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https://www.readbyqxmd.com/read/28801600/cav1-3-l-type-ca-2-channel-contributes-to-the-heartbeat-by-generating-a-dihydropyridine-sensitive-persistent-na-current
#1
Futoshi Toyoda, Pietro Mesirca, Stefan Dubel, Wei-Guang Ding, Joerg Striessnig, Matteo E Mangoni, Hiroshi Matsuura
The spontaneous activity of sinoatrial node (SAN) pacemaker cells is generated by a functional interplay between the activity of ionic currents of the plasma membrane and intracellular Ca(2+) dynamics. The molecular correlate of a dihydropyridine (DHP)-sensitive sustained inward Na(+) current (I st), a key player in SAN automaticity, is still unknown. Here we show that I st and the L-type Ca(2+) current (I Ca,L) share CaV1.3 as a common molecular determinant. Patch-clamp recordings of mouse SAN cells showed that I st is activated in the diastolic depolarization range, and displays Na(+) permeability and minimal inactivation and sensitivity to I Ca,L activators and blockers...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801530/rhythmic-behavior-is-controlled-by-the-srm160-splicing-factor-in-drosophila-melanogaster
#2
Esteban J Beckwith, Carlos E Hernando, Sofía Polcowñuk, Agustina P Bertolin, Estefania Mancini, M Fernanda Ceriani, Marcelo J Yanovsky
Circadian clocks organize the metabolism, physiology, and behavior of organisms throughout the day-night cycle by controlling daily rhythms in gene expression at the transcriptional and post-transcriptional levels. While many transcription factors underlying circadian oscillations are known, the splicing factors that modulate these rhythms remain largely unexplored. A genome-wide assessment of the alterations of gene expression in a null mutant of the alternative splicing regulator SR-related matrix protein of 160 kD (SRm160) revealed the extent to which alternative splicing impacts on behavior-related genes...
August 11, 2017: Genetics
https://www.readbyqxmd.com/read/28801329/postcardiac-injury-syndrome-and-stroke-following-permanent-pacemaker-insertion
#3
Caitlin Bialy, Edmund Wee, Nizam Uddin
An 80-year-old woman initially presented with an episode of pleuritic chest pain 10 days after implantation of a dual chamber permanent pacemaker. She returned to hospital a day later with vomiting and fever. She was found to have new atrial fibrillation in addition to right-sided weakness and dysarthria. An infarct in the left anterior inferior cerebellar artery territory was later confirmed on CT. She continued to have recurrent febrile episodes associated with vomiting and dyspnoea. Extensive investigations for infection were negative, and her symptoms were initially attributed to aspiration pneumonia...
August 11, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28800893/should-the-risk-of-a-permanent-pacemaker-be-considered-when-choosing-a-procedure-for-aortic-stenosis
#4
EDITORIAL
Scott Goldman
No abstract text is available yet for this article.
July 19, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28800884/ionic-mechanisms-of-the-action-of-anaesthetics-on-sinoatrial-node-automaticity
#5
REVIEW
Akiko Kojima, Hiroshi Matsuura
Although various general anaesthetics affect the heart rate in clinical settings, their precise mechanisms remain to be fully elucidated. Because the heart rate is determined by automaticity of the cardiac pacemaker sinoatrial node and its regulation by autonomic nervous system, it is important to clarify the effect of anaesthetics on sinoatrial node automaticity. The spontaneous electrical activity of sinoatrial node is generated by a complex but coordinated interaction of multiple ionic currents, such as the hyperpolarisation-activated cation current (If), T-type and L-type Ca(2+) currents (ICa,T and ICa,L), Na(+)/Ca(2+) exchange current (INCX), and rapidly and slowly activating delayed rectifier K(+) currents (IKr and IKs)...
August 8, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28798796/carotid-sinus-hypersensitivity-syncope-is-there-a-possible-alternative-approach-to-pacemaker-implantation-in-young-patients
#6
Zefferino Palamà, Ermenegildo De Ruvo, Domenico Grieco, Alessio Borrelli, Luigi Sciarra, Leonardo Calò
No abstract text is available yet for this article.
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28798790/single-and-dual-chamber-pacemaker-implantation-in-patients-with-left-superior-vena-cava-persistence-own-experiences
#7
Anna Żabówka, Jakub Kotarba, Zbigniew Siudak, Dariusz Dudek
No abstract text is available yet for this article.
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28797431/implantation-and-30-day-follow-up-on-all%C3%A2-4-valve-sizes-within-the-portico-transcatheter-aortic-bioprosthetic-family
#8
Helge Möllmann, Axel Linke, David M Holzhey, Thomas Walther, Ganesh Manoharan, Ulrich Schäfer, Karl Heinz-Kuck, Ad J Van Boven, Simon R Redwood, Jan Kovac, Christian Butter, Lars Søndergaard, Alexander Lauten, Gerhard Schymik, Stephen G Worthley
OBJECTIVES: The aim of this study was to evaluate the short-term safety and performance of the full range of valve sizes offered within the Portico transcatheter aortic valve replacement system. BACKGROUND: The Portico transcatheter aortic heart valve is a fully resheathable, repositionable, and self-expanding bioprosthesis designed to achieve optimal valve position and hemodynamic performance and limit conduction disturbances. METHODS: Patients (n = 222) with symptomatic (New York Heart Association functional class ≥II) severe aortic stenosis considered by a multidisciplinary heart team to be at high surgical risk were recruited between December 2011 and September 2015 in this prospective, nonrandomized, multicenter study...
August 14, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28797353/clinical-outcomes-with-a-repositionable-self-expanding-transcatheter-aortic%C3%A2-valve%C3%A2-prosthesis-the-international-forward-study
#9
Eberhard Grube, Nicolas M Van Mieghem, Sabine Bleiziffer, Thomas Modine, Johan Bosmans, Ganesh Manoharan, Axel Linke, Werner Scholtz, Didier Tchétché, Ariel Finkelstein, Ramiro Trillo, Claudia Fiorina, Antony Walton, Christopher J Malkin, Jae K Oh, Hongyan Qiao, Stephan Windecker
BACKGROUND: Clinical outcomes in large patient populations from real-world clinical practice with a next-generation self-expanding transcatheter aortic valve are lacking. OBJECTIVES: This study sought to document the clinical and device performance outcomes of transcatheter aortic valve replacement (TAVR) with a next-generation, self-expanding transcatheter heart valve (THV) system in patients with severe symptomatic aortic stenosis (AS) in routine clinical practice...
August 15, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28795259/comparison-of-outcomes-using-balloon-expandable-versus-self-expanding-transcatheter-prostheses-according-to-the-extent-of-aortic-valve-calcification
#10
Won-Keun Kim, Johannes Blumenstein, Christoph Liebetrau, Andreas Rolf, Luise Gaede, Arnaud Van Linden, Mani Arsalan, Mirko Doss, Jan G P Tijssen, Christian W Hamm, Thomas Walther, Helge Möllmann
BACKGROUND: Device landing zone (DLZ) calcification is an important determinant of procedural success in transcatheter aortic valve implantation (TAVI). OBJECTIVE: To evaluate the impact of DLZ calcification on procedural outcome with different types of transcatheter heart valves (THVs). METHODS: Aortic valve calcium density (AVCdens) was determined by non-contrast-enhanced computed tomography in 1232 patients undergoing transfemoral TAVI...
August 9, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28795030/comparison-of-the-outcomes-between-surgical-aortic-valve-replacement-and-transcatheter-aortic-valve-replacement-in-patients-aged-above-80
#11
Jeong-Woo Lee, Jihoon Kim, Sung-Ho Jung, Cheol Hyun Chung, Jae Won Lee
BACKGROUND: Transcatheter aortic valve replacement (TAVR) has been suggested as a less invasive treatment for high-risk patients with aortic valve disease. In this study, we compared the outcomes of conventional surgical aortic valve replacement (AVR) and TAVR in elderly patients aged over 80. METHODS: A total of 108 patients aged 80 years or older who underwent isolated AVR (n=35) or TAVR (n=73) from 2010 through 2015 at Asan Medical Center were identified. Early and late clinical outcomes, including echocardiographic findings, were evaluated in both groups...
August 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28792496/stabilization-of-diastolic-calcium-signal-via-calcium-pump-regulation-of-complex-local-calcium-releases-and-transient-decay-in-a-computational-model-of-cardiac-pacemaker-cell-with-individual-release-channels
#12
Alexander V Maltsev, Victor A Maltsev, Michael D Stern
Intracellular Local Ca releases (LCRs) from sarcoplasmic reticulum (SR) regulate cardiac pacemaker cell function by activation of electrogenic Na/Ca exchanger (NCX) during diastole. Prior studies demonstrated the existence of powerful compensatory mechanisms of LCR regulation via a complex local cross-talk of Ca pump, release and NCX. One major obstacle to study these mechanisms is that LCR exhibit complex Ca release propagation patterns (including merges and separations) that have not been characterized. Here we developed new terminology, classification, and computer algorithms for automatic detection of numerically simulated LCRs and examined LCR regulation by SR Ca pumping rate (Pup) that provides a major contribution to fight-or-flight response...
August 8, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28791727/morphology-and-classification-of-right-ventricular-bands-in-the-domestic-dog-canis-familiaris
#13
L A Cope
Ventricular bands, also designated as 'false tendons', are described as single or multiple strands that cross the ventricles and have no connection to valvular cusps. Previous work indicates these strands are present in the ventricles of humans and some animal hearts and not always associated with cardiac pathologies. Despite these previous studies, the published literature is limited in documenting the morphology of these strands and incidence in animals. In this study, examination of 89 hearts showed six types of ventricular bands in the right ventricle of the domestic dog...
August 9, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/28782492/impact-of-pre-existing-kidney-dysfuntion-on-outcomes-following-transcatheter-aortic-valve-replacement
#14
Ikechukwu A Ifedili, Oluwaseyi Bolorunduro, Tamunoinemi Bob-Manuel, Mark R Heckle, Ellis Christian, Saibal Kar, Uzoma N Ibebuogu
BACKGROUND: Pre-existing chronic kidney disease (CKD) portends adverse outcomes following heart valve surgery. However, only limited and conflicting evidence is available on the impact of CKD on outcomes following transcatheter aortic valve replacement (TAVR). The objective of this review was to evaluate the effect of pre-existing CKD on TAVR outcomes. METHODS: We performed a systematic electronic search using the PRISMA statement to identify all randomized controlled trials and observational studies investigating the effect of pre-existing CKD on outcomes following TAVR...
August 4, 2017: Current Cardiology Reviews
https://www.readbyqxmd.com/read/28781840/-spaghetti-twisting-technique-a-novel-method-of-catching-pacemaker-leads-using-a-needle-s-eye-snare
#15
Tsuyoshi Isawa, Takashi Yamada, Taku Honda, Kazuhiro Yamaya, Tatsushi Ootomo
The needle's eye snare has become an indispensable tool in contemporary pacemaker lead extraction techniques. Here, we present a modified method of using the needle's eye snare, named "spaghetti twisting" technique, to catch and secure pacemaker leads, which would help operators catch and secure leads much easily.
August 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28780194/scar-characterization-to-predict-life-threatening-arrhythmic-events-and%C3%A2-sudden-cardiac-death-in-patients-with-cardiac-resynchronization-therapy-the-gaudi-crt-study
#16
Juan Acosta, Juan Fernández-Armenta, Roger Borràs, Ignasi Anguera, Felipe Bisbal, Julio Martí-Almor, Jose M Tolosana, Diego Penela, David Andreu, David Soto-Iglesias, Reinder Evertz, María Matiello, Concepción Alonso, Roger Villuendas, Teresa M de Caralt, Rosario J Perea, Jose T Ortiz, Xavier Bosch, Luis Serra, Xavier Planes, Andreas Greiser, Okan Ekinci, Luis Lasalvia, Lluis Mont, Antonio Berruezo
OBJECTIVES: The aim of this study was to analyze whether scar characterization could improve the risk stratification for life-threatening ventricular arrhythmias and sudden cardiac death (SCD). BACKGROUND: Among patients with a cardiac resynchronization therapy (CRT) indication, appropriate defibrillator (CRT-D) therapy rates are low. METHODS: Primary prevention patients with a class I indication for CRT were prospectively enrolled and assigned to CRT-D or CRT pacemaker according to physician's criteria...
July 28, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28780038/sustained-reduction-of-tricuspid-regurgitation-after-percutaneous-repair-with-the-mitraclip-system-in-a-patient-with-a-dual-chamber-pacemaker
#17
Damiano Regazzoli, Alfonso Ielasi, Giuseppe Lanzillo, Marco Bruno Ancona, Eustachio Agricola, Francesco Giannini, Antonio Mangieri, Francesco Ancona, Jorg Hausleiter, Michael Nabauer, Antonio Colombo, Azeem Latib
No abstract text is available yet for this article.
July 27, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28779242/laparoscopic-resection-of-multiple-aneurysms-of-the-gastroepiploic-arterial-arcade
#18
Andrea Bertolucci, Dario Tartaglia, Luigi Cobuccio, Christian Galatioto, Massimo Chiarugi
BACKGROUND: Gastroepiploic arterial aneurysms (GEAA) represent a very rare disorder [1, 2]. The risk of GEAA rupture is high, and it is associated with a high mortality rate [3]. GEAAs are usually identified following rupture or are incidentally diagnosed. In emergency, an open surgical approach to treat GEAAs has been most frequently reported [4]. Alternatively, if the patient is hemodynamically stable, an angiography and embolization can be attempted. Herein we report the case of a patient presenting with two fissurated GEAAs that were successfully excised laparoscopically after failure of the endovascular approach...
August 4, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28778946/subclinical-atrial-fibrillation-in-older-patients
#19
Jeffrey S Healey, Marco Alings, Andrew C Ha, Peter Leong-Sit, David H Birnie, Jacob J de Graaf, Michel Freericks, Atul Verma, Jia Wang, Darryl Leong, Hisham Dokainish, Francois Philippon, Walid Barake, William F McIntyre, Kim D Simek, Michael D Hill, Shamir R Mehta, Mark Carlson, Frank Smeele, A Shekhar Pandey, Stuart J Connolly
Background -Long-term continuous electrocardiographic monitoring shows a substantial prevalence of asymptomatic, subclinical atrial fibrillation (SCAF) in patients with pacemakers and patients with cryptogenic stroke. It is unknown if SCAF is also common in other patients without these conditions. Methods -We implanted sub-cutaneous electrocardiographic monitors (St. Jude CONFIRM-AF) in patients ≥ 65 years attending cardiovascular or neurology outpatient clinics if they had no history of atrial fibrillation (AF) but did have any of: CHA2DS2-VASc score of ≥ 2, sleep apnea, or body mass index > 30...
August 4, 2017: Circulation
https://www.readbyqxmd.com/read/28778735/electrophysiology-catheter-facilitated-coronary-sinus-cannulation-and-implantation-of-cardiac-resynchronization-therapy-systems
#20
Antonis S Manolis, Spyridon Koulouris, Dimitris Tsiachris
BACKGROUND: Cardiac resynchronization therapy (CRT) device implantation is hampered by difficult placement of the left ventricular (LV) lead. We have routinely employed a steerable electrophysiology catheter to guide coronary sinus (CS) cannulation and facilitate LV lead positioning. The aim of this prospective study is to present our results with this approach in 138 consecutive patients receiving a CRT device over 10 years. METHODS: The study included 120 men and 18 women, aged 64...
August 1, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
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