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https://www.readbyqxmd.com/read/29454286/the-vasodilatory-effect-of-allopurinol-mediates-its-antihypertensive-effect-effects-on-calcium-movement-and-cardiac-hemodynamics
#1
Hany M El-Bassossy, Mona F Mahmoud, Basma G Eid
Despite the reported reduction in blood pressure in hypertensive patients treated with allopurinol, the mechanism of the allopurinol hypotensive effect is still unclear. In the current study, the hypotensive effect of allopurinol has been fully investigated in hypertensive rats. Hypertension was induced in rats by angiotensin II (120 ng/min/kg) infusion for two weeks. Rats were then subjected to real-time recording of blood pressure, left ventricular pressure and volume and surface ECG. After 10 min of basal recording, allopurinol was slowly injected into the femoral vein with a dose of 10 μmole/kg...
February 14, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29453408/biosignals-reflect-pair-dynamics-in-collaborative-work-eda-and-ecg-study-of-pair-programming-in-a-classroom-environment
#2
Lauri Ahonen, Benjamin Ultan Cowley, Arto Hellas, Kai Puolamäki
Collaboration is a complex phenomenon, where intersubjective dynamics can greatly affect the productive outcome. Evaluation of collaboration is thus of great interest, and can potentially help achieve better outcomes and performance. However, quantitative measurement of collaboration is difficult, because much of the interaction occurs in the intersubjective space between collaborators. Manual observation and/or self-reports are subjective, laborious, and have a poor temporal resolution. The problem is compounded in natural settings where task-activity and response-compliance cannot be controlled...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29452744/emerging-concepts-in-diagnosis-and-treatment-of-syncope-by-pacing
#3
REVIEW
Richard Sutton, Jean-Claude Deharo, Michele Brignole, Mohamed H Hamdan
Neuroendocrine syncope is a newly proposed term to embody both syncope of reflex and adenosine-related etiology. Recent publications on tilt testing have revealed the presence of a hypotensive tendency in some patients, even in the face of severe cardioinhibition. This new understanding may allow better selection of older reflex syncope patients, documented by ECG loop recorder, for successful pacing where tilt testing is ideally negative for a good result in terms of few syncope recurrences and prompts a less aggressive management policy when hypotensive medication is required...
February 13, 2018: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29451501/transitions-in-physiological-coupling-between-heartbeat-and-pulse-across-sleep-stages
#4
Qianli D Y Ma, Changjuan Ji, Huanhuan Xie, Kai Yin, Zhen Ma, Chunhua Bian
The aim of this study is to investigate the coupling behavior between heartbeat and pulse of blood flow at different sleep stages, and to explore the feasibility of using this coupling strength for automatic sleep staging.
 Approach: The electrocardiogram (ECG) and photoplethysmography (PPG) signals are recorded during sleep, and R-wave-to-R-wave intervals (RRI) and Pulse-to-Pulse intervals (PPI) are extracted respectively. The detrended cross-correlation analysis (DCCA) is applied to quantify long-range cross correlations between the RRIs and PPIs across sleep stages...
February 16, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29450695/a-clinical-approach-to-arrhythmias-revisited-in-2018-from-ecg-over-noninvasive-and-invasive-electrophysiology-to-advanced-imaging
#5
REVIEW
L Jordaens
Understanding arrhythmias and their treatment is not always easy. The current straightforward approach with catheter ablation and device therapy is an amazing achievement, but does not make management of underlying or other cardiac disease and pharmacological therapy unnecessary. The goal of this paper is to describe how much of the knowledge of the 1980s and early 1990s can and should still be applied in the modern treatment of patients with arrhythmias. After an introduction, this review will focus on paroxysmal atrial fibrillation and a prototype of 'idiopathic' ventricular arrhythmias, two diseases with a striking similarity, and will discuss the arrhythmogenesis...
February 15, 2018: Netherlands Heart Journal
https://www.readbyqxmd.com/read/29450627/can-the-use-of-a-single-integrated-unitary-autonomic-index-provide-early-clues-for-eventual-eligibility-for-olympic-games
#6
Daniela Lucini, Roberto Sala, Antonio Spataro, Mara Malacarne, Manuela Benzi, Stefano Tamorri, Massimo Pagani
PURPOSE: Optimal autonomic regulation and stress resilience might be considered critical elements of athletic performance. We hypothesize that a novel unitary autonomic index for sports (ANSIs), together with a somatic stress related symptom score (4SQ) might help characterize athletes who were eventually selected for the Rio 2016 Olympic Games Italian team (Rio +). METHODS: In this retrospective study we examined 778 athletes (age 24.4 ± 6.7 yrs) who underwent a planned yearly pre-participation screening...
February 15, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29450560/-ecg-results-tips-and-tricks-for-the-correct-diagnosis-bradycardia-and-tachycardia-rhythm-disorders
#7
H-J Trappe
The 12-lead surface electrocardiogram (ECG) is of great importance for the diagnostics of cardiac arrhythmias. For the correct and systematic analysis it has a sensitivity and specificity for the correct diagnosis of supraventricular tachycardia or ventricular tachycardia of more than 95%. Nevertheless, the assessment of cardiac rhythm disorders is difficult for many physicians. In this way errors can occur, frequently due to a non-systematic analysis of the ECG; therefore, the aim of this article is to present the techniques and the necessary knowledge for assessment of the most frequent bradycardiac and tachycardiac heart rhythm disorders...
February 15, 2018: Herz
https://www.readbyqxmd.com/read/29449353/ten-year-clinical-outcome-after-circumferential-pulmonary-vein-isolation-utilizing-the-hamburg-approach-in-patients-with-symptomatic-drug-refractory-paroxysmal-atrial-fibrillation
#8
Roland Richard Tilz, Christian-Hendrik Heeger, Alexander Wick, Ardan M Saguner, Andreas Metzner, Andreas Rillig, Peter Wohlmuth, Bruno Reissmann, Christine Lemeš, Tilman Maurer, Francesco Santoro, Johannes Riedl, Christian Sohns, Shibu Mathew, Karl-Heinz Kuck, Feifan Ouyang
BACKGROUND: Circumferential pulmonary vein isolation (CPVI) is increasingly performed for the treatment of symptomatic drug-refractory paroxysmal atrial fibrillation. Long-term data for >10 years after CPVI are sparse. We investigated the long-term clinical outcome and progression of paroxysmal atrial fibrillation after double-lasso and 3-dimensional electroanatomical mapping-guided CPVI. METHODS AND RESULTS: From 2003 to 2004, 161 patients (mean age: 60±10 years) with symptomatic drug-refractory paroxysmal atrial fibrillation were prospectively enrolled and underwent electroanatomical mapping-guided CPVI...
February 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29447999/late-heartbeat-evoked-potentials-are-associated-with-survival-after-cardiac-arrest
#9
André Schulz, Pascal Stammet, Angelika M Dierolf, Claus Vögele, Stefan Beyenburg, Christophe Werer, Yvan Devaux
RATIONALE: Cardiac arrest (CA) is a serious condition characterized by high mortality rates, even after initial successful resuscitation, mainly due to neurological damage. Whether brain-heart communication is associated with outcome after CA is unknown. Heartbeat-evoked brain potentials (HEPs) represent neurophysiological indicators of brain-heart communication. The aim of this study was to address the association between HEPs and survival after CA. METHODS: HEPs were calculated from resting EEG/ECG in 55 CA patients 24 hours after resuscitation...
February 12, 2018: Resuscitation
https://www.readbyqxmd.com/read/29447789/comprehensive-electrocardiogram-to-device-time-for-primary-percutaneous-coronary-intervention-in-st-segment-elevation-myocardial-infarction-a-report-from-the-american-heart-association-mission-lifeline-program
#10
Jay S Shavadia, William French, Anne S Hellkamp, Laine Thomas, Eric R Bates, Steven V Manoukian, Michael C Kontos, Robert Suter, Timothy D Henry, Harold L Dauerman, Matthew T Roe
BACKGROUND: Assessing hospital-related network-level primary percutaneous coronary intervention (PCI) performance for ST-segment elevation myocardial infarction (STEMI) is challenging due to differential time-to-treatment metrics based on location of diagnostic electrocardiogram (ECG) for STEMI. METHODS: STEMI patients undergoing primary PCI at 588 PCI-capable hospitals in AHA Mission: Lifeline (2008-2013) were categorized by initial STEMI identification location: PCI-capable hospitals (Group 1); pre-hospital setting (Group 2); and non-PCI-capable hospitals (Group 3)...
March 2018: American Heart Journal
https://www.readbyqxmd.com/read/29447784/design-of-disco-direct-or-subacute-coronary-angiography-in-out-of-hospital-cardiac-arrest-study
#11
Rickard Lagedal, Ludvig Elfwén, Stefan James, Jonas Oldgren, David Erlinge, Ollie Östlund, Ewa Wallin, Ing-Marie Larsson, Gisela Lilja, Tobias Cronberg, Sten Rubertsson, Per Nordberg
BACKGROUND: Acute coronary syndrome is a common cause of out-of-hospital cardiac arrest (OHCA). In patients with OHCA presenting with ST elevation, immediate coronary angiography and potential percutaneous coronary intervention (PCI) after return of spontaneous circulation are recommended. However, the evidence for this invasive strategy in patients without ST elevation is limited. Observational studies have shown a culprit coronary artery occlusion in about 30% of these patients, indicating the electrocardiogram's (ECG's) limited sensitivity...
March 2018: American Heart Journal
https://www.readbyqxmd.com/read/29447081/is-neuropathic-pain-associated-with-cardiac-sympathovagal-activity-changes-in-patients-with-breast-cancer
#12
Hilal Yesil, Sibel Eyigor, Meral Kayıkcıoglu, Ruchan Uslu, Menekse Inbat, Benay Ozbay
Objective Heart rate variability (HRV) is a good indicator of the autonomic nervous system (ANS) activity. A few studies have been conducted recently and have shown a relationship between reduced HRV and conditions that lead to neuropathic pain (NP). In this study, we aimed to investigate whether NP is associated with changes in cardiac sympathovagal activity in patients with breast cancer (BC). Methods We used the Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) questionnaire to evaluate NP in 70 patients with BC...
February 15, 2018: Neurological Research
https://www.readbyqxmd.com/read/29447023/designing-a-low-cost-single-supply-ecg-system-for-suppression-of-movement-artifact-from-contaminated-magnetocardiogram
#13
Rajesh Patel, S Sengottuvel, K Gireesan, M P Janawadkar, T S Radhakrishnan
Measurement of the late potentials and His-bundle activity is crucial for many clinical studies using the noncontact and noninvasive magnetocardiography (MCG) technique; these weak signals are extracted by averaging many cardiac cycles aligned using the R-peak of the cardiac cycle identified using an electrocardiography (ECG) lead. ECG is measured simultaneously with MCG using a conventional dual-supply ECG amplifier, which requires either two separate batteries or a single battery with a switching voltage inverter circuit for its proper operation...
February 1, 2018: SLAS Technology
https://www.readbyqxmd.com/read/29446712/measures-of-sympathetic-and-parasympathetic-autonomic-outflow-from-heartbeat-dynamics
#14
Gaetano Valenza, Luca Citi, J Phillip Saul, Riccardo Barbieri
Reliable and effective non-invasive measures of sympathetic and parasympathetic peripheral outflow are of crucial importance in cardiovascular physiology. Although many techniques have been proposed to take up this long-lasting challenge, none has proposed a satisfying discrimination of the dynamics of the two separate branches. Spectral analysis of heart rate variability is the most currently used technique for such assessment. Despite its widespread use, it has been demonstrated that the subdivision in the low frequency (LF) and high frequency (HF) bands does not fully reflect separate influences of the sympathetic and parasympathetic branches, respectively, mainly due to their simultaneous action in the LF...
February 15, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29445936/pulmonary-arterial-hemodynamic-assessment-by-a-novel-index-in-systemic-sclerosis-patients-pulmonary-pulse-transit-time
#15
Mehmet Dogan, Tolga Han Efe, Tolga Cimen, Cem Ozisler, Mehmet Ali Felekoglu, Ahmet Goktug Ertem, Mehmet Erat, Omer Yiginer, Murat Tulmac
OBJECTIVES: Systemic sclerosis (SSc) is a chronic, inflammatory, and autoimmune connective tissue disease that is associated with vascular lesions, and fibrosis of the skin and visceral organs. Cardiac complications may occur as a secondary effect of SSc as a result of pulmonary arterial hypertension and interstitial lung disease. The objective of this study was to assess whether the pulmonary pulse transit time (pPTT) could serve as a diagnostic marker for pulmonary arterial alterations in patients with SSc, prior to development of pulmonary hypertension...
February 14, 2018: Lung
https://www.readbyqxmd.com/read/29445096/chronic-intermittent-hypoxia-promotes-myocardial-ischemia-related-ventricular-arrhythmias-and-sudden-cardiac-death
#16
Jessica Morand, Claire Arnaud, Jean-Louis Pepin, Diane Godin-Ribuot
We investigated the effects of intermittent hypoxia (IH), such as that encountered in severe obstructive sleep apnea (OSA) patients, on the development and severity of myocardial ischemia-related ventricular arrhythmias. Rats were exposed to 14 days of IH (30 s at 5%O 2 and 30 s at 21%O 2 , 8 h·day -1 ) or normoxia (N, similar air-air cycles) and submitted to a 30-min coronary ligature. Arterial blood pressure (BP) and ECG were recorded for power spectral analysis, ECG interval measurement and arrhythmia quantification...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444778/efficacy-and-safety-of-the-shexiang-baoxin-pill-for-the-treatment-of-coronary-artery-disease-not-amenable-to-revascularisation-study-protocol-for-a-randomised-placebo-controlled-double-blinded-trial
#17
Pan-Pan Tian, Jun Li, Jian Gao, Ying Li
INTRODUCTION: Coronary artery disease (CAD) not amenable to revascularisation indicates that the coronary arteries have severe diffuse lesions or calcifications, or that CAD is complicated with severe multiple-organ disease. Currently, Western medicines available for the treatment of CAD not amenable to revascularisation are limited. Shexiang Baoxin Pill (SBP), a type of Chinese patent medicine, has been widely used to treat CAD in China for many years. Previous studies have shown that long-term administration of SBP (1-2 pills three times daily, for at least 6 months) for treatment of CAD is effective and safe, with a significant, long-term effect...
February 14, 2018: BMJ Open
https://www.readbyqxmd.com/read/29443088/simultaneous-video-eeg-ecg-monitoring-to-identify-neurocardiac-dysfunction-in-mouse-models-of-epilepsy
#18
Vikas Mishra, Nicole M Gautier, Edward Glasscock
In epilepsy, seizures can evoke cardiac rhythm disturbances such as heart rate changes, conduction blocks, asystoles, and arrhythmias, which can potentially increase risk of sudden unexpected death in epilepsy (SUDEP). Electroencephalography (EEG) and electrocardiography (ECG) are widely used clinical diagnostic tools to monitor for abnormal brain and cardiac rhythms in patients. Here, a technique to simultaneously record video, EEG, and ECG in mice to measure behavior, brain, and cardiac activities, respectively, is described...
January 29, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29440187/repolarization-heterogeneity-measured-with-t-wave-area-dispersion-in-standard-12-lead-ecg-predicts-sudden-cardiac-death-in-general-population
#19
Tuomas V Kenttä, Moritz F Sinner, Bruce D Nearing, Rebecca Freudling, Kimmo Porthan, Jani T Tikkanen, Martina Müller-Nurasyid, Katharina Schramm, Matti Viitasalo, Antti Jula, Markku S Nieminen, Annette Peters, Veikko Salomaa, Lasse Oikarinen, Richard L Verrier, Stefan Kääb, M Juhani Junttila, Heikki V Huikuri
BACKGROUND: We developed a novel electrocardiographic marker, T-wave area dispersion (TW-Ad), which measures repolarization heterogeneity by assessing interlead T-wave areas during a single cardiac cycle and tested whether it can identify patients at risk for sudden cardiac death (SCD) in the general population. METHODS AND RESULTS: TW-Ad was measured from standard digital 12-lead ECG in 5618 adults (46% men; age, 50.9±12.5 years) participating in the Health 2000 Study-an epidemiological survey representative of the Finnish adult population...
February 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29440183/ambulatory-blood-pressure-and-long-term-risk-for-atrial-fibrillation
#20
Valérie Tikhonoff, Tatiana Kuznetsova, Lutgarde Thijs, Nicholas Cauwenberghs, Katarzyna Stolarz-Skrzypek, Jitka Seidlerová, Sofia Malyutina, Natasza Gilis-Malinowska, Ewa Swierblewska, Kalina Kawecka-Jaszcz, Jan Filipovský, Krzysztof Narkiewicz, Gregory Y H Lip, Edoardo Casiglia, Jan A Staessen
OBJECTIVE: Data on the contribution of ambulatory blood pressure (ABP) components to the risk of developing atrial fibrillation (AF) are limited. We prospectively tested the hypothesis that ABP may represent a potentially modifiable risk factor for the development of AF in a European population study. METHODS: We recorded daytime blood pressure (BP) in 3956 subjects randomly recruited from the general population in five European countries. Of these participants, 2776 (70...
February 9, 2018: Heart: Official Journal of the British Cardiac Society
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