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https://www.readbyqxmd.com/read/28429502/involvement-of-erk1-2-in-cx43-depression-induced-by-macrophage-migration-inhibitory-factor-in-atrial-myocytes
#1
Xin Li, Fang Rao, Chun-Yu Deng, Wei Wei, Fang-Zhou Liu, Hui Yang, Zhao-Yu Wang, Su-Juan Kuang, Xiao-Yan Chen, Yu-Mei Xue, Shu-Lin Wu
Connexin 43 (Cx43) plays an important role in the pathogenesis of atrial fibrillation (AF). The present study sought to investigate the effect of macrophage migration inhibitory factor (MIF), a pleiotropic cytokine, on Cx43 expression and activity and determine the intracellular signaling pathways. Cx43 protein and mRNA levels were assayed using immunofluorescence, real-time PCR, and western blot. We found that increased MIF and extracellular regulated protein kinases (ERK) expression was accompanied by a significant reduction in Cx43 protein expression in atrial tissues from patients with AF compared with those with sinus rhythm...
April 21, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28428444/impact-of-atrial-fibrillation-on-the-clinical-course-of-apical-hypertrophic-cardiomyopathy
#2
Sang-Eun Lee, Jin-Kyu Park, Jae-Sun Uhm, Jong Youn Kim, Hui-Nam Pak, Moon-Hyoung Lee, Boyoung Joung
BACKGROUND: Apical hypertrophic cardiomyopathy (ApHCM) is considered a 'benign' form of hypertrophic cardiomyopathy, with limited data on the long-term outcome. However, the clinical impact of atrial fibrillation (AF) in ApHCM is largely unknown. The hypothesis was that AF is common and has a prognostic implication in ApHCM. METHODS: The occurrence of AF and outcome was assessed in 306 consecutive patients with ApHCM (68% male, 62±11 years). RESULTS: AF occurred in 77 patients with ApHCM (prevalence, 25...
April 20, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28427903/atrial-fibrillation-is-associated-with-hypermethylation-in-human-left-atrium-and-treatment-with-decitabine-reduces-atrial-tachyarrhythmias-in-spontaneously-hypertensive-rats
#3
R Doñate Puertas, E Meugnier, C Romestaing, C Rey, E Morel, J Lachuer, N Gadot, A Scridon, C Julien, F Tronc, B Chapuis, C Valla, A Janin, L Pirola, A Méjat, S Rome, P Chevalier
Atrial fibrillation (AF) is the most common cardiac arrhythmia. As the molecular mechanisms underlying the pathology are largely unknown, this cardiac arrhythmia remains difficult to treat. To identify specific molecular actors involved in AF, we have performed a transcriptomic analysis on left atrium (LA) from patients with valvular heart disease with or without AF. We showed that 1627 genes had altered basal expression level in LA tissue of AF patients compared with the control group. The significantly enriched gene ontology biological process "anatomical structure morphogenesis" contained the highest number of genes in line with changes in structure that occur when the human heart remodels following AF development (ie, LA dilatation and interstitial fibrosis)...
March 30, 2017: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/28427851/circulating-ceruloplasmin-ceruloplasmin-associated-genes-and-the-incidence-of-atrial-fibrillation-in-the-atherosclerosis-risk-in-communities-study
#4
Antonio P Arenas de Larriva, Faye L Norby, Lin Y Chen, Elsayed Z Soliman, Ron C Hoogeveen, Dan E Arking, Laura R Loehr, Alvaro Alonso
BACKGROUND: Ceruloplasmin (CP) may promote structural changes in the atrium making it more arrhythmogenic. We assessed the associations between CP, CP-associated genetic variants, and incident atrial fibrillation (AF) in the Atherosclerosis Risk in Communities (ARIC) study. METHODS AND RESULTS: We studied 10,059 men and women without prevalent AF aged 53 to 75years in 1996-1998 and followed through 2012. Circulating CP was measured in stored blood samples obtained in 1996-1998...
April 6, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28427597/intentional-percutaneous-laceration-of%C3%A2-the%C3%A2-anterior-mitral-leaflet-to-prevent%C3%A2-outflow%C3%A2-obstruction-during-transcatheter-mitral-valve-replacement-first-in-human%C3%A2-experience
#5
Vasilis C Babaliaros, Adam B Greenbaum, Jaffar M Khan, Toby Rogers, Dee Dee Wang, Marvin H Eng, William W O'Neill, Gaetano Paone, Vinod H Thourani, Stamatios Lerakis, Dennis W Kim, Marcus Y Chen, Robert J Lederman
OBJECTIVES: This study sought to use a new catheter technique to split the anterior mitral valve leaflet (AML) and prevent iatrogenic left ventricular outflow tract (LVOT) obstruction immediately before transcatheter mitral valve replacement (TMVR). BACKGROUND: LVOT obstruction is a life-threatening complication of TMVR, caused by septal displacement of the AML. METHODS: The procedure was used in patients with severe mitral valve disease and prohibitive surgical risk...
April 24, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28427378/assessment-of-cardiac-function-in-children-with-congenital-adrenal-hyperplasia-a-case-control-study-in-cameroon
#6
J Tony Nengom, S Sap Ngo Um, D Chelo, R Mbono Betoko, J Boombhi, F Mouafo Tambo, A Chiabi, S Kingue, P Koki Ndombo
BACKGROUND: High level of androgens found in congenital adrenal hyperplasia (CAH) seems to have a deleterious effect on heart function. We therefore evaluate cardiac function of children with CAH in comparison with a healthy group. METHODS: We carried out a case-control study in the single endocrinology unit of the Mother and Child Center of Chantal Biya's Foundation. Cases were matched for age and genotypic sex to 2 healthy controls. We analyzed the ejection fraction (LVEF), fractional shortening and left ventricular mass; output and cardiac index; E and A waves velocities, E/A ratio and the mitral deceleration time and diameter of the left atrium; tricuspid annular plane systolic excursion and pulmonary artery systolic pressure were also measured...
April 20, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28425041/familial-amyloid-cardiomyopathy-masquerading-as-chronic-guillain-barre-syndrome-things-are-not-always-what-they-seem
#7
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/28424659/online-measurement-of-microembolic-signal-burden-by-transcranial-doppler-during-catheter-ablation-for-atrial-fibrillation-results-of-a-multicenter-trial
#8
Christian von Bary, Thomas Deneke, Thomas Arentz, Anja Schade, Heiko Lehrmann, Sabine Fredersdorf, Dobri Baldaranov, Lars Maier, Felix Schlachetzki
INTRODUCTION: Left atrial pulmonary vein isolation (PVI) is an accepted treatment option for patients with symptomatic atrial fibrillation (AF). This procedure can be complicated by stroke or silent cerebral embolism. Online measurement of microembolic signals (MESs) by transcranial Doppler (TCD) may be useful for characterizing thromboembolic burden during PVI. In this prospective multicenter trial, we investigated the burden, characteristics, and composition of MES during left atrial catheter ablation using a variety of catheter technologies...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28424358/ultrasound-assessment-of-umbilical-venous-catheter-migration-in-preterm-infants-a-prospective-study
#9
Jan Franta, Andrei Harabor, Amuchou S Soraisham
OBJECTIVES: To evaluate the umbilical venous catheter (UVC) tip position by ultrasound and compare it with standard radiograph findings and to examine the catheter tip migration rates during the first week of life. DESIGN: Prospective observational study of inborn preterm infants who had an UVC placed and its position radiographically confirmed. The first ultrasound was done on UVC placement at median (IQR) age of 2 hours (1-4) and follow-up scans at a median (IQR) age of 34 hours (27-44 hours), 77 hours (70-94 hours) and 6 days (5-7 days) after insertion...
May 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28423119/importance-of-serca2a-on-early-isolated-diastolic-dysfunction-induced-by-supravalvular-aortic-stenosis-in-rats
#10
C F S M P Silveira, D H S Campos, P P Freire, A F Deus, K Okoshi, C R Padovani, A C Cicogna
Cardiac remodeling is defined as changes in shape and function of the heart in response to aggression (pressure overload). The sarcoplasmic reticulum calcium ATPase cardiac isoform 2a (SERCA2a) is a known factor that influences function. A wide spectrum of studies report a decrease in SERCA2a in heart failure, but none evaluate it's the role in early isolated diastolic dysfunction in supravalvular aortic stenosis (AoS). Our hypothesis was that SERCA2a participates in such dysfunction. Thirty-day-old male Wistar rats (60-80 g) were divided into AoS and Sham groups, which were submitted to surgery with or without aorta clipping, respectively...
April 13, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28422827/a-case-of-a-resected-benign-myxoma-like-hemorrhagic-cyst-which-later-recurred-as-undifferentiated-pleomorphic-sarcoma-in-the-left-atrium
#11
Eunju Kim, Seo-Won Choi, Daniel Min, Sang Hoon Kim, Woo-In Yang, Jae Youn Moon, Jung Hoon Sung, In Jai Kim, Sang-Wook Lim, Dong-Hun Cha, Byung Moon, Sang-Ho Cho, Won-Jang Kim
RATIONALE: An intracardiac cystic mass is a rare type of mass found in the left atrium. The differential diagnosis of an intracardiac cystic mass includes hydatid cysts, bronchogenic cysts, intracardiac varices, and hemorrhages in some tumor types, including myxoma. PATIENT CONCERNS: We present the case of a 68-year-old woman who presented with episodic dyspnea. DIAGNOSES-INTERVENTIONS-OUTCOMES: Transthoracic echocardiography (TTE) revealed the presence of a left atrial mass mimicking myxoma...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28422654/novel-mri-technique-enables-non-invasive-measurement-of-atrial-wall-thickness
#12
Marta Varela, Ross Morgan, Adeline Theron, Desmond Dillon-Murphy, Henry Chubb, John Whitaker, Markus Henningsson, Paul Aljabar, Tobias Schaeffter, Christoph Kolbitsch, Oleg V Aslanidi
Knowledge of atrial wall thickness (AWT) has the potential to provide important information for patient stratification and the planning of interventions in atrial arrhythmias. To date, information about AWT has only been acquired in post-mortem or poor-contrast CT studies, providing limited coverage and highly variable estimates of AWT. We present a novel contrast agent-free MRI sequence for imaging AWT and use it to create personalized AWT maps and a biatrial atlas. A novel black-blood phase-sensitive inversion recovery protocol was used to image 10 volunteers and 2 atrial fibrillation patients, as proof of concept...
April 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28422349/effects-of-extrinsic-cardiac-nerve-stimulation-on-atrial-fibrillation-inducibility-the-regulatory-role-of-the-spinal-cord
#13
Zixuan Dai, Congxin Huang, Qingyan Zhao, Shujuan Zhang, Hongyi Zhao, Youjing Zhang, Yongsheng Qian, Yanhong Tang
OBJECTIVE: To investigate the effect of the mutual regulation of the extrinsic cardiac nerves on atrial electrophysiology and atrial fibrillation (AF) vulnerability. METHODS AND RESULTS: Fourteen dogs were randomly divided into 2 groups: spinal cord stimulation (SCS) group (n = 7) and spinal cord block (SCB) group (n = 7). SCS was performed with 90% of the threshold voltage stimulating the T1 -T2 spinal level, while SCB was performed by injecting 2% lidocaine into the epidural space at the T2-3 level...
April 19, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28420633/fibrin-sheath-associated-endovascular-infection-of-the-heart-the-trojan-horse-of-indwelling-central-venous-catheters
#14
Muhammad Adil Sheikh, Mohamed Shokr, Walid Ibrahim, Shaun Cardozo
Chronic indwelling central venous catheters can result in formation of fibrin sheaths increasing risk of occlusion, thrombosis and infection. Endovascular infection of right-sided heart structures induced by such sheaths is very rare. A 48-year-old woman with end-stage renal disease initially treated for diabetic ketoacidosis developed persistent Staphylococcus epidermidis bacteraemia without an identifiable source. Although transthoracic echocardiography was unremarkable, transoesophageal echocardiography revealed a fibrin sheath and vegetations in superior vena cava-right atrium junction, which was the site of the tip of a central catheter that had been removed 2 months prior, consistent with fibrin sheath-associated endovascular infection...
April 17, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28419224/avoiding-oesophageal-injury-during-cardiac-ablation-insights-gained-from-mediastinal-anatomy
#15
Devan Marar, Venkatraman Muthusamy, Subramaniam C Krishnan
Aims: This study investigates the lateral displacement of the oesophagus at the level of the left atrium (LA) in 11 cadavers. Methods and results: The study was conducted using human cadavers. An endotracheal stylet probe was inserted into the eosphagus. The pericardium overlying the posterior LA was fixed in place. The lateral movement of the oesophagus from side to side was recorded. The initial study method had the stylet probe extending to the gastroesophageal (GE) junction...
April 16, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28416973/the-utility-of-atrial-pacing-for-identifying-the-electrical-breakthrough-sites-between-the-left-atrium-and-pulmonary-veins
#16
Shinya Sugiura, Koji Matsuoka, Hideki Noda, Naoya Kurata, Misa Uemori, Hirokazu Shioji, Akihiro Takasaki, Takafumi Koji, Takashi Tanigawa, Masaaki Ito
BACKGROUND: Circumferential pulmonary vein (PV) isolation for atrial fibrillation (AF) is occasionally difficult to achieve because electrical breakthrough sites (EBSs) between the left atrium (LA) and PVs cannot be identified during ablation especially in the carina regions. METHODS: The left PVs (Lt.PVs) of 60 AF patients and the right PVs (Rt.PVs) of 37 patients undergoing PV isolation were studied. When PV isolation was not achieved after the initial circumferential PV isolation, atrial pacing was repeatedly performed from the distal coronary sinus (CSd) and high right atrium (HRA), and the time interval from the stimulus to the earliest PV potential (stimulus-PV interval) was measured using circular mapping catheters at each PV until PV isolation was achieved...
April 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28416972/crucial-role-of-pulmonary-vein-firing-as-an-initiator-of-typical-atrial-flutter-evidence-of-a-close-relationship-between-atrial-fibrillation-and-typical-atrial-flutter
#17
Takashi Kaneshiro, Kentaro Yoshida, Yukio Sekiguchi, Hiroshi Tada, Kenji Kuroki, Keisuke Kuga, Yoshiyuki Kamiyama, Hitoshi Suzuki, Yasuchika Takeishi, Kazutaka Aonuma
BACKGROUND: Several studies reported that cavotricuspid isthmus-dependent atrial flutter (typical AFL) frequently coexists with atrial fibrillation (AF); however, the underlying mechanisms have not been fully investigated. This study aimed to reveal the mechanisms of the initiation of typical AFL and the association between typical AFL and AF. METHODS: Among 154 consecutive patients undergoing a first catheter ablation of AF, we investigated the appearance and mechanism of spontaneous initiation of typical AFL during catheter ablation...
April 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28415129/p1294evaluation-of-right-atrium-mechanics-and-relation-with-loading-conditions-by-speckle-tracking-echocardiography
#18
S Unlu
Purpose: The aim of this study is to evaluate the right atrial (RA) mechanics and change in echocardiographic parameters used for assessment of RA by examining the end stage kidney patients before and after the hemodialysis (HD). Methods: Patients between 18 and 85 years of age, receiving HD for at least 6 months were included. The echocardiographic images were obtained before and after hemodialysis therapy. Two-dimensional speckle tracking strain analysis was performed for right atrium in 62 patients...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415121/p1113relationship-between-left-atrium-and-hypertensive-retinopathy-in-patients-with-systemic-hypertension-a-real-time-three-dimensional-echocardiography-based-study
#19
B Kanar, H S Kanar, A Karatay, M K Tigen
Background: The fundoscopic examination of hypertensive patients, which is an established hypertension-related target organ damage (TOD), tends to be underutilized in clinical practice. We sought to investigate the relationship between retinal alterations and left atrium (LA) volumes by means of real-time, three-dimensional echocardiography (RT3DE), which is the most pivotal predictor of diastolic dysfunction. Methods: Our population consisted of 88 consecutive essential hypertensive patients (age 59...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415098/p569diastolic-dyssynchrony-is-associated-with-exercise-intolerance-in-hypertensive-patients-with-left-ventricular-hypertrophy
#20
I H Jung, H S Seo, M J Kim
Background: Left ventricular hypertrophy (LVH) is associated with intra-ventricular dyssynchrony at systolic phase during exercise in hypertensive patients. However, dypsnea on exertion is much more correlated with diastolic phase. We investigated whether LVH is associated with diastolic dyssynchrony during exercise in patients with hypertension. Methods: Ninety hypertensive patients with exertional dyspnea and 30 control individuals were enrolled. Exercise stress echocardiography was performed using a symptom limited, multistage supine bicycle test...
December 1, 2016: European Heart Journal Cardiovascular Imaging
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