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Sick sinus syndrome

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https://www.readbyqxmd.com/read/28644224/sick-sinus-syndrome
#1
Lendell Richardson
No abstract text is available yet for this article.
July 2017: JAAPA: Official Journal of the American Academy of Physician Assistants
https://www.readbyqxmd.com/read/28557294/a-mechanism-for-nav-1-5-downregulation-and-sodium-current-decrease-in-heart-failure
#2
EDITORIAL
Sara Pagans, Marcel Vergés
The pore-forming α-subunit of the cardiac voltage-gated sodium channel, NaV 1.5, is responsible for the initial upstroke of the cardiac action potential. NaV 1.5 cell surface expression and function are modulated by its interaction with regulatory proteins and by posttranslational modifications, such as phosphorylation, arginine methylation or ubiquitination (1) . Genetic mutations in the SCN5A gene, which encodes NaV 1.5, have been associated with a variety of inherited cardiac arrhythmias, including long QT syndrome type 3, Brugada syndrome, atrial fibrillation, and congenital sick sinus syndrome...
May 30, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28554512/functional-atrial-undersensing-associated-with-device-algorithm-promoting-av-conduction
#3
Pasquale Crea, Angela Nicotera, Dalia Di Nunzio, Giuseppe Picciolo
A 58-year-old woman received a dual chamber pacemaker (Medtronic) for sick sinus syndrome. Given intact AV conduction the Managed Ventricular Pacing mode algorithm (MVP) was programmed. The day after, she suffered from palpitations. Her ECG showed a possible loss of atrial capture accompanied by atrial undersensing. Telemetry-supported pacemaker control confirmed the loss of capture. Undersensing of atrial signal was functional, related to long atrial refractory period in MVP mode algorithm. Device algorithms could induce false suspicions...
May 18, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28552416/case-of-pacemaker-pocket-infection-caused-by-finegoldia-magna
#4
Seyed Hamed Hosseini Dehkordi, Georgina Osorio
Finegoldia magna (formerly called Peptostreptococcus magnus) is a Gram-positive anaerobic coccus which is increasingly recognized as an opportunistic pathogen. We present a case of F. magna associated non-valvular cardiovascular device-related infection in an 83 year-old male who received a permanent pacemaker for sick sinus syndrome seven weeks prior to his presentation. Five weeks after the implantation, the pacemaker and leads were explanted because of clinical evidence of pacemaker pocket infection. He was initially treated with sulfamethoxazole-trimethoprim based on the Gram stain results from the removed pacemaker...
May 25, 2017: Anaerobe
https://www.readbyqxmd.com/read/28525326/short-term-heart-rate-variability-in-dogs-with-sick-sinus-syndrome-or-chronic-mitral-valve-disease-as-compared-to-healthy-controls
#5
Sz Bogucki, A Noszczyk-Nowak
Heart rate variability is an established risk factor for mortality in both healthy dogs and animals with heart failure. The aim of this study was to compare short-term heart rate variability (ST-HRV) parameters from 60-min electrocardiograms in dogs with sick sinus syndrome (SSS, n=20) or chronic mitral valve disease (CMVD, n=20) and healthy controls (n=50), and to verify the clinical application of ST-HRV analysis. The study groups differed significantly in terms of both time - and frequency- domain ST-HRV parameters...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28500798/persistent-sick-sinus-syndrome-in-scrub-typhus
#6
Lae-Young Jung, Ji-Young Yoon, Soo-Kyeong Song, Chang-Seop Lee
No abstract text is available yet for this article.
May 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28484651/surgical-repair-of-subacute-right-ventricular-perforation-after-pacemaker-implantation
#7
Takeshi Oda, Takanori Kono, Keiichi Akaiwa, Yasushi Takahara, Chie Yasuoka, Katsuhiko Nakamura
We report an 84-year-old woman who presented with right ventricular perforation 4 days after pacemaker implantation for syncope due to sick sinus syndrome. Median sternotomy revealed no pericardial effusion, but the pacing lead had penetrated the right ventricle and pericardium. When the pleura was opened, the tip of the lead was seen in the visceral pleura. The lead was cut in the pericardial cavity and extracted from the left subclavian wound together with the generator. The right ventricular perforation was sutured and a temporary pacing lead was placed on the right ventricular wall intraoperatively...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28471545/eleven-year-trends-of-inpatient-pacemaker-implantation-in-patients-diagnosed-with-sick-sinus-syndrome
#8
Avirup Guha, Xiao Xiang, Devin Haddad, Benjamin Buck, Xu Gao, Michael Dunleavy, Ellen Liu, Dilesh Patel, Vadim V Fedorov, Emile G Daoud
BACKGROUND: Pacemakers (PM) are used for managing sick sinus syndrome (SSS). This study evaluates predictors and trends of PM implantation for SSS. METHODS: Patients were identified from the National Inpatient Sample dataset (2003-13). Included patients were ≥18 years old, had a diagnosis of sinus node dysfunction and atrial arrhythmia (i.e., SSS). Patients who died, transferred out, who had prior device or had a defibrillator or resynchronization therapy device implanted were excluded...
May 4, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28465117/a-novel-splice-site-hcn4-gene-mutation-c-1737-1-g-t-causes-familial-bradycardia-reduced-heart-rate-response-impaired-chronotropic-competence-and-increased-short-term-heart-rate-variability
#9
Lidia Hategan, Beáta Csányi, Balázs Ördög, Kornél Kákonyi, Annamária Tringer, Orsolya Kiss, Andrea Orosz, László Sághy, István Nagy, Zoltán Hegedűs, László Rudas, Márta Széll, András Varró, Tamás Forster, Róbert Sepp
BACKGROUND: The most important molecular determinant of heart rate regulation in sino-atrial pacemaker cells includes hyperpolarization-activated, cyclic nucleotide-gated ion channels, the major isoform of which is encoded by the HCN4 gene. Mutations affecting the HCN4 gene are associated primarily with sick sinus syndrome. METHODS AND RESULTS: A novel c.1737+1 G>T 'splice-site' HCN4 mutation was identified in a large family with familial bradycardia which co-segregated with the disease providing a two-point LOD score of 4...
April 20, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28460803/an-unexpected-presentation-of-sick-sinus-syndrome-isolated-ventricular-asystole
#10
Harun Gunes, Feruza Turan Sonmez, Halit Berk Canga, Ayhan Saritas
Sick sinus syndrome is a disorder of sinus node function characterized by various dysrhythmias such as sinus bradycardia or pause, paroxysmal regular or irregular atrial tachycardia, tachycardiabradycardia attacks or atrial fibrillation with slow ventricular response. Ventricular asystole with preserved atrial electrical activity is a rarely seen presenting rhythm in the ED and an extremely rare cause of syncope. A 67-year-old male having a syncope attack was admitted to the emergency department. His Glasgow coma scale score was 15 on admission...
April 27, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28458273/long-term-effects-of-cilostazol-in-a-dog-with-sick-sinus-syndrome
#11
Nobuyuki Kanno, Tomohiro Suzuki
Sick sinus syndrome (SSS) is a type of bradyarrhythmia that can lead to syncope. Cilostazol has been reported to be an effective treatment for human patients with SSS and other bradyarrhythmias. This report describes the successful long-term treatment with cilostazol in a dog with SSS. A nine-year old intact male Miniature Schnauzer presented with a history of syncopal episodes and unsteady gait. After cilostazol treatment, the total heart rate (HR), mean HR, and frequency of premature ventricular contractions (PVCs) increased, while the maximum HR and maximum pause time decreased...
May 1, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28441822/-clinical-features-and-outcomes-of-radiofrequency-catheter-ablation-of-atrial-flutter-in-children
#12
H Jiang, X M Li, Y Zhang, H J Liu, M T Li, H Y Ge
Objective: To explore the clinical features of atrial flutter (AFL) and evaluate the efficacy of radiofrequency catheter ablation (RFCA) for AFL in children. Method: Data were collected and analyzed on 50 consecutive pediatric AFL patients (male 37/female 13) who underwent electrophysiology study and RFCA from February 2009 to November 2016 in a case observational study. The average age was (6.2±3.5) years and body weight was (23.7±13.5) kg. Heart structure was normal in 26 patients. Twenty-four patients had congenital heart disease (CHD) and among them 22 patients underwent repaired surgery before...
April 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28425041/familial-amyloid-cardiomyopathy-masquerading-as-chronic-guillain-barre-syndrome-things-are-not-always-what-they-seem
#13
Die Hu, Ling Liu, Shuguang Yuan, Yuhong Yi, Daoquan Peng
Familial amyloid cardiomyopathy is a challenging condition that mimics many other diseases, particularly in patients with pronounced neurological presentations and unexplained or equivocal cardiac abnormalities. In this case, a 57-year-old man was admitted for outpatient cardiological evaluation of progressive right heart failure and limb paraesthesias. The patient presented with hypertension, chronic Guillain-Barre syndrome, and sick sinus syndrome. Transthoracic echocardiograms showed a thickened ventricular wall and enlarged atrium...
April 19, 2017: Frontiers of Medicine
https://www.readbyqxmd.com/read/28414673/purulent-pericarditis-due-to-an-infected-pacemaker-lead
#14
Teresa Backes
INTRODUCTION: Intravenous drug users have a substantially increased risk of infective endocarditis, especially in the setting of implanted cardiac devices. Purulent pericarditis is a rare occurrence that can occur iatrogenically or through direct or hematogenous spread. CASE DESCRIPTION: A 75 year old man with a past medical history significant for hepatitis C, IV drug abuse, and sick sinus syndrome status post pacemaker was brought in by EMS with a chief complaint of diaphoresis and chest pain...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28391114/genotype-phenotype-dilemma-in-a-case-of-sudden-cardiac-death-with-the-e1053k-mutation-and-a-deletion-in-the-scn5a-gene
#15
T Jenewein, B M Beckmann, S Rose, H H Osterhues, U Schmidt, C Wolpert, P Miny, C Marschall, M Alders, C R Bezzina, A A M Wilde, S Kääb, S Kauferstein
Mutations in the cardiac sodium channel gene SCN5A may result in various arrhythmia syndromes such as long QT syndrome type 3 (LQTS), Brugada syndrome (BrS), sick sinus syndrome (SSS), cardiac conduction diseases (CCD) and possibly dilated cardiomyopathy (DCM). In most of these inherited cardiac arrhythmia syndromes the phenotypical expression may range from asymptomatic phenotypes to sudden cardiac death (SCD). A 16-year-old female died during sleep. Autopsy did not reveal any explanation for her death and a genetic analysis was performed...
March 20, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28382491/tbx18-dependent-differentiation-of-brown-adipose-tissue-derived-stem-cells-toward-cardiac-pacemaker-cells
#16
Lei Chen, Zi-Jun Deng, Jian-Sheng Zhou, Rui-Juan Ji, Xi Zhang, Chuan-Sen Zhang, Yu-Quan Li, Xiang-Qun Yang
A cell-sourced biological pacemaker is a promising therapeutic approach for sick sinus syndrome (SSS) or severe atrial ventricular block (AVB). Adipose tissue-derived stem cells (ATSCs), which are optimal candidate cells for possible use in regenerative therapy for acute or chronic myocardial injury, have the potential to differentiate into spontaneous beating cardiomyocytes. However, the pacemaker characteristics of the beating cells need to be confirmed, and little is known about the underlying differential mechanism...
April 5, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28382260/delayed-pacemaker-lead-perforations-why-unusual-presentations-should-prompt-an-early-multidisciplinary-team-approach
#17
John An Kuang Chao, Michael S Firstenberg
Our first case is an 84-year-old female diagnosed with sick sinus syndrome. She underwent implantation of dual chamber permanent pacemaker without complications. On the 8(th) day status-postimplantation, she returned to the emergency department (ED) with moderately severe left anterior chest pain and significant ecchymosis. She was given an initial diagnosis of shingles and discharged. Two days later, she returned to the ED with increasing chest pain, dyspnea, nausea, and vomiting. Lead migration and cardiac perforation was confirmed by chest X-ray and computed tomography (CT), respectively...
January 2017: International Journal of Critical Illness and Injury Science
https://www.readbyqxmd.com/read/28350118/tachycardia-bradycardia-syndrome-electrophysiological-mechanisms-and-future-therapeutic-approaches-review
#18
Gary Tse, Tong Liu, Ka Hou Christien Li, Victoria Laxton, Andy On-Tik Wong, Yin Wah Fiona Chan, Wendy Keung, Camie W Y Chan, Ronald A Li
Sick sinus syndrome (SSS) encompasses a group of disorders whereby the heart is unable to perform its pacemaker function, due to genetic and acquired causes. Tachycardia‑bradycardia syndrome (TBS) is a complication of SSS characterized by alternating tachycardia and bradycardia. Techniques such as genetic screening and molecular diagnostics together with the use of pre-clinical models have elucidated the electrophysiological mechanisms of this condition. Dysfunction of ion channels responsible for initiation or conduction of cardiac action potentials may underlie both bradycardia and tachycardia; bradycardia can also increase the risk of tachycardia, and vice versa...
February 6, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28345212/cardiac-iodine-123-metaiodobenzylguanidine-scintigraphy-may-be-useful-to-identify-pathologic-from-physiologic-sinus-bradycardia
#19
Akihiro Sunaga, Masaharu Masuda, Masashi Fujita, Osamu Iida, Takashi Kanda, Yasuhiro Matsuda, Takakazu Morozumi, Toshiaki Mano, Masaaki Uematsu
BACKGROUND: Sinus bradycardia includes pathologic sick sinus syndrome (SSS) and physiologic bradycardia such as athletes' heart. Pacemaker implantation is indicated for patients with symptomatic SSS; however, the indication remains difficult to determine in those with mild and/or unspecific symptoms. The sympathetic tone is increased in response to reduced cardiac output in SSS, whereas excessive vagal tone has been seen in physiological bradycardia. We sought to determine if cardiac iodine-123-metaiodobenzylguanidine scintigraphy ((123) I-MIBG) was useful in differentiating pathologic from physiologic sinus bradycardia...
March 27, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28303455/duodenal-cancer-in-a-young-patient-with-peuts-jeghers-syndrome-harboring-an-entire-deletion-of-the-stk11-gene
#20
Satoshi Teramae, Koichi Okamoto, Kumiko Tanaka, Reika Matsumoto, Shinji Kitamura, Tetsuo Kimura, Masahiro Sogabe, Hiroshi Miyamoto, Naoki Muguruma, Yoshimi Bando, Mitsuo Shimada, Tetsuji Takayama
A 21-year-old woman with Peuts-Jeghers syndrome (PJS) was referred to our hospital for gastrointestinal surveillance. She had been diagnosed as having PJS from a young age based on her family history and the presence of mucocutaneous pigmentation on her lips and oral mucosa. Her mother and brother had PJS harboring an entire deletion of the STK11 gene. She had tetralogy of Fallot, atrial tachycardia, sick sinus syndrome, and mental retardation in her past history. Esophagogastroduodenoscopy identified a protruded lesion with a depressed area that occupied the lumen half-circumferentially in the duodenal second portion and also showed a 10-mm protruded lesion on the anterior wall of the lower gastric body...
June 2017: Clinical Journal of Gastroenterology
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