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https://www.readbyqxmd.com/read/28077104/effects-of-treadmill-exercise-versus-flutter%C3%A2-on-respiratory-flow-and-sputum-properties-in-adults-with-cystic-fibrosis-a-randomised-controlled-cross-over-trial
#1
Tiffany J Dwyer, Rahizan Zainuldin, Evangelia Daviskas, Peter T P Bye, Jennifer A Alison
BACKGROUND: Treadmill exercise and airway clearance with the Flutter® device have previously been shown to improve mucus clearance mechanisms in people with cystic fibrosis (CF) but have not been compared. It is therefore not known if treadmill exercise is an adequate form of airway clearance that could replace established airway clearance techniques, such as the Flutter®. The aim of this study was to evaluate respiratory flow, sputum properties and subjective responses of treadmill exercise and Flutter® therapy, compared to resting breathing (control)...
January 11, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28075344/pull-in-effect-of-suspended-microchannel-resonator-sensor-subjected-to-electrostatic-actuation
#2
Han Yan, Wen-Ming Zhang, Hui-Ming Jiang, Kai-Ming Hu
In this article, the pull-in instability and dynamic characteristics of electrostatically actuated suspended microchannel resonators are studied. A theoretical model is presented to describe the pull-in effect of suspended microchannel resonators by considering the electrostatic field and the internal fluid. The results indicate that the system is subjected to both the pull-in instability and the flutter. The former is induced by the applied voltage which exceeds the pull-in value while the latter occurs as the velocity of steady flow get closer to the critical velocity...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28073682/study-design-for-control-of-heart-rate-in-infant-and-child-tachyarrhythmia-with-heart-failure-using-landiolol-heartful-a-prospective-multicenter-uncontrolled-clinical-trial
#3
Naokata Sumitomo, Hitoshi Horigome, Masaru Miura, Hiroshi Ono, Hideaki Ueda, Kiyohiro Takigiku, Jun Yoshimoto, Naoki Ohashi, Tsugutoshi Suzuki, Koichi Sagawa, Hiroya Ushinohama, Kazuhiro Takahashi, Aya Miyazaki, Heima Sakaguchi, Mari Iwamoto, Motoki Takamuro, Chiho Tokunaga, Tetsuji Nagano
BACKGROUND: Persistent tachycardia in pediatric patients after congenital heart surgery further deteriorates their hemodynamic condition, and may become fatal. Therefore, immediate control of the tachycardia is mandatory in these patients. For this purpose, quick-acting, short-acting, titratable intravenous agents are required. However, there are no agents with such characteristics among the drugs approved for control of pediatric arrhythmias in Japan, and thus novel and effective medications for these patients are awaited...
January 7, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28070875/atrial-fibrillation-inducibility-during-cavotricuspid-isthmus-dependent-atrial-flutter-ablation-as-a-predictor-of-clinical-atrial-fibrillation-a-meta-analysis
#4
Jorge Romero, Juan Carlos Diaz, Luigi Di Biase, Saurabh Kumar, David Briceno, Usha B Tedrow, Carolina R Valencia, Samuel H Baldinger, Bruce Koplan, Laurence M Epstein, Roy John, Gregory F Michaud, William G Stevenson
BACKGROUND: Atrial fibrillation (AF) and cavotricuspid isthmus (CTI)-dependent atrial flutter (AFL) are two separate entities that coexist in a significant percentage of patients. We sought to investigate whether AF inducibility during CTI AFL ablation predicted the occurrence of AF at follow-up after successful AFL ablation. METHODS: A systemic review of Medline, Cochrane, and Embase was done for all the clinical studies in which assessment of AF inducibility in patients undergoing ablation for CTI AFL was performed...
January 9, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28069839/incidence-of-new-onset-atrial-fibrillation-after-cavotricuspid-isthmus-ablation-for-atrial-flutter
#5
Umut Celikyurt, Sven Knecht, Michael Kuehne, Tobias Reichlin, Aline Muehl, Florian Spies, Stefan Osswald, Christian Sticherling
AIMS: In patients with cavotricuspid isthmus (CTI) ablation for atrial flutter (AFL), the decision to hold oral anticoagulation (OAC) often becomes an issue. The purpose of this study was to describe the incidence of the development of atrial fibrillation (AF) after CTI ablation in patients with documented AFL with and without a previous history of AF and to identify risk predictors for the occurrence of AF after CTI. METHODS AND RESULTS: We included 364 consecutive patients undergoing successful CTI ablation...
January 8, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28068917/emergency-department-presentations-for-atrial-fibrillation-and-flutter-in-alberta-a-large-population-based-study
#6
Rhonda J Rosychuk, Michelle M Graham, Brian R Holroyd, Brian H Rowe
BACKGROUND: Atrial fibrillation or flutter (AFF) are not infrequent presenting problems in Emergency Departments (ED); however, little is known of the pattern of these presentations. This study provides a description of AFF presentations and outcomes after ED discharge in Alberta. METHODS: Provincial administrative databases were used to obtain all primary ED encounters for AFF during 1999 to 2011 for patients aged >35 years. Data extracted included demographics, ED visit timing, and subsequent visits to non-ED settings...
January 10, 2017: BMC Emergency Medicine
https://www.readbyqxmd.com/read/28057775/catheter-ablation-for-atrial-flutter-a-survey-by-the-european-heart-rhythm-association-and-canadian-heart-rhythm-society
#7
Benedict M Glover, Jian Chen, Kathryn L Hong, Serge Boveda, Adrian Baranchuk, Kristina H Haugaa, Paul Dorian, Tatjana S Potpara, Eugene Crystal, Brent Mitchell, Roland Tilz, Peter Leong-Sit, Nikolaos Dagres
The purpose of this EP wire survey was to examine current practice in the management of both cavotricuspid isthmus : CTI)-dependent and non-CTI-dependent atrial flutter (AFL) ablation amongst electrophysiologists in European and Canadian centres and to understand how current opinions vary from guidelines. The results of the survey were collected from a detailed questionnaire that was created by the European Heart Rhythm Association Research Network and the Canadian Heart Rhythm Society. Responses were received from 89 centres in 12 countries...
January 5, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28043429/results-of-cryoablation-for-atrial-fibrillation-concomitant-with-video-assisted-minimally-invasive-mitral-valve-surgery
#8
Giovanni Marchetto, Matteo Anselmino, Chiara Rovera, Samuel Mancuso, Davide Ricci, Marina Antolini, Mara Morello, Fiorenzo Gaita, Mauro Rinaldi
Interest in minimally invasive video-assisted mitral valve surgery (MIMVS) is rapidly growing. Data on concomitant atrial fibrillation (AF) ablation to MIMVS are still lacking. The present study investigates the long-term results of AF cryoablation concomitant to MIMVS. From October 2006-September 2014, 68 patients with mitral valve disease (age 65.9 ± 11.1 years, 34 men out of 68 patients, Euroscore log 5.4 ± 4.5) and drug-resistant AF underwent MIMVS via right minithoracotomy and concomitant left-sided AF endocardial cryoablation (Cryoflex Medtronic, Minneapolis, MN)...
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28039281/association-of-rate-dependent-conduction-block-between-eccentric-coronary-sinus-to-left-atrial-connections-with-inducible-atrial-fibrillation-and-flutter
#9
Dong Huang, Joseph E Marine, Jing-Bo Li, Tarek Zghaib, Esra Gucuk Ipek, Sunil Sinha, David D Spragg, Hiroshi Ashikaga, Ronald D Berger, Hugh Calkins, Saman Nazarian
BACKGROUND: We sought to describe the prevalence and variability of coronary sinus (CS) and left atrial (LA) myocardium connections, their susceptibility to rate-dependent conduction block, and association with atrial fibrillation (AF) and flutter induction. METHODS AND RESULTS: The study cohort included 30 consecutive AF patients (age 63.3±10.5 years, 63% male). Multipolar catheters were positioned in the CS, high right atrium (HRA), and LA parallel to and near the CS...
January 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28028497/providing-an-efficient-algorithm-for-finding-r-peaks-in-ecg-signals-and-detecting-ventricular-abnormalities-with-morphological-features
#10
Mohammad Pooyan, Fateme Akhoondi
Ventricular arrhythmias are one of the most important causes of annual deaths in the world, which may lead to sudden cardiac deaths. Accurate and early diagnosis of ventricular arrhythmias in heart diseases is essential for preventing mortality in cardiac patients. Ventricular activity on the electrocardiogram (ECG) signal is in the interval from the beginning of QRS complex to T wave end. Variations in the ECG signal and its features may indicate heart condition of patients. The first step to extract features of ECG in time domain is finding R peaks...
October 2016: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28025488/toxicity-and-physiological-actions-of-carbonic-anhydrase-inhibitors-to-aedes-aegypti-and-drosophila-melanogaster
#11
Sheena A M Francis, Jennina Taylor-Wells, Aaron D Gross, Jeffrey R Bloomquist
The physiological role of carbonic anhydrases in pH and ion regulation is crucial to insect survival. We examined the toxic and neurophysiological effects of five carbonic anhydrase inhibitors (CAIs) against Aedes aegypti. The 24 h larvicidal toxicities followed this rank order of potency: dichlorphenamide > methazolamide > acetazolamide = brinzolamide = dorzolamide. Larvicidal activity increased modestly in longer exposures, and affected larvae showed attenuated responses to probing without overt tremors, hyperexcitation, or convulsions...
December 22, 2016: Insects
https://www.readbyqxmd.com/read/28000150/atrial-fibrillation-following-aortic-valve-replacement-impact-of-perioperative-use-of-intravenous-%C3%AE-blocker
#12
Junki Yokota, Hiroyuki Nishi, Naosumi Sekiya, Mitsutomo Yamada, Toshiki Takahashi
OBJECTIVES: Despite recent advances in perioperative management, postoperative atrial fibrillation/flutter (POAF) remains the most common complication after cardiac surgery. Therefore, it is important to determine related risk factors to establish effective management. However, most studies have focused on patients undergoing coronary artery bypass grafting and little is known about POAF in those who receive aortic valve replacement (AVR). We investigated the relationship of clinical predictors with POAF in patients undergoing AVR...
December 20, 2016: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/27995288/nadolol-for-treatment-of-supraventricular-tachycardia-in-infants-and-young-children
#13
Johannes C von Alvensleben, Martin J LaPage, Regine Caruthers, David J Bradley
Supraventricular tachycardia (SVT) is a common infant arrhythmia, for which beta-blockers are frequently chosen as therapy. Propranolol is a common choice though it is dosed every 6-8 h. We reviewed the clinical results of treating infant SVT with an extemporaneous preparation of nadolol. Retrospective cohort study of patients under 2 years old receiving nadolol for SVT at a single center. Patients were ascertained by patient and pharmacy databases. Twenty-eight infants received nadolol, of whom 25 had regular narrow complex tachycardia, 2 atrial flutter, and 1 focal atrial tachycardia...
December 19, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27987225/arrhythmias-in-adults-with-congenital-heart-disease-what-are-risk-factors-for-specific-arrhythmias
#14
Rohit S Loomba, Matthew W Buelow, Saurabh Aggarwal, Rohit R Arora, Joshua Kovach, Salil Ginde
INTRODUCTION: An increasing number of patients with congenital heart disease are now surviving into adulthood. This has also led to the emergence of complications from the underlying congenital heart disease, related surgical interventions, and associated combordities. While the prevalence of particular arrhythmias with specific congenital heart disease has been previously described, a detailed analysis of all lesions and a large number of comorbidities has not been previously published...
December 16, 2016: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/27939495/development-and-impact-of-arrhythmias-after-the-norwood-procedure-a-report-from-the-pediatric-heart-network
#15
Matthew E Oster, Shan Chen, Nicholas Dagincourt, Yaniv Bar-Cohen, Matthew Brothers, Nicole Cain, Steven D Colan, Richard J Czosek, Jamie A Decker, David G Gamboa, Salim F Idriss, Joel A Kirsh, Martin J LaPage, Richard G Ohye, Elizabeth Radojewski, Maully Shah, Eric S Silver, Anoop K Singh, Joel D Temple, John Triedman, Jonathan R Kaltman
OBJECTIVES: The study objective was to determine the predictors of new-onset arrhythmia among infants with single-ventricle anomalies during the post-Norwood hospitalization and the association of those arrhythmias with postoperative outcomes (ventilator time and length of stay) and interstage mortality. METHODS: After excluding patients with preoperative arrhythmias, we used data from the Pediatric Heart Network Single Ventricle Reconstruction Trial to identify risk factors for tachyarrhythmias (atrial fibrillation, atrial flutter, supraventricular tachycardia, junctional ectopic tachycardia, and ventricular tachycardia) and atrioventricular block (second or third degree) among 544 eligible patients...
November 16, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/27925233/quantification-and-analysis-of-leaflet-flutter-on-biological-prosthetic-cardiac-valves
#16
Artur H de F Avelar, Jean A Canestri, Camila Bim, Maíra G M Silva, Rudolf Huebner, Marcos Pinotti
The use of porcine or bovine pericardium biological cardiac valves has as its main disadvantage a relatively short lifespan, with failures due to calcification and fatigue. Increasing these valves' durability constitutes a great challenge. An understudied phenomenon is the effect of flutter, an oscillation of the leaflets that can cause regurgitation and accelerate calcification and fatigue. As a starting point to study how to reduce or prevent these oscillations, a method was developed to quantify the flutter frequencies occurring at the point of the valve's full opening...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27923735/a-shadow-detector-for-photosynthesis-efficiency
#17
Kang-Ling Liao, Roger D Jones, Patrick McCarter, Meral Tunc-Ozdemir, James A Draper, Timothy C Elston, David Kramer, Alan M Jones
Plants tolerate large variations in the intensity of the light environment by controlling the efficiency of solar to chemical energy conversion. To do this, plants have a mechanism to detect the intensity, duration, and change in light as they experience moving shadows, flickering light, and cloud cover. Sugars are the primary products of CO2 fixation, a metabolic pathway that is rate limited by this solar energy conversion. We propose that sugar is a signal encoding information about the intensity, duration and change in the light environment...
December 3, 2016: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/27920828/detection-of-sequential-activation-of-left-atrium-and-coronary-sinus-musculature-in-the-general-population
#18
Masaki Ota, Yoshiaki Kaneko, Tadashi Nakajima, Tadanobu Irie, Takafumi Iijima, Akihiro Saito, Masahiko Kurabayashi
BACKGROUND: The direction of impulse propagation across the coronary sinus (CS) musculature (CSM) is an important piece of the mechanistic puzzle underlying atrial tachyarrhythmias. We hypothesized that in the general population, the sequence of left atrial (LA) to CSM electrograms recorded in the CS reflects the direction of impulse propagation over the CSM. METHODS: We studied 19 patients with atrioventricular (AV) reentrant tachycardia (RT) utilizing a left-sided accessory pathway (AP) and 21 patients with typical counterclockwise atrial flutter (AFL)...
December 2016: Journal of Arrhythmia
https://www.readbyqxmd.com/read/27919764/postoperative-atrial-tachycardias-after-mitral-valve-surgery-mechanisms-and-outcomes-of-catheter-ablation
#19
Andres Enriquez, Pasquale Santangeli, Erica Zado, Jackson Liang, Simon Castro, Fermin Garcia, Robert Schaller, Gregory Supple, David Frankel, David Callans, David Lin, Sanjay Dixit, Rajat Deo, Michael Riley, Francis Marchlinski
BACKGROUND: Atrial tachycardias (ATs) including atrial fibrillation are common arrhythmias occurring late after mitral valve (MV) surgery, and their management is challenging. OBJECTIVE: The purpose of this study was to determine the electrophysiological mechanisms of ATs in patients with prior MV surgery and the long-term outcomes of catheter ablation. METHODS: We studied 67 consecutive patients (mean age 59.4 ± 10.6 years; 41 men) with prior MV surgery who presented with ATs postoperatively between 2007 and 2015...
December 3, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27910083/radiofrequency-catheter-ablation-of-accessory-pathways-in-patients-with-ebstein-s-anomaly-at-8-years-of-follow-up
#20
Michał Orczykowski, Paweł Derejko, Robert Bodalski, Piotr Urbanek, Joanna Zakrzewska-Koperska, Radosław Sierpiński, Katarzyna Kalin, Andrzej Hasiec, Grzegorz Warmiński, Maria Miszczak-Knecht, Katarzyna Bieganowska, Rafał Baranowski, Maria Bilińska, Elżbieta Biernacka, Piotr Hoffman, Łukasz Szumowski
BACKGROUND: Data regarding long-term follow-up of radiofrequency catheter ablation (RFCA) of accessory pathways (APs) in patients with Ebstein's anomaly (EA) are limited. The procedures are challenging due to multiple or wide APs. METHODS: Analysis was performed on clinical and periprocedural data of patients with EA referred to the centre in order to perform catheter ablation of accessory pathway (AP). The group consisted of 22 patients (female 40.9%, mean age 33...
December 2, 2016: Cardiology Journal
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