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https://www.readbyqxmd.com/read/28800884/ionic-mechanisms-of-the-action-of-anaesthetics-on-sinoatrial-node-automaticity
#1
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/28795030/comparison-of-the-outcomes-between-surgical-aortic-valve-replacement-and-transcatheter-aortic-valve-replacement-in-patients-aged-above-80
#2
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
#3
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
#4
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/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
#5
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/28776362/acute-heart-failure-and-rhabdomyolysis-a-clue-for-the-diagnosis-of-polymyositis-with-cardiac-involvement
#6
P Pinto-Lopes, L Carneiro-Leão, R Morais, J Pinheiro, A Vieira Lopes, P Bettencourt
Polymyositis is an idiopathic inflammatory myopathy, characterized by proximal muscle weakness and sometimes extramuscular manifestations. We report the case of a 51-year-old male, with history of complete heart block, which required pacemaker implantation, and subsequently heart failure, presenting to the emergency department with worsening of dyspnea and peripheral edema. He was admitted to the Internal Medicine ward with acute heart failure and started on diuretic therapy. During hospitalization, he was discovered to have marked rhabdomyolysis...
August 3, 2017: Reumatismo
https://www.readbyqxmd.com/read/28769025/delayed-pacemaker-generator-pocket-and-lead-primary-infection-due-to-burkholderia-cepacia
#7
Fatma Ben Abid, Hussam Al-Saoub, Faraj Howadi, Ahmed AlBishawi, Maliha Thapur
BACKGROUND Recently, the use of cardiac implantable electrophysiological devices (CIEDs) has increased. Advances in medical technology, an increasingly aging population, increases in clinical indications, and expanded medical insurance coverage for these devices have all contributed to this trend. Infection is considered to be one of the most serious complications of CIEDs and carries a significant risk of morbidity and mortality. Although infection with Staphylococcus sp. accounts for the majority of cases, other bacteria have been implicated as causative agents of infection of CIEDs...
August 3, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28768449/recurrent-fuo-due-to-intermittent-enterobacter-cloacae-bacteremias-from-an-infected-pacemaker-lead-diagnosed-by-gallium-scan
#8
Burke A Cunha, Ismail Jimada
Fever of unknown origin (FUO) refers to fevers of ≥101° F that persist for ≥3 weeks and remain undiagnosed after a focused inpatient or outpatient workup. FUO may be due to infectious, malignant/neoplastic, rheumatic/inflammatory, or miscellaneous disorders. Recurrent FUOs are due to the same causes of classical FUOs. Recurrent FUOs may have continuous or intermittent fevers and are particularly difficult to diagnose. With intermittent fever, recurrent FUO diagnostic tests are best obtained during fever episodes...
August 2, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28760721/transcatheter-aortic-valve-implantation-versus-re-do-surgery-for-failing-surgical-aortic-bioprosthesis-a-multi-centre-propensity-score-analysis
#9
Marco Spaziano, Darren Mylotte, Pascal Thériault-Lauzier, Ole De Backer, Lars Søndergaard, Johan Bosmans, Nicolas Debry, Thomas Modine, Marco Barbanti, Corrado Tamburino, Jan-Malte Sinning, Eberhard Grube, Georg Nickenig, Fritz Mellert, Sabine Bleiziffer, Rüdiger Lange, Benoit de Varennes, Kevin Lachapelle, Giuseppe Martucci, Nicolo Piazza
AIMS: Transcatheter aortic valve implantation for a failing surgical bioprosthesis (TAV- in-SAV) has become an alternative for patients at high risk for redo surgical aortic valve replacement (redo-SAVR). Comparisons between these approaches are non-existent. This study aims to compare clinical and echocardiographic outcomes of patients undergoing TAV-in-SAV versus redo-SAVR after accounting for baseline differences by propensity score matching. METHODS AND RESULTS: Patients from 7 centres in Europe and Canada who had undergone either TAV- in-SAV (n=79) or redo-SAVR (n=126) were identified...
August 1, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28760205/probing-oral-anticoagulation-in-patients-with-atrial-high-rate-episodes-rationale-and-design-of-the-non-vitamin-k-antagonist-oral-anticoagulants-in-patients-with-atrial-high-rate-episodes-noah-afnet-6-trial
#10
Paulus Kirchhof, Benjamin F Blank, Melanie Calvert, A John Camm, Gregory Chlouverakis, Hans-Christoph Diener, Andreas Goette, Andrea Huening, Gregory Y H Lip, Emmanuel Simantirakis, Panos Vardas
Oral anticoagulation prevents ischemic strokes in patients with atrial fibrillation (AF). Early detection of AF and subsequent initiation of oral anticoagulation help to prevent strokes in AF patients. Implanted cardiac pacemakers and defibrillators allow seamless detection of atrial high rate episodes (AHRE), but the best antithrombotic therapy in patients with AHRE is not known. RATIONALE: Stroke risk is higher in pacemaker patients with AHRE than in those without, but the available data also show that stroke risk in patients with AHRE is lower than in patients with AF...
August 2017: American Heart Journal
https://www.readbyqxmd.com/read/28756933/pericardial-herniation-of-small-bowel-post-minimally-invasive-hybrid-maze-of-atrial-fibrillation
#11
David A Farcy, Angelo Lapietra, Benjamin N Abo, Michael Dalley
BACKGROUND: Herniation of intraabdominal contents into the pericardial cavity is exceptionally rare, and when seen, it is most often the result of trauma, postsurgical complication, or genetic defect. There have been only a few case reports describing spontaneous bowel herniation into the pericardium in minimally invasive cardiac procedures like cardiac ablation, pacemaker placement, and minimally invasive coronary artery bypass graft. CASE REPORT: We report the case of a 65-year-old man who presented to an urgent care center complaining of abdominal and chest pain...
July 27, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28756079/-exercise-testing-new-guidelines
#12
Dany Michel Marcadet
The GERS (Exercise Rehabilitation and Sports Group of the French Society of Cardiology) has decided to update current guidelines regarding the practice of EKG stress tests. Since the last update dates from 1997, the GERS judged it necessary to integrate data from new works and advancements made in the last 20 years. Good clinical practices and safety conditions are better defined regarding the structure, location, material, staff competency, as well as convention with hospital structures. The diagnosis of coronary artery disease remains the principal indication for a stress test...
July 26, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/28747842/combined-application-of-extracorporeal-membrane-oxygenation-and-an-artificial-pacemaker-in-fulminant-myocarditis-in-a-child
#13
Sheng Ye, Lvchan Zhu, Botao Ning, Chenmei Zhang
Fulminant myocarditis is severe and aggressive, but it is self-limited and usually has a favorable prognosis if the patients can survive the acute phase. When drug treatment is not effective, extracorporeal membrane oxygenation technology should be applied to support cardiopulmonary function. Extracorporeal membrane oxygenation can simultaneously support function of the left ventricle, right ventricle, and lungs, and provide stable blood circulation for patients with heart and respiratory failure, which allows sufficient time for the cardiopulmonary system to recover...
June 2017: Türk Pediatri Arşivi
https://www.readbyqxmd.com/read/28738900/impact-of-ablation-duration-on-rhythm-outcome-after-concomitant-maze-procedure-using-cryoablation-in-patients-with-persistent-atrial-fibrillation
#14
Dong Seop Jeong, Ji Hoon You, Chang-Seok Jeon, Pyo Won Park, Kiick Sung, Wook Sung Kim, Young Tak Lee
BACKGROUND: The aim of this study was to evaluate the impact of ablation duration during a maze procedure using a nitrous oxide-based cryosurgical system. METHODS: From May 2001 to December 2006, 256 consecutive patients who underwent a concomitant maze procedure using nitrous oxide-based cryoablation for chronic atrial fibrillation (AF) during cardiac surgery were enrolled. The ablation duration for each lesion was between 120 s at -60 °C in 140 patients (control group) and 160 s in 116 patients (long duration group)...
July 24, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28734885/clinical-impact-of-baseline-right-bundle-branch-block-in-patients-undergoing-transcatheter-aortic-valve-replacement
#15
Vincent Auffret, John G Webb, Hélène Eltchaninoff, Antonio J Muñoz-García, Dominique Himbert, Corrado Tamburino, Luis Nombela-Franco, Fabian Nietlispach, César Morís, Marc Ruel, Antonio E Dager, Vicenç Serra, Asim N Cheema, Ignacio J Amat-Santos, Fábio Sandoli de Brito, Pedro Alves Lemos, Alexandre Abizaid, Rogério Sarmento-Leite, Eric Dumont, Marco Barbanti, Eric Durand, Juan H Alonso Briales, Alec Vahanian, Claire Bouleti, Sebastiano Immè, Francesco Maisano, Raquel Del Valle, Luis Miguel Benitez, Bruno García Del Blanco, Rishi Puri, François Philippon, Marina Urena, Josep Rodés-Cabau
OBJECTIVES: This study sought to assess the influence of baseline right bundle branch block (RBBB) on all-cause and cardiovascular mortality as well as sudden cardiac death (SCD) among patients undergoing transcatheter aortic valve replacement (TAVR). BACKGROUND: Few data exist regarding the late clinical impact of pre-existing RBBB in TAVR recipients. METHODS: A total of 3,527 patients (mean age 82 ± 8 years, 50.1% men) were evaluated according to the presence of RBBB on baseline electrocardiography...
July 13, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28733766/magnetic-resonance-imaging-in-patients-with-cardiac-implantable-electronic-devices-a-single-center-prospective-study
#16
Mrinal Yadava, Matthew Nugent, Angela Krebsbach, Jessica Minnier, Peter Jessel, Charles A Henrikson
PURPOSE: Cardiac implantable electronic devices (CIEDs) have traditionally been a contraindication for magnetic resonance imaging (MRI). Recent studies suggest that MRI can be conducted safely in select patients with pacemakers (PPMs) and implantable cardioverter defibrillators (ICDs). We sought to determine the safety of MRI in patients with CIEDs, using a protocol for patient selection and device programming. METHODS: This is a prospective, single-center study...
July 22, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28733677/inductively-powered-wireless-pacing-via-a-miniature-pacemaker-and-remote-stimulation-control-system
#17
Parinaz Abiri, Ahmad Abiri, René R Sevag Packard, Yichen Ding, Alireza Yousefi, Jianguo Ma, Malcolm Bersohn, Kim-Lien Nguyen, Dejan Markovic, Shervin Moloudi, Tzung K Hsiai
Pacemakers have existed for decades as a means to restore cardiac electrical rhythms. However, lead-related complications have remained a clinical challenge. While market-released leadless devices have addressed some of the issues, their pacer-integrated batteries cause new health risks and functional limitations. Inductive power transfer enables wireless powering of bioelectronic devices; however, Specific Absorption Rate and size limitations reduce power efficiency for biomedical applications. We designed a remote-controlled system in which power requirements were significantly reduced via intermittent power transfer to control stimulation intervals...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728694/alcohol-septal-ablation-for-obstructive-hypertrophic-cardiomyopathy-a-word-of%C3%A2-endorsement
#18
REVIEW
Max Liebregts, Pieter A Vriesendorp, Jurrien M Ten Berg
Twenty years after the introduction of alcohol septal ablation (ASA) for the treatment of obstructive hypertrophic cardiomyopathy, the arrhythmogenicity of the ablation scar appears to be overemphasized. When systematically reviewing all studies comparing ASA with myectomy with long-term follow-up, (aborted) sudden cardiac death and mortality rates were found to be similarly low. The focus should instead shift toward lowering the rate of reinterventions and pacemaker implantations following ASA because, in this area, ASA still seems inferior to myectomy...
July 25, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28722339/structured-pain-management-reduces-patient-discomfort-after-catheter-ablation-and-rhythm-device-surgery
#19
M Dörschner, A Bollmann, B Dinov, S Richter, M Döring, A Arya, A Müssigbrodt, S Kircher, N Dagres, P Sommer, G Hindricks, K Bode
BACKGROUND: The goal was to test the effectiveness of a structured pain management programme after invasive electrophysiological interventions in cardiology including ablation of atrial fibrillation (AF) or ventricular tachycardia (VT) and implantation, or explantation, of pacemakers or implantable cardioverter defibrillators. METHODS: This was a prospective study with a pre-/post-design where a post-intervention group (116 consecutive patients) was compared to a pre-intervention group (102 consecutive patients) after implementation of a structured pain-management programme using the numeric rating scale (NRS 0-10) and classified as moderate-to-severe if NRS > 3...
July 18, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28718277/clinical-implications-of-long-term-ecg-monitoring-from-loop-recorder-to-devices-remote-control
#20
Andrea DI Cori, Raffaele DE Lucia
Long term ECG monitoring has become nowadays an indispensable technology for prevention, management and treatment of many cardiac issues. Today long term ECG monitoring is achievable through loop recorders (LR) and cardiac devices (CIED) like pacemaker (PM), implantable cardioverter-defibrillators (ICDs) and cardiac resynchronization therapy device-defibrillators (CRT- Ds), all of which associated with remote monitoring (RM). Targeted long term ECG monitoring Patients who have recurrent non documented episodes of palpitations, unexplained episodes of syncope, cryptogenic stroke or patients with a cardiomiopathy needing a risk stratification, may benefit from long term ECG monitoring...
July 18, 2017: Minerva Cardioangiologica
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