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Ventricular arrhythmias

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https://www.readbyqxmd.com/read/28440739/featured-article-pharmacological-postconditioning-with-delta-opioid-attenuates-myocardial-reperfusion-injury-in-isolated-porcine-hearts
#1
Maria Seewald, James A Coles, Daniel C Sigg, Paul A Iaizzo
Ischemic preconditioning has been utilized to protect the heart from ischemia prior to ischemia onset, whereas postconditioning is employed to minimize the consequences of ischemia at the onset of reperfusion. The underlying mechanisms and pathways of ischemic pre- and postconditioning continue to be investigated as therapeutic targets. We evaluated the administration of a delta opioid agonist or cariporide on various parameters associated with myocardial reperfusion injury upon reperfusion of isolated porcine hearts...
May 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28436550/epicardial-brugada-syndrome-ablation-unmasking-inferior-j-waves
#2
Adam Lee, Heidi Kohler, Daniel Wright, Haris M Haqqani
Patients with Brugada syndrome are at risk of life threatening ventricular arrhythmias. Epicardial substrate ablation for Brugada syndrome has been described as a means of controlling these arrhythmias and recent reports describe elimination of the Brugada phenotype with ablation. We describe a unique case in which a patient developed inferior J waves with an early repolarization-type electrocardiogram following successful epicardial infundibular substrate ablation (which eliminated the Brugada syndrome ECG on ajmaline challenge)...
April 24, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28436171/sex-and-regional-differences-in-rabbit-right-ventricular-l-type-calcium-current-levels-and-mathematical-modeling-of-arrhythmia-vulnerability
#3
Zane M Kalik, Joshua L Mike, Cassandra Slipski, Moriah Wright, Jozsi Z Jalics, Mark D Womble
Previous studies have shown that adult rabbit left ventricular myocytes exhibit sex and regional differences in L-type calcium current (ICa-L ) levels that contribute to increased susceptibility to arrhythmogenic early afterdepolarizations (EADs). We used patch clamp recordings from isolated adult male and female rabbit right ventricular myocytes to determine apex-base differences in ICa-L density, and mathematical modeling to examine ICa-L contribution to EAD formation. Current density measured at 0 mV in female base myocytes was 67% higher than male base myocytes and 55% higher than female apex myocytes...
April 24, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28434969/translational-science-approach-for-assessment-of-cardiovascular-effects-and-proarrhythmogenic-potential-of-the-beta-3-adrenergic-agonist-mirabegron
#4
Cees Korstanje, Masanori Suzuki, Koichiro Yuno, Shuichi Sato, Masashi Ukai, Marlowe J Schneidkraut, Gan X Yan
INTRODUCTION: Translational assessment of cardiac safety parameters is a challenge in clinical development of beta-3 adrenoceptor agonists. The preclinical tools are presented that were used for assessing human safety for mirabegron. METHODS: Studies were performed on electrical conductance at ion channels responsible for cardiac repolarization (IKr, IKs, Ito, INa, and ICa,L), on QT-interval, subendocardial APD90, Tpeak-end interval, and arrhythmia's in ventricular dog wedge tissue in vitro and on cardiovascular function (BP, HR, and QTc) in conscious dogs...
April 20, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28433554/catheter-ablation-to-prevent-sudden-cardiac-death
#5
Josef Kautzner, Petr Peichl
Since ventricular arrhythmias are a common cause of sudden cardiac death (SCD), treatment for ventricular arrhythmias is the target area of interest in research field. Among different means to prevent ventricular arrhythmias, catheter ablation (CA) has emerged as an effective therapeutic method. CA can decrease the likelihood of SCD in the following arrhythmia categories: 1) idiopathic ventricular fibrillation (VF) that is usually triggered by premature ventricular beats originating in the Purkinje fibres; 2) VF in subjects with structural heart disease, especially after myocardial infarction, that is triggered by premature ventricular beats from surviving Purkinje fibres; 3) Brugada syndrome in which modification of an epicardial substrate in the right ventricular outflow tract might be the most promising strategy; 4) recurrent monomorphic ventricular tachycardias in the setting of structural heart disease; 5) ventricular preexcitation in which CA appears to be a method of choice in high risk patients, regardless of the presence or absence of symptoms...
April 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28432673/prognostic-value-of-left-ventricular-dyssynchrony-evaluated-by-gated-myocardial-perfusion-imaging-in-patients-with-chronic-kidney-disease-and-normal-perfusion-defect-scores
#6
Hiroaki Mori, Satoshi Isobe, Susumu Suzuki, Kazumasa Unno, Ryota Morimoto, Naoaki Kano, Takahiro Okumura, Yoshinari Yasuda, Katsuhiko Kato, Toyoaki Murohara
BACKGROUND: This study aimed to investigate whether indices of left ventricular (LV) dyssynchrony by gated myocardial perfusion SPECT (GMPS) could be useful to predict prognosis in chronic kidney disease (CKD) patients with normal perfusion defect scores. METHODS: One hundred and sixty-seven CKD patients with normal perfusion defect scores on adenosine-stress (201)Tl GMPS and no previous history of overt heart diseases were enrolled. Phase standard deviation (PSD) and bandwidth (BW) were automatically calculated from GMPS...
April 21, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28432604/phosphate-imbalance-in-patients-with-heart-failure
#7
REVIEW
E C Christopoulou, T D Filippatos, E Megapanou, M S Elisaf, G Liamis
Patients with heart failure often exhibit electrolyte abnormalities, such as hyponatremia or hypokalemia/hyperkalemia. Although not as common as the other electrolyte disturbances observed in patients with heart failure, phosphate imbalance is also of high importance in this population. The aim of this review is to present the mechanisms of low or high phosphate serum levels in patients with heart failure and its role in the pathogenesis and progression of heart dysfunction. Hypophosphatemia in patients with heart failure may be the result of co-existing electrolyte and acid-base abnormalities, pharmacological treatments, decreased intestinal absorption or secondary to sympathetic nervous system activation and co-morbidities, such as diabetes mellitus or heavy alcohol consumption...
April 22, 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/28432528/conventional-acupuncture-for-cardiac-arrhythmia-a-systematic-review-of-randomized-controlled-trials
#8
Jing Liu, Si-Nai Li, Lu Liu, Kun Zhou, Yan Li, Xiao-Yun Cui, Jie Wan, Jin-Jin Lu, Yan-Chao Huang, Xu-Sheng Wang, Qian Lin
OBJECTIVE: To exam the effect and safety of conventional acupuncture (CA) on cardiac arrhythmia. METHODS: Nine medical databases were searched until February 2016 for randomized controlled trials. Heterogeneity was measured by Cochran Q test. Meta-analysis was conducted if I(2) was less than 85% and the characteristics of included trials were similar. RESULTS: Nine qualified studies involving 638 patients were included. Only 1 study had definitely low risk of bias, while 7 trials were rated as unclear and 1 as high...
April 22, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28432194/diagnostic-value-of-prehospital-ecg-in-acute-stroke-patients
#9
Tobias Bobinger, Bernd Kallmünzer, Markus Kopp, Natalia Kurka, Martin Arnold, Stefan Heider, Stefan Schwab, Martin Köhrmann
OBJECTIVE: To investigate the diagnostic yield of prehospital ECG monitoring provided by emergency medical services in the case of suspected stroke. METHODS: Consecutive patients with acute stroke admitted to our tertiary stroke center via emergency medical services and with available prehospital ECG were prospectively included during a 12-month study period. We assessed prehospital ECG recordings and compared the results to regular 12-lead ECG on admission and after continuous ECG monitoring at the stroke unit...
April 21, 2017: Neurology
https://www.readbyqxmd.com/read/28431070/emerging-molecular-therapies-targeting-myocardial-infarction-related-arrhythmias
#10
Helen E Driessen, Toon A B van Veen, Gerard J J Boink
Cardiac disease is the leading cause of death in the developed world. Ventricular arrhythmias associated with myocardial ischaemia and/or infarction are a major contributor to cardiovascular mortality, and require improved prevention and treatment. Drugs, devices, and radiofrequency catheter ablation have made important inroads, but have significant limitations ranging from incomplete success to undesired toxicities and major side effects. These limitations derive from the nature of the intervention. Drugs are frequently ineffective, target the entire heart, and often do not deal with the specific arrhythmia trigger or substrate...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28431055/electrocardiographic-differentiation-of-idiopathic-right-ventricular-outflow-tract-ectopy-from-early-arrhythmogenic-right-ventricular-cardiomyopathy
#11
Jan Novak, Alessandro Zorzi, Silvia Castelletti, Antonis Pantasis, Ilaria Rigato, Domenico Corrado, William Mckenna, Pier D Lambiase
Aims: The differentiation between idiopathic right ventricular outflow tract (RVOT) arrhythmias and early arrhythmogenic right ventricular cardiomyopathy (ARVC) can be challenging. We aimed to assess whether QRS morphological features and coupling interval of ventricular ectopic beats (VEBs) can improve differentiation between the two conditions. Methods and Results: Twenty desmosomal-gene mutation carriers (13 females, mean age 43 years) with no or mild ARVC phenotypic expression and 33 age- and sex-matched subjects with idiopathic RVOT arrhythmias were studied...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28430892/anti-arrhythmic-potential-of-the-late-sodium-current-inhibitor-gs-458967-in-murine-scn5a-1798insd-and-human-scn5a-1795insd-ipsc-derived-cardiomyocytes
#12
Vincent Portero, Simona Casini, Maaike Hoekstra, Arie O Verkerk, Isabella Mengarelli, Luiz Belardinelli, Sridharan Rajamani, Arthur A M Wilde, Connie R Bezzina, Marieke W Veldkamp, Carol Ann Remme
AIM: Selective inhibition of cardiac late sodium current (INaL) is an emerging target in the treatment of ventricular arrhythmias. We investigated the electrophysiological effects of GS-458967 (GS967), a potent, selective inhibitor of INaL, in an overlap syndrome model of both gain and loss of sodium channel function, comprising cardiomyocytes derived from both human SCN5A-1795insD+/- induced pluripotent stem cells (hiPSC-CMs) and mice carrying the homologous mutation Scn5a-1798insD+/-...
April 18, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28430698/the-right-ventricle-is-dilated-during-resuscitation-from-cardiac-arrest-caused-by-hypovolemia-a-porcine-ultrasound-study
#13
Rasmus Aagaard, Asger Granfeldt, Morten T Bøtker, Troels Mygind-Klausen, Hans Kirkegaard, Bo Løfgren
OBJECTIVES: Dilation of the right ventricle during cardiac arrest and resuscitation may be inherent to cardiac arrest rather than being associated with certain causes of arrest such as pulmonary embolism. This study aimed to compare right ventricle diameter during resuscitation from cardiac arrest caused by hypovolemia, hyperkalemia, or primary arrhythmia (i.e., ventricular fibrillation). DESIGN: Thirty pigs were anesthetized and then randomized to cardiac arrest induced by three diffrent methods...
April 20, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28430116/ghrelin-expression-and-significance-in-92-patients-with-atrial-fibrillation
#14
Tianyi Ma, Yujiang Su, Shijuan Lu, Moshui Chen, Jianghua Zhong, Zhihong Zhou, Dingjun Sun, Hui Yang, Xue Ao
OBJECTIVE: Ghrelin is a polypeptide that is closely associated with many cardiovascular diseases, such as hypertension, atherosclerosis, and heart failure. This article aims to understand the expression of ghrelin in patients with atrial fibrillation (AF). METHODS: A total of 182 patients with non-valvular heart diseases were recruited, among whom 92 had AF and 90 had sinus arrhythmia (SA). The serum ghrelin amount was tested by the ELASA method. Moreover, blood sugar, lipids, liver function, and renal function were tested...
April 10, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28428622/inhibition-of-late-sodium-current-suppresses-calcium-related-ventricular-arrhythmias-by-reducing-the-phosphorylation-of-camk-ii-and-sodium-channel-expressions
#15
Xiao-Hong Wei, Shan-Dong Yu, Lu Ren, Si-Hui Huang, Qiao-Mei Yang, Ping Wang, Yan-Peng Chu, Wei Yang, Yan-Sheng Ding, Yong Huo, Lin Wu
Cardiac arrhythmias associated with intracellular calcium inhomeostasis are refractory to antiarrhythmic therapy. We hypothesized that late sodium current (I Na) contributed to the calcium-related arrhythmias. Monophasic action potential duration at 90% completion of repolarization (MAPD90) was significantly increased and ventricular arrhythmias were observed in hearts with increased intracellular calcium concentration ([Ca(2+)]i) by using Bay K 8644, and the increase became greater in hearts treated with a combination of ATX-II and Bay K 8644 compared to Bay K 8644 alone...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427867/outcomes-from-anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-repair-long-term-complications-in-relation-to-residual-myocardial-abnormalities
#16
Miki Kanoh, Kei Inai, Tokuko Shinohara, Hirofumi Tomimatsu, Toshio Nakanishi
BACKGROUND: Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital coronary artery irregularity. This study aimed to clarify the long-term postoperative outcomes in ALCAPA patients, and to compare the infantile and adult types. METHODS: We retrospectively analyzed the clinical data from 33 patients with ALCAPA who underwent surgical repairs after 1980. The patients were grouped based on whether presentation occurred before (infantile type: n=14) or after (adult type: n=19) 1 year of age...
April 17, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28427417/novel-trigenic-cacna1c-des-mypn-mutations-in-a-family-of-hypertrophic-cardiomyopathy-with-early-repolarization-and-short-qt-syndrome
#17
Yanhong Chen, Hector Barajas-Martinez, Dongxiao Zhu, Xihui Wang, Chonghao Chen, Ruijuan Zhuang, Jingjing Shi, Xueming Wu, Yijia Tao, Weidong Jin, Xiaoyan Wang, Dan Hu
BACKGROUND: Hypertrophic cardiomyopathy (HCM) patients with early repolarization (ER) pattern are at higher risk of ventricular arrhythmia, yet the genetic background of this situation has not been well investigated. Here we report novel trigenic mutations detected in a Chinese family of obstructive HCM with ER and short QT syndrome (SQTS). METHODS: Proband and family members underwent detailed medical assessments. DNAs were extracted from peripheral blood leukocytes for genetic screening with next generation method...
April 20, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28425317/mortality-risk-factors-from-converting-off-pump-coronary-artery-bypass-to-on-pump-coronary-artery-bypass
#18
Na Miao, Feng Yang, Zhongtao Du, Chunjing Jiang, Xing Hao, Jinhong Wang, Yu Jiang, Xiaofang Yang, Haixiu Xie, Xiaotong Hou
INTRODUCTION: A number of large-scale retrospective studies revealed that off-pump coronary artery bypass (OPCAB) was superior to on-pump coronary artery bypass (ONCAB). The aim of the study was to investigate risk factors for mortality when OPCAB is converted to ONCAB. METHODS: Patients who underwent OPCAB conversion to ONCAB at the Beijing Anzhen Hospital between January 2003 and January 2013 were assigned to the non-survivor and survivor groups. Background demographics, illness history and preoperative, intraoperative and postoperative variables were compared...
April 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28425222/class-iii-antiarrhythmic-drugs-amiodarone-and-dronedarone-impair-kir-2-1-backward-trafficking
#19
Yuan Ji, Hiroki Takanari, Muge Qile, Lukas Nalos, Marien J C Houtman, Fee L Romunde, Raimond Heukers, Paul M P van Bergen En Henegouwen, Marc A Vos, Marcel A G van der Heyden
Drug-induced ion channel trafficking disturbance can cause cardiac arrhythmias. The subcellular level at which drugs interfere in trafficking pathways is largely unknown. KIR 2.1 inward rectifier channels, largely responsible for the cardiac inward rectifier current (IK1 ), are degraded in lysosomes. Amiodarone and dronedarone are class III antiarrhythmics. Chronic use of amiodarone, and to a lesser extent dronedarone, causes serious adverse effects to several organs and tissue types, including the heart. Both drugs have been described to interfere in the late-endosome/lysosome system...
April 19, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28424631/mechanisms-underlying-the-emergence-of-post-acidosis-arrhythmia-at-the-tissue-level-a-theoretical-study
#20
Jieyun Bai, Renli Yin, Kuanquan Wang, Henggui Zhang
Acidosis has complex electrophysiological effects, which are associated with a high recurrence of ventricular arrhythmias. Through multi-scale cardiac computer modeling, this study investigated the mechanisms underlying the emergence of post-acidosis arrhythmia at the tissue level. In simulations, ten Tusscher-Panfilov ventricular model was modified to incorporate various data on acidosis-induced alterations of cellular electrophysiology and intercellular electrical coupling. The single cell models were incorporated into multicellular one-dimensional (1D) fiber and 2D sheet tissue models...
2017: Frontiers in Physiology
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