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https://www.readbyqxmd.com/read/29885677/atrioventricular-conduction-disturbance-during-pulmonary-vein-isolation-using-the-second-generation-cryoballoon-vagal-impact-of-cryoballoon-ablation
#1
Shinsuke Miyazaki, Takatsugu Kajiyama, Tomonori Watanabe, Masahiro Hada, Kazuya Yamao, Hiroaki Nakamura, Hitoshi Hachiya, Hiroshi Tada, Kenzo Hirao, Yoshito Iesaka
BACKGROUND: Vagal reactions of the sinus node during pulmonary vein isolation (PVI) have been reported, however, data on intra-procedural atrioventricular conduction disturbances have been sparse. The present study aimed to investigate the clinical characteristics of atrioventricular conduction block (AVB) during PVI using second-generation cryoballoons. METHODS: A total of 2252 PVs among 568 consecutive atrial fibrillation patients undergoing PVI with 28-mm cryoballoons were analyzed...
August 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29881574/a-recurrent-concealed-parahisian-accessory-pathway
#2
Thierry Verbeet, Jose Castro, Alexandre Almorad
This case demonstrates the interest of ablating in the aortic root in case of resistant parahisian accessory pathways with failure of the right side approach. Failure on the right side may be due to fear of creating an AV block of failure to ablate critical fibers in the parahisian position.
June 2018: Clinical Case Reports
https://www.readbyqxmd.com/read/29800750/acute-biventricular-hemodynamic-effects-of-cardiac-resynchronization-therapy-in-right-bundle-branch-block
#3
Brian A Houston, J Lacy Sturdivant, Yinghong Yu, Michael R Gold
BACKGROUND: Controversy remains regarding the utility of cardiac resynchronization therapy (CRT) in heart failure patients with right bundle branch block (RBBB) and reduced left ventricular ejection fraction. Moreover, little is known regarding the acute hemodynamic changes with CRT in this subgroup compared with LBBB. OBJECTIVE: To understand the effects of cardiac resynchronization therapy (CRT) in RBBB patients, this study evaluated the acute biventricular hemodynamic response of CRT and other pacing configurations, including the effects of AV delay and atrial pacing METHODS: Forty patients (9 with RBBB and 31 with LBBB) undergoing CRT implantation underwent temporary pacing with varying configurations and AV delay...
May 22, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29784020/atrioventricular-block-after-acute-myocardial-infarction-and-its-association-with-other-clinical-parameters-in-pakistani-patients-an-institutional-perspective
#4
Kashif Ali Hashmi, Amir Shehzad, Atif Ali Hashmi, Amir Khan
OBJECTIVES: Conduction defects complicating acute myocardial infarction are frequently associated with increased morbidity and mortality. As frequency of this complication has not been widely studied in our population, therefore in this study we aimed to evaluate the frequency of complete atrioventricular block in patients with acute ST segment elevation myocardial infarction and its association with other clinical parameters. RESULTS: The mean age of the patients was 50...
May 21, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29759778/does-first-degree-av-block-have-importance-in-patients-considered-for-cardiac-resynchronization-therapy-giving-it-the-third-degree
#5
EDITORIAL
Brian Olshansky
No abstract text is available yet for this article.
August 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29758405/accelerometer-based-av-synchronous-pacing-with-a-ventricular-leadless-pacemaker-results-from-the-micra-av-feasibility-studies
#6
Larry Chinitz, Philippe Ritter, Surinder Kaur Khelae, Saverio Iacopino, Christophe Garweg, Maria Grazia-Bongiorni, Petr Neuzil, Jens Brock Johansen, Lluis Mont, Efrain Gonzalez, Venkata Sagi, Gabor Z Duray, Nicolas Clementy, Todd Sheldon, Vincent Splett, Kurt Stromberg, Nicole Wood, Clemens Steinwender
BACKGROUND: Micra is a leadless pacemaker that is implanted in the right ventricle and provides rate response via a 3-axis accelerometer (ACC). Custom software was developed to detect atrial contraction using the ACC enabling AV synchronous pacing. OBJECTIVE: To sense atrial contractions from the Micra ACC signal and provide AV synchronous pacing. METHODS: The MASS/MASS2 early feasibility studies showed intracardiac accelerations related to atrial contraction can be measured via ACC in the Micra leadless pacemaker...
May 8, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29749935/improvement-of-reverse-remodeling-using-electrocardiogram-fusion-optimized-intervals-in-cardiac-resynchronization-therapy-a-randomized-study
#7
Emilce Trucco, José María Tolosana, Elena Arbelo, Ada Doltra, María Ángeles Castel, Eva Benito, Roger Borràs, Eduard Guasch, Silvia Vidorreta, Barbara Vidal, Silvia Montserrat, Marta Sitges, Antonio Berruezo, Josep Brugada, Lluís Mont
OBJECTIVES: The aim of this study was to compare patient response to cardiac resynchronization therapy (CRT) using fusion-optimized atrioventricular (AV) and interventricular (VV) intervals versus nominal settings. BACKGROUND: The additional benefit obtained by AV- and VV-interval optimization in patients undergoing CRT remains controversial. Previous studies show short-term benefit in hemodynamic parameters; however, midterm randomized comparison between electrocardiogram optimization and nominal parameters is lacking...
February 2018: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29709231/anterior-myocardial-infarction-with-high-degree-av-block-in-a-62-year-old-man
#8
Hein J Wellens
No abstract text is available yet for this article.
May 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29701363/david-operation-in-the-bicuspid-aortic-valve-population
#9
Pedro Magro, Marta Marques, Miguel Abecacis
INTRODUCTION: Bicuspid aortic valve (BAV) is the single most common cardiac congenital mal-formation with a prevalence of 1-2%. It is frequently associated with aortic disease including annular ectasia. Increasing evidence suggests that valve-sparing root re-implantation surgery combined with primary aortic valve repair can be performed with good midterm results in patients with BAV. METHODS: Our objective is to compare the short and long term results of David procedure in BAV patients with aortic root ectasia...
July 2017: Revista Portuguesa de Cirurgia Cardio-torácica e Vascular
https://www.readbyqxmd.com/read/29678778/clinical-and-electrophysiological-characteristics-of-patients-with-paroxysmal-intra-his-block-with-narrow-qrs-complexes
#10
Loheetha Ragupathi, Drew Johnson, Arnold Greenspon, Daniel Frisch, Reginald T Ho, Behzad B Pavri
BACKGROUND: Atrioventricular (AV) block is usually due to infranodal disease and associated with a wide QRS complex; such patients often progress to complete AV block and pacemaker dependency. Uncommonly, infranodal AV block can occur within the His bundle with a narrow QRS complex. OBJECTIVES: The aims of this study were to define clinical/echocardiographic characteristics of patients with AV block within the His bundle and report progression to pacemaker dependency...
April 18, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29625102/tricuspid-valve-detachment-in-ventricular-septal-defect-closure-does-not-impact-valve-function
#11
Charles D Fraser, Xun Zhou, Sandeep Palepu, Cecillia Lui, Alejandro Suarez-Pierre, Todd C Crawford, J Trent Magruder, Marshall L Jacobs, Duke E Cameron, Narutoshi Hibino, Luca A Vricella
BACKGROUND: Although tricuspid valve detachment (TVD) facilitates improved exposure during transatrial ventricular septal defect (VSD) closure, few have analyzed the impact of TVD on long-term valve durability. METHODS: Pediatric patients undergoing VSD closure at our institution from 1997 to 2013 were identified, and charts were retrospectively reviewed. Patients were separated into groups based on utilization of TVD. Propensity score matching was then performed using a nonparsimonious logistic regression model involving 7 variables...
April 3, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29614795/full-atrioventricular-block-secondary-to-acute-poisoning-mercury-a-case-report
#12
Amelia Geraldine Peregrina-Chávez, María Del Rayo Ramírez-Galindo, Rolando Chávez-Martínez, Cesar Anuar Delahanty-Delgado, Fernando Vazquez-Alaniz
Background: The biological behaviour and clinical significance of mercury toxicity vary according to its chemical structure. Mercury differs in its degree of toxicity and in its effects on the nervous, digestive and immune systems as well as on organs such as the lungs, kidneys, skin, eyes and heart. Human exposure occurs mainly through inhalation of elemental mercury vapours during industrial and artisanal processes such as artisanal and small-scale gold mining. Case presentation: A 52-years-old female, housewife, with a body mass index of 25...
April 2, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29572123/clinical-and-electrocardiographic-presentations-of-transient-trifascicular-block-in-three-cats
#13
Eva M Oxford, Flavia B Giacomazzi, N Sydney Moïse, Roberto A Santilli
This report describes transient trifascicular block in three cats presented with lethargy and inappetence, and elevated cardiac troponin I concentrations. The electrocardiogram (ECG) of cat 1 showed a sinus rhythm with pronounced first-degree atrioventricular (AV) block, right bundle branch block, and left anterior fascicular block. The ECG of cat 2 showed truncular left bundle branch block alternating with left anterior fascicular block coupled with prolonged PR intervals, second-degree heart block, and paroxysmal third-degree AV block...
March 20, 2018: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/29556909/outcome-of-slow-pathway-modulation-for-atrioventricular-nodal-reentrant-tachycardia-with-50-versus-30-watts-more-power-more-effect
#14
Dirk G Dechering, Ruben Schleberger, Eva Greiser, Jannis Dickow, Julia Koebe, Gerrit Frommeyer, Stephan Willems, Lars Eckardt, Boris A Hoffmann, Kristina Wasmer
PURPOSE: Slow pathway modulation is the treatment of choice in patients with atrioventricular nodal reentrant tachycardia (AVNRT). No comparative data on ablation strategies exist. Therefore, we sought to compare two common ablation approaches. METHODS: We analyzed prospective ablation databases of two high-volume tertiary centers (> 1000 ablations/year) using either 30 or 50 W for slow pathway modulation from 2012 to 2013. We analyzed procedural characteristics as well as short- and long-term outcomes...
March 19, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29550833/a-case-of-lown-ganong-levine-syndrome-due-to-an-accessory-pathway-of-james-fibers-or-enhanced-atrioventricular-nodal-conduction-eavnc
#15
Juanita Hunter, Emmanouil Tsounias, John Cogan, Ming-Lon Young
BACKGROUND Lown-Ganong-Levine syndrome, includes a short PR interval, normal QRS complex, and paroxysmal tachycardia. The pathophysiology of this syndrome includes an accessory pathway connecting the atria and the atrioventricular (AV) node (James fiber), or between the atria and the His bundle (Brechenmacher fiber). Similar features are seen in enhanced atrioventricular nodal conduction (EAVNC), with the underlying pathophysiology due to a fast pathway to the AV node, and with the diagnosis requiring specific electrophysiologic criteria...
March 18, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29540351/beer-hyponatraemia-and-cardiac-conduction-defects
#16
Simon Mifsud, Emma Louise Schembri, Matthew Mercieca Balbi, Mark Gruppetta, James Clark
The authors report a case of a 68-year-old man who was diagnosed with an irreversible second-degree atrioventricular (AV) Mobitz II 2:1 block temporally associated with profound hyponatraemia. The cause of the hyponatraemia was beer potomania. The co-occurrence of reversible first, second and third-degree heart blocks and hyponatraemia has been described in a few published case reports. However, this case is noteworthy as the AV block persisted, despite correction of serum sodium concentration as opposed to other published cases, which meant that the patient required a permanent pacemaker...
March 14, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29534001/the-popeye-domain-containing-genes-and-their-function-as-camp-effector-proteins-in-striated-muscle
#17
REVIEW
Thomas Brand
The Popeye domain containing (POPDC) genes encode transmembrane proteins, which are abundantly expressed in striated muscle cells. Hallmarks of the POPDC proteins are the presence of three transmembrane domains and the Popeye domain, which makes up a large part of the cytoplasmic portion of the protein and functions as a cAMP-binding domain. Interestingly, despite the prediction of structural similarity between the Popeye domain and other cAMP binding domains, at the protein sequence level they strongly differ from each other suggesting an independent evolutionary origin of POPDC proteins...
March 13, 2018: Journal of Cardiovascular Development and Disease
https://www.readbyqxmd.com/read/29529974/the-electrocardiographic-manifestations-of-athlete-s-heart-and-their-association-with-exercise-exposure
#18
Bram Bessem, Matthijs C de Bruijn, Wybe Nieuwland, Johannes Zwerver, Maarten van den Berg
OBJECTIVE: The aim of this study was to define the minimum amount of exercise per week ('current exposure') and the total amount of exercise ('lifetime exposure') needed to lead to the electrocardiographic changes fitting athlete's heart. METHODS: All the pre-participation screenings (including electrocardiograms (ECGs)) from collegiate athletes performed at University Sports Medical Center in 2013 and 2014 were collected. Data on height, weight, sex, age, current sport(s) participation and lifetime sport(s) participation were collected...
March 12, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29518324/deficient-lipid-a-remodeling-by-the-arnb-gene-promotes-biofilm-formation-in-antimicrobial-peptide-susceptible-pseudomonas-aeruginosa
#19
Li-Av Segev-Zarko, Gal Kapach, Michaele Josten, Yoel Alexander Klug, Hans-Georg Sahl, Yechiel Shai
Multidrug resistant bacteria possess various mechanisms that can sense environmental stresses such as antibiotics and antimicrobial peptides and rapidly respond to defend themselves. Two known defense strategies are biofilm formation and lipopolysaccharide (LPS) modification. Though LPS modifications are observed in biofilm-embedded bacteria, their effect on biofilm formation is unknown. Using biochemical and biophysical methods coupled with confocal microscopy, atomic force microscopy, and transmission electron microscopy, we show that biofilm formation is promoted in a Pseudomonas aeruginosa PAO1 strain with a loss of function mutation in the arnB gene...
April 3, 2018: Biochemistry
https://www.readbyqxmd.com/read/29514866/intramyocardial-block-in-patients-with-atrioventricular-block
#20
Guoliang Li, Ardan M Saguner, Deniz Akdis, Guy H Fontaine
Atrioventricular (AV) block has been extensively studied. However, conduction inside the myocardium in patients with AV block has not been reported. In this study, we aimed to demonstrate the presence of intramyocardial block in patients with AV block. Five consecutive patients with spontaneous high-grade AV block and Torsades de pointes (TdP) were prospectively studied with standard United States Catheter Instruments (USCI) endocardial temporary catheter located at the right ventricle (RV) apex. The morphology of endocardial potentials observed in the basic QRS complexes as well as during episodes of TdP was studied...
March 7, 2018: Journal of Investigative Medicine: the Official Publication of the American Federation for Clinical Research
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