, we analyzed NT-proBNP according to various MACE and level of NT-proBNP...
August 2017: Osong Public Health and Research Perspectives
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