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Electrocardiography

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https://www.readbyqxmd.com/read/28350715/continuous-cardiac-autonomic-and-haemodynamic-responses-to-isometric-exercise
#1
Katrina A Taylor, Jonathan D Wiles, Damian D Coleman, Rajan Sharma, Jamie M O'Driscoll
PURPOSE: Elevated arterial blood pressure (BP) is associated with autonomic dysfunction and impaired haemodynamic control mechanisms. Isometric exercise (IE) training has been demonstrated effective at reducing BP; however, the continuous cardiovascular responses during IE are underinvestigated. We hypothesized that reflex autonomic cardiovascular control is an important mediator in reducing BP. To test our hypothesis, we investigated continuous cardiac autonomic modulation and baroreceptor reflex sensitivity (BRS) in response to IE...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28341355/comparison-of-clinical-and-electrocardiographic-predictors-of-ischemic-and-nonischemic-cardiomyopathy-during-the-initial-evaluation-of-patients-with-reduced-%C3%A2-40-left-ventricular-ejection-fraction
#2
Nathaniel R Smilowitz, Arvind R Devanabanda, George Zakhem, Sohah N Iqbal, William Slater, John T Coppola
Invasive coronary angiography is routinely performed during the initial evaluation of patients with suspected cardiomyopathy with reduced left ventricular function. Clinical and electrocardiographic (ECG) data may accurately predict ischemic cardiomyopathy (IC). Medical records of adults referred for coronary angiography for evaluation of left ventricular ejection fraction ≤40% from 2010 to 2014 were retrospectively reviewed. Patients with myocardial infarction (MI), previous coronary revascularization, cardiac surgery, or left-sided valvular disease were excluded...
March 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28334922/scn2a-deletion-improves-survival-and-brain-heart-dynamics-in-the-kcna1-null-mouse-model-of-sudden-unexpected-death-in-epilepsy-sudep
#3
Vikas Mishra, Bharat K Karumuri, Nicole M Gautier, Rui Liu, Timothy N Hutson, Stephanie L Vanhoof-Villalba, Ioannis Vlachos, Leonidas Iasemidis, Edward Glasscock
People with epilepsy have greatly increased probability of premature mortality due to sudden unexpected death in epilepsy (SUDEP). Identifying which patients are most at risk of SUDEP is hindered by a complex genetic etiology, incomplete understanding of the underlying pathophysiology, and lack of prognostic biomarkers. Here we evaluated heterozygous Scn2a gene deletion (Scn2a+/-) as a protective genetic modifier in the Kcna1 knockout mouse (Kcna1-/-) model of SUDEP, while searching for biomarkers of SUDEP risk embedded in electroencephalography (EEG) and electrocardiography (ECG) recordings...
March 15, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28321519/cardiac-autonomic-function-in-type-1-and-type-2-myotonic-dystrophy
#4
Piotr Bienias, Anna Łusakowska, Michał Ciurzyński, Zuzanna Rymarczyk, Katarzyna Irzyk, Michał Konwerski, Kamil Ciąpała, Paweł Kowalski, Anna Kamińska, Piotr Pruszczyk
OBJECTIVE: The aim of this study was to evaluate cardiac autonomic nervous system function using Holter-derived and standard electrocardiographic parameters in patients with myotonic dystrophy (dystrophia myotonica, DM) and no clinically overt heart involvement. METHODS: Eighty-four DM patients without conditions potentially influencing cardiac autonomic function were enrolled in the study: 44 with DM type 1 and 40 with DM type 2 (mean age 34.9 ± 11.5 and 47...
March 20, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28320746/race-and-sex-differences-in-qrs-interval-and-associated-outcome-among-patients-with-left-ventricular-systolic-dysfunction
#5
Tiffany C Randolph, Samuel Broderick, Linda K Shaw, Karen Chiswell, Robert J Mentz, Valentina Kutyifa, Eric J Velazquez, Francis R Gilliam, Kevin L Thomas
BACKGROUND: Prolonged QRS duration is associated with increased mortality among heart failure patients, but race or sex differences in QRS duration and associated effect on outcomes are unknown. METHODS AND RESULTS: We investigated QRS duration and morphology among 2463 black and white patients with heart failure and left ventricular ejection fraction ≤35% who underwent coronary angiography and 12-lead electrocardiography at Duke University Hospital from 1995 through 2011...
March 20, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28317848/polyphonic-sonification-of-electrocardiography-signals-for-diagnosis-of-cardiac-pathologies
#6
Jakob Nikolas Kather, Thomas Hermann, Yannick Bukschat, Tilmann Kramer, Lothar R Schad, Frank Gerrit Zöllner
Electrocardiography (ECG) data are multidimensional temporal data with ubiquitous applications in the clinic. Conventionally, these data are presented visually. It is presently unclear to what degree data sonification (auditory display), can enable the detection of clinically relevant cardiac pathologies in ECG data. In this study, we introduce a method for polyphonic sonification of ECG data, whereby different ECG channels are simultaneously represented by sound of different pitch. We retrospectively applied this method to 12 samples from a publicly available ECG database...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317823/-functional-cardiovascular-assessment-in-dentists-performing-local-anesthesia-in-out-patient-settings
#7
S A Rabinovich, S N Razumova, Yu L Vasil'ev
The article presents the results of the cardiovascular changes assessment using electrocardiography (ECG) monitoring during local anesthesia in GP dentists. Selective ECG monitoring was carried out in 60 dentists aged 25-55 years (1 group - 25-34 y.o.; 2 group - 35-44 y.o.; 3 group - 45-55 y.o.) by means of portable «Valens» system. The study of stress index or the index of regulatory systems tension (IT) was conducted for 6 hours in the first day half within 1 working day. IT from 50 to 150 relative units was considered normal...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28315565/heart-rate-variability-in-normal-weight-patients-with-polycystic-ovary-syndrome
#8
Celal Kilit, Türkan Paşalı Kilit
OBJECTIVE: Polycystic ovary syndrome (PCOS) is an endocrine disease closely related to several risk factors of cardiovascular disease. Obese women with PCOS show altered autonomic modulation. The results of studies investigating cardiac autonomic functions of normal-weight women with PCOS are conflicting. The aim of the study was to assess the reactivity of cardiac sympathovagal balance in normal-weight women with PCOS by heart rate variability analysis. METHODS: We examined the heart rate variability in 60 normal-weight women with PCOS and compared them with that in 60 age-matched healthy women having a similar metabolic profile...
March 9, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28303846/heart-rate-variability-in-patients-with-acute-ischemic-stroke-at-different-stages-of-renal-dysfunction-a-cross-sectional-observational-study
#9
Lin Wei, Wen-Bo Zhao, Huan-Wen Ye, Yan-Hua Chen, Xiao-Pei Zhang, Yan Huang, Ye-Feng Cai, Quan-Fu Chen, Su-Yue Pan
BACKGROUND: Renal function is associated with mortality and functional disabilities in stroke patients, and impaired autonomic function is common in stroke, but little is known regarding its effects on stroke patients with renal dysfunction. This study sought to evaluate the association between autonomic function and stroke in patients with renal dysfunction. METHODS: This study comprised 232 patients with acute ischemic stroke consecutively enrolled from February 2013 to November 2014 at Guangdong Provincial Hospital of Chinese Medicine in China...
March 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28303667/exercise-induced-saphenous-vein-graft-spasm-prevented-by-stenting
#10
William G Boliek, Dean J Kereiakes, Atul Chugh
Recurrence of anginal symptoms following coronary artery bypass surgery is usually secondary to graft closure or progression of native vessel disease. The present case demonstrates severe exercise-induced saphenous vein graft (SVG) spasm associated with transmural ischemia refractory to maximal vasodilator therapy. Symptoms resolved and exercise electrocardiography normalized following stenting of SVG regions demonstrating spasm. © 2017 Wiley Periodicals, Inc.
March 17, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28298397/predictors-of-obstructive-sleep-apnoea-in-patients-admitted-for-acute-coronary-syndrome
#11
Jordi de Batlle, Cecilia Turino, Alicia Sánchez-de-la-Torre, Jorge Abad, Joaquín Duran-Cantolla, R Douglas McEvoy, Nick A Antic, Olga Mediano, Valentín Cabriada, Maria José Masdeu, Joaquín Teran, Joan Valls, Ferran Barbé, Manuel Sánchez-de-la-Torre
Identifying undiagnosed obstructive sleep apnoea (OSA) patients in cardiovascular clinics could improve their management. Aiming to build an OSA predictive model, a broad analysis of clinical variables was performed in a cohort of acute coronary syndrome (ACS) patients.Sociodemographic, anthropometric, life-style and pharmacological variables were recorded. Clinical measures included blood pressure, electrocardiography, echocardiography, blood count, troponin levels and a metabolic panel. OSA was diagnosed using respiratory polygraphy...
March 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28296900/wireless-transmission-of-biosignals-for-hyperbaric-chamber-applications
#12
Carlos Perez-Vidal, Luis Gracia, Cristian Carmona, Bartomeu Alorda, Antonio Salinas
This paper presents a wireless system to send biosignals outside a hyperbaric chamber avoiding wires going through the chamber walls. Hyperbaric chambers are becoming more and more common due to new indications of hyperbaric oxygen treatments. Metallic walls physically isolate patients inside the chamber, where getting a patient's vital signs turns into a painstaking task. The paper proposes using a ZigBee-based network to wirelessly transmit the patient's biosignals to the outside of the chamber. In particular, a wearable battery supported device has been designed, implemented and tested...
2017: PloS One
https://www.readbyqxmd.com/read/28296760/fluctuations-in-the-amplitude-of-st-segment-elevation-in-vasospastic-angina-two-case-reports
#13
Ming-Jui Hung
RATIONALE: ST-segment elevation localizes an ischemic lesion to the coronary artery supplying the area of the myocardium reflected by the electrocardiographic leads. Dynamic ST-segment elevation can be due to severe transmural ischemia secondary to a thrombus, vasospasm, or a tightly fixed coronary artery lesion or a combination of these situations. PATIENT CONCERNS: In this study, we report on two patients with angina who had fluctuations in ST-segment amplitude on serial electrocardiograms...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28290720/comparison-of-heart-rate-variability-recording-with-smart-phone-photoplethysmographic-polar-h7-chest-strap-and-electrocardiogram-methods
#14
Daniel J Plews, Ben Scott, Marco Altini, Matt Wood, Andrew E Kilding, Paul B Laursen
PURPOSE: To establish the validity of smartphone photoplethysmography (PPG) and heart rate sensor in the measurement of heart rate variability (HRV). METHODS: 29 healthy subjects were measured at rest during 5 min of guided breathing (GB) and normal breathing (NB) using Smartphone PPG, heart rate chest strap and electrocardiography (ECG). The root mean sum of the squared differences between R-R intervals (rMSSD) was determined from each device. RESULTS: Compared to ECG, the technical error of estimate (TEE) was acceptable for all conditions (average TEE CV% (90% CI) = 6...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290647/syncope-evaluation-and-differential-diagnosis
#15
Lloyd A Runser, Robert L Gauer, Alex Houser
Syncope is an abrupt and transient loss of consciousness caused by cerebral hypoperfusion. It accounts for 1% to 1.5% of emergency department visits, resulting in high hospital admission rates and significant medical costs. Syncope is classified as neurally mediated, cardiac, and orthostatic hypotension. Neurally mediated syncope is the most common type and has a benign course, whereas cardiac syncope is associated with increased morbidity and mortality. Patients with presyncope have similar prognoses to those with syncope and should undergo a similar evaluation...
March 1, 2017: American Family Physician
https://www.readbyqxmd.com/read/28290631/acute-coronary-syndrome-current-treatment
#16
Timothy L Switaj, Scott R Christensen, Dean M Brewer
Acute coronary syndrome continues to be a significant cause of morbidity and mortality in the United States. Family physicians need to identify and mitigate risk factors early, as well as recognize and respond to acute coronary syndrome events quickly in any clinical setting. Diagnosis can be made based on patient history, symptoms, electrocardiography findings, and cardiac biomarkers, which delineate between ST elevation myocardial infarction and non-ST elevation acute coronary syndrome. Rapid reperfusion with primary percutaneous coronary intervention is the goal with either clinical presentation...
February 15, 2017: American Family Physician
https://www.readbyqxmd.com/read/28290487/cardiac-autonomic-alteration-and-metabolic-syndrome-an-ambulatory-ecg-based-study-in-a-general-population
#17
Yan Ma, Ping-Huei Tseng, Andrew Ahn, Ming-Shiang Wu, Yi-Lwun Ho, Ming-Fong Chen, Chung-Kang Peng
Metabolic syndrome (MetS) has been associated with chronic damage to the cardiovascular system. This study aimed to evaluate early stage cardiac autonomic dysfunction with electrocardiography (ECG)-based measures in MetS subjects. During 2012-2013, 175 subjects with MetS and 226 healthy controls underwent ECG recordings of at least 4 hours starting in the morning with ambulatory one-lead ECG monitors. MetS was diagnosed using the criteria defined in the Adult Treatment Panel III, with a modification of waist circumference for Asians...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28290164/risk-factors-for-permanent-pacemaker-after-implantation-of-surgical-or-percutaneous-self-expanding-aortic-prostheses
#18
Emmanuel Villa, Alberto Clerici, Antonio Messina, Luca Testa, Francesco Bedogni, Andrea Moneta, Francesco Donatelli, Giovanni Troise
BACKGROUND: The use of transcatheter aortic valve implantation (TAVI) following the introduction of Nitinol autoexpandable devices has spread rapidly during recent years. In addition, cardiac surgery has been revolutionized due to the use of Nitinol-based sutureless prostheses for aortic valve replacement (AVR). During the same period, however, permanent pacemaker (PPM) implantation has emerged as a frequent complication. The study aim was to identify the risk factors of PPM following the implantation of a Nitinol self-expanding prosthesis (for AVR or TAVI)...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28289645/accuracy-of-heart-rate-measurement-using-smartphones-during-treadmill-exercise-in-male-patients-with-ischemic-heart-disease
#19
Eun Sun Lee, Jin Seok Lee, Min Cheol Joo, Ji Hee Kim, Se Eung Noh
OBJECTIVE: To evaluate the accuracy of a smartphone application measuring heart rates (HRs), during an exercise and discussed clinical potential of the smartphone application for cardiac rehabilitation exercise programs. METHODS: Patients with heart disease (14 with myocardial infarction, 2 with angina pectoris) were recruited. Exercise protocol was comprised of a resting stage, Bruce stage II, Bruce stage III, and a recovery stage. To measure HR, subjects held smartphone in their hands and put the tip of their index finger on the built-in camera for 1 minute at each exercise stage such as resting stage, Bruce stage II, Bruce stage III, and recovery stage...
February 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28288480/the-effect-of-heart-rate-on-exposure-window-and-best-phase-for-stress-perfusion-computed-tomography-lessons-from-the-core320-study
#20
Chloe Steveson, Joanne D Schuijf, Andrea L Vavere, Richard T Mather, Teresa Caton, Vishal Mehra, Aisha Betoko, Christopher Cox, Joao Ac Lima, Richard T George
OBJECTIVES: The aim of this study is to evaluate the effect of heart rate on exposure window, best phase, and image quality for stress computed tomography perfusion (CTP) in the CORE320 study. METHODS: The CTP data sets were analyzed to determine the best phase for perfusion analysis. A predefined exposure window covering 75% to 95% of the R-R cycle was used. RESULTS: Of the 368 patients included in the analysis, 93% received oral β blockade before the rest scan...
March 2017: Journal of Computer Assisted Tomography
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