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https://www.readbyqxmd.com/read/29315578/hcn4-pacemaker-channels-attenuate-the-parasympathetic-response-and-stabilize-the-spontaneous-firing-of-sinoatrial-node
#1
Yuko Kozasa, Noriyuki Nakashima, Masayuki Ito, Taisuke Ishikawa, Hiroki Kimoto, Kazuo Ushijima, Naomasa Makita, Makoto Takano
The heart rate is dynamically controlled by the sympathetic and parasympathetic nervous systems that regulate the sinoatrial node (SAN). HCN4 pacemaker channels are well-known causative molecule of congenital sick sinus syndrome. Although HCN4 channels are activated by cAMP, the sympathetic response of SAN was preserved in the patients carrying loss-of-function mutations of HCN4 gene. In order to clarify the contribution of HCN4 channels in the autonomic regulation of SAN, we developed novel gain-of-function mutant mice in which expression level of HCN4 channels could be reversibly changed from zero to ∼3 times of that in wild type mice, using tetracycline trans-activator and tetracycline responsive element...
January 9, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29250217/atrial-fibrillation-is-associated-with-increased-pacemaker-implantation-rates-in-the-placement-of-aortic-transcatheter-valve-partner-trial
#2
Angelo B Biviano, Tamim Nazif, Jose Dizon, Hasan Garan, Mark Abrams, Jessica Fleitman, Dua Hassan, Samir Kapadia, Vasilis Babaliaros, Ke Xu, Josep Rodes-Cabau, Wilson Y Szeto, William F Fearon, Danny Dvir, Todd Dewey, Mathew Williams, Steven Kindsvater, Michael J Mack, John G Webb, D Craig Miller, Craig R Smith, Martin B Leon, Susheel Kodali
Atrial fibrillation (AF) is associated with worse outcomes in many cardiovascular diseases. There are few data examining pacemaker implantation rates and indications in patients with AF who undergo transcatheter aortic valve replacement (TAVR). To examine the impact of AF on the incidence of and indications for pacemakers in patients undergoing TAVR, we evaluated data of 1723 patients without pre-existing pacemakers who underwent TAVR in the Placement of AoRTic TraNscathetER Valve (PARTNER) trial. Permanent pacemaker implantation rates and indications were compared in groups based on baseline and discharge heart rhythm: sinus rhythm (SR) vs...
June 2017: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/29248960/predictors-of-the-need-for-pacemaker-implantation-after-the-cox-maze-iv-procedure-for-atrial-fibrillation
#3
Naoki Masaki, Shunsuke Kawamoto, Naotaka Motoyoshi, Osamu Adachi, Kiichiro Kumagai, Satoshi Kawatsu, Yukihiro Hayatsu, Shintaro Katahira, Katsuhiro Hosoyama, Masatoshi Akiyama, Yoshikatsu Saiki
PURPOSE: The Cox maze IV (CMIV) procedure is being used increasingly frequently for surgical ablation of atrial fibrillation (AF). This study aimed to identify the risk factors of the need for postoperative pacemaker implantation (PMI) after CMIV. METHODS: Preoperative, intraoperative, and postoperative data were retrospectively collected from 67 consecutive patients who underwent CMIV at our institution; 7 (10.4%) required PMI (as a treatment of brady AF or sick sinus syndrome)...
December 16, 2017: Surgery Today
https://www.readbyqxmd.com/read/29192587/the-proportion-of-asymptomatic-recurrence-after-catheter-ablation-of-atrial-fibrillation-in-patients-with-a-pacemaker-for-sick-sinus-syndrome
#4
Yuki Osaka, Masateru Takigawa, Atsushi Takahashi, Taishi Kuwahara, Kenji Okubo, Yoshihide Takahashi, Yasuaki Tanaka, Naohiko Kawaguchi, Kazuya Yamao, Yuji Watari, Emiko Nakashima, Jun Nakajima, Katsumasa Takagi, Tadashi Fujino, Shigeki Kimura, Hiroyuki Hikita, Kenzo Hirao, Mitsuaki Isobe
BACKGROUND: Catheter ablation (CA) of paroxysmal atrial fibrillation (PAF) is an effective treatment. However, the frequency of asymptomatic AF recurrence after CA in patients with PAF and sick sinus syndrome (SSS) is not clear. The aim of this study was to elucidate the real AF recurrence after CA in patients with PAF and a pacemaker for SSS. METHODS AND RESULTS: Fifty-one consecutive patients (mean age 66.6 ± 7.0 years, male 34) with PAF and SSS and pacemakers underwent CA...
September 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29166283/cardiac-disorders-in-dogs-infected-with-babesia-canis
#5
M Bartnicki, P Łyp, P Dębiak, M Staniec, S Winiarczyk, K Buczek, Ł Adaszek
The aim of this study was to assess cardiac disorders in dogs infected with B. canis. The study included 50 dogs with babesiosis and 20 healthy control animals. All the animals had haematological tests, ECG, echocardiography and serum troponin I and CK-MB levels checked. The haematology in the group of dogs with babesiosis confirmed thrombocytopaenia in 100% of dogs, decreased haematocrit in 52% and anaemia in 46%. The most common abnormalities in ECG and echocardiography in dogs infected with protozoa included: change in appearance and/or amplitude of the T-wave (34%), increased fractional shortening (24%), an increased sinus rhythm (14%) and heart axis deviation (10%)...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29139149/underrecognized%C3%A2-entity-of-the-transient-rise-in-the-atrial-capture-threshold-early-after-dual-chamber-pacemaker-implantation
#6
Yoshiko Uehara, Kentaro Yoshida, Akira Kimata, Kojiro Ogawa, Daisuke Abe, Yasuaki Tsumagari, Hidekazu Tsuneoka, Yoshiaki Yui, Yoko Ito, Mari Ebine, Noriyuki Takeyasu, Kazutaka Aonuma, Akihiko Nogami
BACKGROUND: Steroid-eluting pacemaker leads suppress acute rises in pacing threshold by preventing inflammatory processes. However, we occasionally encounter not persistent but transient rise in the atrial capture threshold (TRACT) early after pacemaker implantation. We believe that this phenomenon is underrecognized in clinical practice and may potentially lead to unnecessary reintervention. We aimed to clarify the prevalence, predictors, and possible mechanisms of TRACT. METHODS AND RESULTS: We reviewed clinical records from 239 consecutive patients who underwent dual-chamber pacemaker implantation for sick sinus syndrome (SSS) (N = 102) or atrioventricular block (AVB) (N = 137)...
November 15, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29105672/-sinus-bradycardia-and-syncope-what-pathophysiological-mechanism-and-what-management-of-the-patient
#7
Paolo Alboni, Nicola Stucci, Claudia Parisi
Sick sinus syndrome (SSS) can be diagnosed only when there is a clear correlation between symptoms and sinus node dysfunction. In the absence of such correlation, the mechanism of undocumented intermittent symptoms such as syncopal spells in patients with permanent mild sinus bradycardia remains uncertain. Some clinical data suggest that a reflex mechanism is likely to be involved in many patients with syncope and sinus bradycardia: the course of syncopal recurrences is very variable from patient to patient and transient loss of consciousness does not recur in more than half of unpaced patients during an observation period of several years...
November 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/29104201/-cardiac-perforation-after-pacemaker-implantation-report-of-a-case
#8
Yuko Ohashi, Kazuhiro Ohkura, Ayano Yamada
A 71-year-old woman was diagnosed with sick sinus syndrome (SSS) upon her cardiogenic cerebral embolism and underwent pacemaker implantation. Active fixation leads were positioned at the right atrial appendage and ventricular septum. Twenty-one days later at her routine checkup, she was asymptomatic and there were no signs of cardiac tamponade or pacing failure. But echocardiography and computed tomography revealed a large amount of pericardial effusion due to the lead perforation. We performed open drainage because her anticoagulant could not be stopped for her history of cerebral infarction...
November 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/29103011/seizure-triggered-by-sick-sinus-syndrome
#9
Nilesh Patel, Faisal Majeed, Anupam Ashutosh Sule
Sick sinus syndrome (SSS) is a dysfunction of sinoatrial node resulting in symptomatic bradycardia or sinus pauses causing decreased cardiac output with cerebral hypoperfusion and usually presents as syncope, presyncope or fatigue. The occurrence of a seizure is very rare. A 69-year-old man suffered two episodes of generalised tonic-clonic seizures. MRI and electroencephalogram failed to reveal the cause of seizures. In the emergency room, he experienced presyncope simultaneous to bradycardia and sinus pauses...
November 4, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29095320/transient-sick-sinus-syndrome-with-complete-atrioventricular-block-associated-with-ergonovine-intake-a-case-report
#10
Hui-Ting Wang, Wen-Hao Liu, Yung-Lung Chen
RATIONALE: More mature or older women are more likely to undergo in vitro fertilization and embryo implant. These women have a greater chance of receiving ergonovine therapy because of a suspected abortion. We present this case report to call attention to a latent lethal adverse effect in everyday obstetric practice using ergonovine. It requires more attention and close monitoring PATIENT CONCERNS:: We presented the case of a 38-year-old female patient with general weakness and mild chest tightness after ergonovine use...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28965962/spanish-pacemaker-registry-14th-official-report-of-the-spanish-society-of-cardiology-working-group-on-cardiac-pacing-2016
#11
Óscar Cano Pérez, Marta Pombo Jiménez, María Luisa Fidalgo Andrés, Diego Lorente Carreño, Raúl Coma Samartín
INTRODUCTION AND OBJECTIVES: This report describes the results of analysis of implanted pacemakers reported to the Spanish Pacemaker Registry. METHODS: The analysis was based on information provided by the European Pacemaker Identification Card. RESULTS: Information was received from 115 hospitals, with a total of 12 697 cards, representing 32.3% of the estimated activity. Use of conventional and resynchronization pacemakers was 818 and 79 units per million inhabitants, respectively...
December 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28965168/cardiac-arrhythmias-related-to-sodium-channel-dysfunction
#12
Eleonora Savio-Galimberti, Mariana Argenziano, Charles Antzelevitch
The voltage-gated cardiac sodium channel (Nav1.5) is a mega-complex comprised of a pore-forming α subunit and 4 ancillary β-subunits together with numerous protein partners. Genetic defects in the form of rare variants in one or more sodium channel-related genes can cause a loss- or gain-of-function of sodium channel current (INa) leading to the manifestation of various disease phenotypes, including Brugada syndrome, long QT syndrome, progressive cardiac conduction disease, sick sinus syndrome, multifocal ectopic Purkinje-related premature contractions, and atrial fibrillation...
October 1, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28964153/mechanism-underlying-impaired-cardiac-pacemaking-rhythm-during-ischemia-a-simulation-study
#13
Xiangyun Bai, Kuanquan Wang, Yongfeng Yuan, Qince Li, Halina Dobrzynski, Mark R Boyett, Jules C Hancox, Henggui Zhang
Ischemia in the heart impairs function of the cardiac pacemaker, the sinoatrial node (SAN). However, the ionic mechanisms underlying the ischemia-induced dysfunction of the SAN remain elusive. In order to investigate the ionic mechanisms by which ischemia causes SAN dysfunction, action potential models of rabbit SAN and atrial cells were modified to incorporate extant experimental data of ischemia-induced changes to membrane ion channels and intracellular ion homeostasis. The cell models were incorporated into an anatomically detailed 2D model of the intact SAN-atrium...
September 2017: Chaos
https://www.readbyqxmd.com/read/28926419/peduncular-hallucinosis-and-autonomic-dysfunction-in-anti-aquaporin-4-antibody-syndrome
#14
Renee Berry, Peter K Panegyres
Neuromyelitis optica is a rare, severe inflammatory demyelinating disease of the central nervous system, previously described as affecting only the optic nerve and spinal cord. Since the discovery of a highly specific autoantibody, anti-aquaporin-4, lesions are now recognized outside these regions. We report a man with severe, debilitating symptoms resulting from a symptomatic lesion within the diencephalon, manifesting with abnormal circadian rhythms, autonomic dysfunction, behavioral disturbance, and complex visual hallucinations...
September 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28912977/isolated-persistent-left-superior-vena-cava-sick-sinus-syndrome-and-challenging-pacemaker-implantation
#15
Hatice S Kemal, Aziz Gunsel, Levent Cerit, Murat Kocaoglu, Hamza Duygu
Persistent left superior vena cava with absent right superior vena cava is a very rare venous anomaly and is known as isolated PLSVC. It is usually an asymptomatic anomaly and is mostly detected during difficult central venous access or pacemaker implantation, though it could also be associated with an increased incidence of congenital heart disease, arrhythmias, and conduction disturbances. Herein, we describe a dual-chamber pacemaker implantation in a patient with isolated PLSVC and sick sinus syndrome.
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28891553/hyperthyroidism-and-sick-sinus-syndrome-a-rare-but-challenging-association-a-study-of-three-cases
#16
M Tudoran, C Tudoran
Hyperthyroidism is usually associated with sinus tachycardia or supraventricular tachyarrhythmias, but rarely with dysfunction of the sinus node or other conduction disturbances. Evidence of bradyarrhythmia in patients with hyperthyroidism is clinically relevant, but the fact that several drugs with negative chronotropic effects (beta-blockers and calcium channel antagonists) are frequently used in the management of these patients must be taken into account. In the presence of sick sinus syndrome (SSS) or other conductance disturbances, therapy with agents that delay the activity of sinus node or atrioventricular conduction can lead to extreme bradycardia with syncope...
August 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28828325/evaluation-of-death-among-the-patients-undergoing-permanent-pacemaker-implantation-a-competing-risks-analysis
#17
Haleh Ghaem, Mohammad Ghorbani, Samira Zare Dorniani
BACKGROUND: Permanent artificial pacemaker is one of the important therapies for treatment of cardiac conduction system problems. The present study aimed to determine the association between some predictive variables and all-cause and cause-specific mortality in the patients who had undergone pacemaker implantation. METHODS: This study was conducted on 1207 patients who had undergone permanent pacemaker implantation in the hospitals affiliated with Shiraz University of Medical Sciences, Iran, from Mar 2002 to Mar 2012...
June 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28805625/congenital-sick-sinus-syndrome-prenatal-diagnosis-and-postnatal-follow-up
#18
Jenn-Jhy Tseng, Ming-Chih Lin
No abstract text is available yet for this article.
August 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28803248/a-functional-assay-for-sick-sinus-syndrome-genetic-variants
#19
Chuanchau J Jou, Cammon B Arrington, Spencer Barnett, Jiaxiang Shen, Scott Cho, Xiaoming Sheng, Patrick C McCullagh, Neil E Bowles, Chase M Pribble, Elizabeth V Saarel, Thomas A Pilcher, Susan P Etheridge, Martin Tristani-Firouzi
BACKGROUND/AIMS: Congenital Sick Sinus Syndrome (SSS) is a disorder associated with sudden cardiac death due to severe bradycardia and prolonged pauses. Mutations in HCN4, the gene encoding inward Na+/K+ current (If), have been described as a cause of congenital SSS. The objective of this study is to develop an SSS model in embryonic zebrafish, and use zebrafish as a moderate-throughput assay to functionally characterize HCN4 variants. METHODS: To determine the function of hcn4 in zebrafish, embryos were either bathed in the If -specific blocker (ZD-7288), or endogenous hcn4 expression was knocked down using splice-blocking morpholinos...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28776540/value-of-combining-left-atrial-diameter-and-amino-terminal-pro-brain-natriuretic-peptide-to-the-cha2ds2-vasc-score-for-predicting-stroke-and-death-in-patients-with-sick-sinus-syndrome-after-pacemaker-implantation
#20
Bin-Feng Mo, Qiu-Fen Lu, Shang-Biao Lu, Yu-Quan Xie, Xiang-Fei Feng, Yi-Gang Li
BACKGROUND: The CHA2DS2-VASc score is used clinically for stroke risk stratification in patients with atrial fibrillation (AF). We sought to investigate whether the CHA2DS2-VASc score predicts stroke and death in Chinese patients with sick sinus syndrome (SSS) after pacemaker implantation and to evaluate whether the predictive power of the CHA2DS2-VASc score could be improved by combining it with left atrial diameter (LAD) and amino-terminal pro-brain natriuretic peptide (NT-proBNP). METHODS: A total of 481 consecutive patients with SSS who underwent pacemaker implantation from January 2004 to December 2014 in our department were included...
August 20, 2017: Chinese Medical Journal
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