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https://www.readbyqxmd.com/read/28747516/redundant-and-diverse-intranodal-pacemakers-and-conduction-pathways-protect-the-human-sinoatrial-node-from-failure
#1
Ning Li, Brian J Hansen, Thomas A Csepe, Jichao Zhao, Anthony J Ignozzi, Lidiya V Sul, Stanislav O Zakharkin, Anuradha Kalyanasundaram, Jonathan P Davis, Brandon J Biesiadecki, Ahmet Kilic, Paul M L Janssen, Peter J Mohler, Raul Weiss, John D Hummel, Vadim V Fedorov
The human sinoatrial node (SAN) efficiently maintains heart rhythm even under adverse conditions. However, the specific mechanisms involved in the human SAN's ability to prevent rhythm failure, also referred to as its robustness, are unknown. Challenges exist because the three-dimensional (3D) intramural structure of the human SAN differs from well-studied animal models, and clinical electrode recordings are limited to only surface atrial activation. Hence, to innovate the translational study of human SAN structural and functional robustness, we integrated intramural optical mapping, 3D histology reconstruction, and molecular mapping of the ex vivo human heart...
July 26, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28747025/platelet-function-and-microparticle-levels-in-atrial-fibrillation-changes-during-the-acute-episode
#2
Line Pourtau, Jean Marc Sellal, Romaric Lacroix, Philippe Poncelet, Olivier Bernus, Gisèle Clofent-Sanchez, Mélèze Hocini, Michel Haïssaguerre, Françoise Dignat-George, Frédéric Sacher, Paquita Nurden
BACKGROUND: Thrombotic risk constitutes a major complication of atrial fibrillation (AF). Platelets and microparticles (MPs) are important for hemostasis and thrombosis, however their participation during AF is not well known. The aim of this study was to characterize platelet function and MPs procoagulant and fibrinolytic activity in AF patients and to determine the effects of an acute-AF episode. METHODS: Blood was collected from paroxysmal (21) and persistent (16) AF patients referred for AF catheter ablation...
September 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28746816/expression-of-classical-mediators-in-hearts-of-rats-with-hepatic-dysfunction
#3
Dagmar Jarkovska, Monika Bludovska, Eliska Mistrova, Vera Krizkova, Dana Kotyzova, Tereza Kubikova, Jana Slavikova, Sumeyye Nur Erek, Aleksandar Djordjevic, Magdalena Chottova Dvorakova
Liver cirrhosis is associated with impairment of cardiovascular function including alterations of the heart innervation, humoral and nervous dysregulation, changes in systemic circulation and electrophysiological abnormalities. Choline acetyltransferase (ChAT), enzyme forming acetylcholine, tyrosine hydroxylase (TH) and dopamine-β-hydroxylase (DBH), enzymes participating in noradrenaline synthesis, are responsible for the production of classical neurotransmitters and atrial natriuretic peptide (ANP) is produced by cardiomyocytes...
July 26, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28745025/nonalcoholic-steatohepatitis-is-associated-with-cardiac-remodeling-and-dysfunction
#4
Tracey G Simon, Daniel G Bamira, Raymond T Chung, Rory B Weiner, Kathleen E Corey
OBJECTIVE: Preliminary data suggest that nonalcoholic fatty liver disease is associated with early heart failure (HF). However, whether nonalcoholic steatohepatitis (NASH) is directly associated with echocardiographic changes in cardiac structure or function remains unknown. METHODS: A retrospective cohort was identified of individuals (N = 65) without known heart disease, undergoing elective bariatric surgery with perioperative liver biopsy, and available recent transthoracic echocardiography (TTE)...
August 2017: Obesity
https://www.readbyqxmd.com/read/28743481/prevalence-and-prognostic-relevance-of-atrial-fibrillation-in-patients-with-takotsubo-syndrome
#5
Thomas Stiermaier, Francesco Santoro, Charlotte Eitel, Tobias Graf, Christian Möller, Nicola Tarantino, Francesca Guastafierro, Matteo Di Biase, Holger Thiele, Natale D Brunetti, Ingo Eitel
BACKGROUND: Takotsubo syndrome (TTS) is associated with a considerable risk of complications during the acute phase and substantial long-term mortality rates. Concomitant atrial fibrillation may have an impact on outcome in these patients. Aim of this study was to assess the prevalence and prognostic relevance of atrial fibrillation in TTS. METHODS: We performed an international, multicenter study including 387 TTS patients consecutively enrolled at 3 centers. Atrial fibrillation was defined as known history before admission or documented episodes during hospital stay...
July 18, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28740583/hyperthyroidism-and-the-heart
#6
Patricia Mejia Osuna, Maja Udovcic, Morali D Sharma
Thyroid hormones have a significant impact on cardiac function and structure. Excess thyroid hormone affects cardiovascular hemodynamics, leading to high-output heart failure and, in late stages, dilated cardiomyopathy. In this review, we discuss how hyperthyroidism affects cardiovascular pathophysiology and molecular mechanisms and examine the complications caused by excess thyroid hormone, such as heart failure and atrial fibrillation.
April 2017: Methodist DeBakey Cardiovascular Journal
https://www.readbyqxmd.com/read/28740203/homeostatic-left-heart-integration-and-disintegration-links-atrio-ventricular-covariation-s-dyshomeostasis-in-hypertrophic-cardiomyopathy
#7
Paolo Piras, Concetta Torromeo, Antonietta Evangelista, Stefano Gabriele, Giuseppe Esposito, Paola Nardinocchi, Luciano Teresi, Andrea Madeo, Michele Schiariti, Valerio Varano, Paolo Emilio Puddu
Left ventricle and left atrium are and have been practically always analyzed separately in common clinically and non-clinically oriented cardiovascular investigations. Both classic and speckle tracking echocardiographic data contributed to the knowledge about deformational impairments occurring in systo-diastolic differences. Recently new trajectory based approaches allowed a greater awareness about the entire left ventricle or left atrium revolution and on their deficiencies that take place in presence of hypertrophic cardiomyopathy...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28739270/discrepancies-between-the-use-of-mdrd-4-idms-and-ckd-epi-equations-instead-of-the-cockcroft-gault-equation-in-the-determination-of-the-dosage-of-direct-oral-anticoagulants-in-patients-with-non-valvular-atrial-fibrillation
#8
Alejandro Isidoro Pérez Cabeza, Pedro Antonio Chinchurreta Capote, Jose Antonio González Correa, Francisco Ruiz Mateas, Gabriel Rosas Cervantes, Francisco Rivas Ruiz, Almudena Valle Alberca, Rafael Bravo Marqués
BACKGROUND AND OBJECTIVE: Direct oral anticoagulants (DOACs) require dose adjustment according to estimated clearance creatinine (eClCr) using the Cockcroft-Gault (CG) equation. There are discrepancies with the equations that estimate glomerular filtration rate (eGFR). We analyse how the use of the CKD-EPI and MDRD-4 IDMS equations affect the recommended dosage for ACODs. PATIENTS AND METHODS: Retrospective study of patients with non-valvular atrial fibrillation seen at a cardiology clinic between November 2012 and August 2014...
July 21, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28739186/epicardial-fat-thickness-correlates-with-p-wave-duration-left-atrial-size-and-decreased-left-ventricular-systolic-function-in-morbid-obesity
#9
A Fernandes-Cardoso, M Santos-Furtado, J Grindler, L A Ferreira, J L Andrade, M A Santo
BACKGROUND AND AIM: Epicardial fat (EF) is increased in obesity and has important interactions with atrial and ventricular myocardium. Most of the evidence in this scenario can be confused by the presence of comorbidities such as hypertension, diabetes and dyslipidemia, which are very common in this population. The influence of EF on atrial remodeling and cardiac function demands further investigation on morbidly obese without these comorbidities. METHODS AND RESULTS: We prospectively recruited 20 metabolically healthy morbidly obese and 20 normo-weights controls...
June 1, 2017: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
https://www.readbyqxmd.com/read/28739034/evaluation-of-resting-cardiac-power-output-as-a-prognostic-factor-in-patients-with-advanced-heart-failure
#10
Omer Yildiz, Gamze Aslan, Zumrut T Demirozu, Cemal Deniz Yenigun, Nuran Yazicioglu
If the heart is represented by a hydraulic pump, cardiac power represents the hydraulic function of the heart. Cardiac pump function is frequently determined through left ventricular ejection fraction using imaging. This study aims to validate resting cardiac power output (CPO) as a predictive biomarker in patients with advanced heart failure (HF). One hundred and seventy-two patients with HF severe enough to warrant cardiac transplantation were retrospectively reviewed at a single tertiary care institution between September 2010 and July 2013...
June 28, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28738160/atrial-selective-k-channel-blockers-potential-antiarrhythmic-drugs-in-atrial-fibrillation
#11
Ursula Ravens
In the wake of demographic change in Western countries atrial fibrillation has reached an epidemiological scale, yet current strategies for drug treatment of the arrhythmia lack sufficient efficacy and safety. In search of novel medications, atrial-selective drugs that specifically target atrial over other cardiac functions have been developed. In this lecture, I will address drugs acting on potassium (K+) channels that are either predominantly expressed in atria or possess electrophysiological properties distinct in atria from ventricles...
July 24, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28737016/grade-i-diastolic-dysfunction-and-elevated-left-ventricular-end-diastolic-pressure-mitral-doppler-inflow-pulmonary-vein%C3%A2-atrial-reversal-and-the-m-mode-mitral-b-bump
#12
Edmund K Kerut, Elizabeth McIlwain, Rick A Nishimura
Grade I diastolic dysfunction (DD) is generally associated with a normal mean left atrial pressure (LAP) and normal left ventricular end-diastolic pressure (LVEDP). The first hemodynamic alteration seen in DD, however, is the development of an elevated LVEDP with a persistent normal LAP. This is manifested by echocardiography as a continued mitral pulsed wave (PW) E/A <0.8 (Grade I DD), but with evidence of an elevated LVEDP. Such findings include alterations in PV flow, mitral PW inflow response to Valsalva maneuver, and also the presence of a B-bump on the mitral M-mode tracing...
July 23, 2017: Echocardiography
https://www.readbyqxmd.com/read/28736714/correlation-between-functional-electrical-gaps-identified-by-ultrahigh-density-mapping-and-by-late-gadolinium-enhancement-cardiac-magnetic-resonance-in-repeat-atrial-fibrillation-procedure
#13
Eva M Benito, David Andreu, Lluis Mont, Antonio Berruezo
No abstract text is available yet for this article.
May 2017: HeartRhythm Case Reports
https://www.readbyqxmd.com/read/28736561/recent-advances-in-stroke-prevention-in-patients-with-atrial-fibrillation-and-end-stage-renal-disease
#14
REVIEW
Federico Ronco, Patrizio Mazzone, Leila Hosseinian, Simonetta Genovesi
BACKGROUND: Chronic kidney disease (CKD) is associated with a high prevalence of atrial fibrillation (AF), but in this population the risk/benefit ratio of anticoagulant therapy with vitamin K antagonists (VKA) for thromboprophylaxis is uncertain. SUMMARY: In end-stage renal disease (ESRD) patients undergoing hemodialysis, VKA seem less effective in stroke prevention than in the general population, with an increased risk of major bleeding. Recently, novel oral anticoagulant agents (NOACs) have proven to be effective for stroke prevention in AF and have demonstrated an improved safety profile compared to VKA...
June 2017: Cardiorenal Medicine
https://www.readbyqxmd.com/read/28736560/nonparallel-progression-of-left-ventricular-structure-and-function-in-long-term-peritoneal-dialysis-patients
#15
Qiuhong Shi, Jing Zhu, Sheng Feng, Huaying Shen, Jianchang Chen, Kai Song
BACKGROUND/AIMS: Left ventricular hypertrophy and dysfunction are key cardiovascular risk factors of patients on peritoneal dialysis (PD). The purpose of this study was to investigate the dynamic changes of left ventricular (LV) structure and function in patients on long-term PD. METHODS: Patients who underwent PD catheter insertions from January 2010 to December 2012 in our PD center were enrolled into this study. Cardiac structure and function of those patients were determined by echocardiography (4 times) at 12-month intervals...
June 2017: Cardiorenal Medicine
https://www.readbyqxmd.com/read/28736385/thromboembolic-risk-bleeding-outcomes-and-effect-of-different-antithrombotic-strategies-in-very-elderly-patients-with-atrial-fibrillation-a-sub-analysis-from-the-prefer-in-af-prevention-of-thromboembolic-events-european-registry-in-atrial-fibrillation
#16
Giuseppe Patti, Markus Lucerna, Ladislav Pecen, Jolanta M Siller-Matula, Ilaria Cavallari, Paulus Kirchhof, Raffaele De Caterina
BACKGROUND: Increasing age predisposes to both thromboembolic and bleeding events in patients with atrial fibrillation; therefore, balancing risks and benefits of antithrombotic strategies in older populations is crucial. We investigated 1-year outcome with different antithrombotic approaches in very elderly atrial fibrillation patients (age ≥85 years) compared with younger patients. METHODS AND RESULTS: We accessed individual patients' data from the prospective PREFER in AF (PREvention oF thromboembolic events-European Registry in Atrial Fibrillation), compared outcomes with and without oral anticoagulation (OAC), and estimated weighed net clinical benefit in different age groups...
July 23, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28735892/clinical-and-echocardiographic-correlates-of-left-atrial-function-index-the-framingham-offspring-study
#17
Mayank Sardana, Gregory Nah, Connie W Tsao, Adedotun A Ogunsua, Eric Vittinghoff, Randell C Thomas, Susan Cheng, Aditya Vaze, Jayashri R Aragam, Gary F Mitchell, Emelia J Benjamin, Ramachandran S Vasan, Gerard P Aurigemma, Nelson B Schiller, David D McManus, Nisha I Parikh
BACKGROUND: Left atrial (LA) remodeling is a predictor of cardiovascular disease (CVD). We performed measurement of the LA function index (LAFI), a composite measure of LA structure and function, in a community-based cohort and here report the distribution and cross-sectional correlates of LAFI. METHODS: In 1,719 Framingham Offspring Study participants (54% women, mean age 66 ± 9 years), we derived LAFI from the LA emptying fraction, left ventricular (LV) outflow tract velocity time integral, and indexed maximal LA volume...
July 20, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28734926/derivation-and-evaluation-of-age-specific-multivariate-reference-regions-to-aid-in-identification-of-abnormal-filling-patterns-the-hunt-and-vamis-studies
#18
Jonas Selmeryd, Egil Henriksen, Håvard Dalen, Pär Hedberg
OBJECTIVES: This study aimed to derive age-specific multivariate reference regions (MVRs) able to classify subjects into those having normal or abnormal filling patterns and to evaluate the prognostic impact of this classification. BACKGROUND: The integration of several parameters is necessary to diagnose disorders of left ventricular (LV) filling because no single measurement accurately describes the complexity of diastolic function. However, no generally accepted validated multiparametric algorithm currently exists...
July 13, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28734595/arrhythmias-after-left-ventricular-assist-device-implantation-incidence-and-management
#19
REVIEW
Anis J Kadado, Joseph G Akar, James P Hummel
The use of mechanical circulatory support has become an increasingly common practice in patients with heart failure, whether used as bridge to transplantation or as destination therapy. The last couple of decades has seen a drastic change in the functioning of the left ventricular assist devices (LVAD), changing from the first generation devices running on pulsatile flow to the current continuous flow devices. Atrial and ventricular arrhythmias are common among heart failure patients, and though the systematic circulation is well supported in patients on mechanical circulatory support, these arrhythmias can still be the cause of detrimental symptoms and lead to potentially fatal outcomes...
July 10, 2017: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28734575/outcomes-associated-to-serum-phosphate-levels-in-patients-with-suspected-acute-coronary-syndrome
#20
Hong Xu, Marie Evans, Alessandro Gasparini, Karolina Szummer, Jonas Spaak, Johan Ärnlöv, Bengt Lindholm, Tomas Jernberg, Juan Jesús Carrero
BACKGROUND: We investigated the association between phosphate and the risk of adverse clinical outcomes in patients with manifest cardiovascular disease (CVD). METHODS: Observational study of patients hospitalized during 2006-2011 in Stockholm, Sweden, because of suspected acute coronary syndrome (ACS). The exposure was serum phosphate during the hospitalization. We modeled the association between phosphate and in-hospital death or in-hospital events (composite of myocardial infarction, cardiogenic shock, resuscitated cardiac arrest, atrial fibrillation, or atrioventricular block) as well as the one-year post-discharge risk of death or cardiovascular event (composite of myocardial re-infarction, heart failure and stroke)...
July 17, 2017: International Journal of Cardiology
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