keyword
MENU ▼
Read by QxMD icon Read
search

Bi ventricular pacing

keyword
https://www.readbyqxmd.com/read/27255170/triple-site-pacing-for-cardiac-resynchronization-in-permanent-atrial-fibrillation-acute-phase-results-from-a-prospective-observational-study
#1
Pedro Marques, Miguel Nobre Menezes, Gustavo Lima da Silva, Ana Bernardes, Andreia Magalhães, Nuno Cortez-Dias, Luís Carpinteiro, João de Sousa, Fausto J Pinto
INTRODUCTION AND AIM: Multi-site pacing is emerging as a new method for improving response to cardiac resynchronization therapy (CRT), but has been little studied, especially in patients with atrial fibrillation. We aimed to assess the effects of triple-site (Tri-V) vs. biventricular (Bi-V) pacing on hemodynamics and QRS duration. METHODS: This was a prospective observational study of patients with permanent atrial fibrillation and ejection fraction <40% undergoing CRT implantation (n=40)...
June 2016: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/26771573/left-atrial-size-and-function-in-a-canine-model-of-chronic-atrial-fibrillation-and-heart-failure
#2
Adam Goldberg, Kenya Kusunose, Salima Qamruddin, L Leonardo Rodriguez, Todor N Mazgalev, Brian P Griffin, David R Van Wagoner, Youhua Zhang, Zoran B Popović
BACKGROUND: Our aim was to assess how atrial fibrillation (AF) induction, chronicity, and RR interval irregularity affect left atrial (LA) function and size in the setting of underlying heart failure (HF), and to determine whether AF effects can be mitigated by vagal nerve stimulation (VNS). METHODS: HF was induced by 4-weeks of rapid ventricular pacing in 24 dogs. Subsequently, AF was induced and maintained by atrial pacing at 600 bpm. Dogs were randomized into control (n = 9) and VNS (n = 15) groups...
2016: PloS One
https://www.readbyqxmd.com/read/26748729/generating-purkinje-networks-in-the-human-heart
#3
Francisco Sahli Costabal, Daniel E Hurtado, Ellen Kuhl
The Purkinje network is an integral part of the excitation system in the human heart. Yet, to date, there is no in vivo imaging technique to accurately reconstruct its geometry and structure. Computational modeling of the Purkinje network is increasingly recognized as an alternative strategy to visualize, simulate, and understand the role of the Purkinje system. However, most computational models either have to be generated manually, or fail to smoothly cover the irregular surfaces inside the left and right ventricles...
August 16, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/26736775/multi-modal-data-fusion-for-cardiac-resynchronization-therapy-planning-and-assistance
#4
Sophie Bruge, Antoine Simon, Mathieu Lederlin, Julian Betancur, Alfredo Hernandez, Erwan Donal, Christophe Leclercq, Mireille Garreau
Cardiac Resynchronization Therapy (CRT) has been validated as an efficient treatment for selected patients suffering from heart failure with cardiac dyssynchrony. In case of bi-ventricular stimulation, the response to the therapy may be improved by an optimal choice of the left ventricle (LV) pacing sites. The characterization of LV properties to select the best candidate sites and to precise their access modes would be useful for the clinician in pre- and per-operative stages. For that purpose, we propose a new pre-operative analysis solution integrating previously developed multi-modal data registration methods and a new segmentation process of their coronary venous access...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26402340/flecainide-attenuates-rate-adaptation-of-ventricular-repolarization-in-guinea-pig-heart
#5
Oleg E Osadchii
OBJECTIVES: Flecainide is class Ic antiarrhythmic agent that was found to increase the risk of sudden cardiac death. Arrhythmic responses to flecainide could be precipitated by exercise, suggesting a role played by inappropriate rate adaptation of ventricular repolarization. This study therefore examined flecainide effect on adaptation of the QT interval and ventricular action potential duration (APD) to abrupt reductions of the cardiac cycle length. DESIGN: ECG and ventricular epicardial and endocardial monophasic APD were recorded in isolated, perfused guinea-pig heart preparations upon a sustained cardiac acceleration (rapid pacing for 30 s), and following a single perturbation of the cycle length evoked by extrasystolic stimulation...
2016: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/26082366/-role-of-cyclic-adenosine-monophosphate-response-element-binding-protein-in-ventricular-pacing-induced-cardiac-electrical-remodeling-in-a-canine-model
#6
Xuesi Chen, Xingxing Chen, Junhua Cheng, Jun Hong, Cheng Zheng, Jinglin Zhao, Jin Li, Jiafeng Lin
OBJECTIVE: This project is designed to explore the potential role of cyclic adenosine monophosphate (cAMP) response element binding protein (CREB) in cardiac electrical remodeling induced by pacing at different ventricular positions in dogs. METHODS: An animal model by implanting the pacemakers in beagles was established. According to the different pacing positions, the animals were divided into 4 groups:conditional control group (n=6), left ventricle pacing group (n=6), right ventricle pacing group (n=6) and bi-ventricle pacing group (n=6)...
April 2015: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/25964205/regenerative-therapy-prevents-heart-failure-progression-in-dyssynchronous-nonischemic-narrow-qrs-cardiomyopathy
#7
Satsuki Yamada, D Kent Arrell, Almudena Martinez-Fernandez, Atta Behfar, Garvan C Kane, Carmen M Perez-Terzic, Ruben J Crespo-Diaz, Robert J McDonald, Saranya P Wyles, Jelena Zlatkovic-Lindor, Timothy J Nelson, Andre Terzic
BACKGROUND: Cardiac resynchronization therapy using bi-ventricular pacing is proven effective in the management of heart failure (HF) with a wide QRS-complex. In the absence of QRS prolongation, however, device-based resynchronization is reported unsuitable. As an alternative, the present study tests a regenerative cell-based approach in the setting of narrow QRS-complex HF. METHODS AND RESULTS: Progressive cardiac dyssynchrony was provoked in a chronic transgenic model of stress-triggered dilated cardiomyopathy...
May 11, 2015: Journal of the American Heart Association
https://www.readbyqxmd.com/read/25529139/cardiac-fluid-dynamics-anticipates-heart-adaptation
#8
Gianni Pedrizzetti, Alfonso R Martiniello, Valter Bianchi, Antonio D'Onofrio, Pio Caso, Giovanni Tonti
Hemodynamic forces represent an epigenetic factor during heart development and are supposed to influence the pathology of the grown heart. Cardiac blood motion is characterized by a vortical dynamics, and it is common belief that the cardiac vortex has a role in disease progressions or regression. Here we provide a preliminary demonstration about the relevance of maladaptive intra-cardiac vortex dynamics in the geometrical adaptation of the dysfunctional heart. We employed an in vivo model of patients who present a stable normal heart function in virtue of the cardiac resynchronization therapy (CRT, bi-ventricular pace-maker) and who are expected to develop left ventricle remodeling if pace-maker was switched off...
January 21, 2015: Journal of Biomechanics
https://www.readbyqxmd.com/read/25484105/long-term-atrial-and-ventricular-epicardial-pacemaker-lead-survival-after-cardiac-operations-in-pediatric-patients-with-congenital-heart-disease
#9
Kelvin C Lau, J William Gaynor, Stephanie M Fuller, Karen A Smoots, Maully J Shah
BACKGROUND: Multiple cardiac operations and resultant myocardial scarring have been implicated in the overall reduced performance of epicardial pacing systems in patients with congenital heart disease (CHD). OBJECTIVE: The aim of the study is to evaluate long-term permanent epicardial pacing lead survival in patients with CHD who had epicardial lead placement in association with surgical repair or palliation. METHODS: A retrospective review of patients who had implantation of epicardial pacing systems between January 1984 and June 2010 was conducted...
March 2015: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/25469632/the-myocardial-ischemia-evaluated-by-real-time-contrast-echocardiography-may-predict-the-response-to-cardiac-resynchronization-therapy-a-large-animal-study
#10
Yongle Chen, Leilei Cheng, Haohua Yao, Haiyan Chen, Yongshi Wang, Weipeng Zhao, Cuizhen Pan, Xianhong Shu
Evidence-based criteria for applying cardiac resynchronization therapy (CRT) in patients with ischemic cardiomyopathy are still scarce. The aim of the present study was to evaluate the predictive value of real-time myocardial contrast echocardiography (RT-MCE) in a preclinical canine model of ischemic cardiomyopathy who received CRT. Ischemic cardiomyopathy was produced by ligating the first diagonal branch in 20 beagles. Dogs were subsequently divided into two groups that were either treated with bi-ventricular pacing (CRT group) or left untreated (control group)...
2014: PloS One
https://www.readbyqxmd.com/read/25157926/extracorporeal-acute-cardiac-pacing-by-high-intensity-focused-ultrasound
#11
Amit Livneh, Eitan Kimmel, Andrew R Kohut, Dan Adam
Ultrasound has been shown to produce Premature Ventricular Contractions (PVC's). Two clinical applications in which acute cardiac pacing by ultrasound may be valuable are: (1) preoperative patient screening in cardiac resynchronization therapy surgery; (2) Emergency life support, following an event of sudden death, caused by cardiac arrest. Yet, previously the demonstrated mean success rate of extra-systole induction by High Intensity Focused Ultrasound (HIFU) in rats is below 4.5% (Miller et al., 2011). This stands in contrast to previous work in rats using ultrasound (US) and ultrasound contrast agents (UCAs), where success rates of close to 100% were reported (Rota et al...
August 2014: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/25091614/-right-ventricular-septal-stimulation-would-produce-similar-bi-ventricular-dyssynchrony-as-does-apical-stimulation-in-patients-with-normal-ejection-fraction
#12
RANDOMIZED CONTROLLED TRIAL
Juan Manuel Lange, Hector Manzolillo, Jorge Parras, Domingo Pozzer, Ignacio Reyes, Rolando Pantich
OBJECTIVE: To determine in patients with normal ejection fraction, undergoing permanent VVI pacing, if medial septal stimulation has lower dyssynchrony than apical stimulation assessed by echocardiography. METHOD: A prospective trial, 19 patients>70 years old, scheduled for VVI pacemaker implantation for complete degenerative atrioventricular block, ventricular frequency<50beat per minute and ejection fraction≥45%. Patients with atrial fibrillation, heart failure, left bundle branch block and QRS durations longer than 120milliseconds in surface electrocardiogram with sinus rhythm were excluded...
July 2014: Archivos de Cardiología de México
https://www.readbyqxmd.com/read/24996250/electrocardiographic-predictors-of-sudden-and-non-sudden-cardiac-death-in-patients-with-ischemic-cardiomyopathy
#13
Salah S Al-Zaiti, James A Fallavollita, John M Canty, Mary G Carey
OBJECTIVE: This study evaluated the prognostic value of electrocardiogram (ECG)-based predictors in the primary prevention of sudden cardiac arrest (SCA) among ischemic cardiomyopathy patients with depressed left ventricular ejection fraction (LVEF ≤35%). BACKGROUND: The prediction of cause-specific mortality in high-risk patients offers the potential for targeting specific therapies (i.e., implantable cardioverter-defibrillator [ICD]). METHODS: Subjects were recruited from the Prediction of Arrhythmic Events with Positron Emission Tomography (PAREPET) study...
November 2014: Heart & Lung: the Journal of Critical Care
https://www.readbyqxmd.com/read/24981870/admittance-to-detect-alterations-in-left-ventricular-stroke-volume
#14
Erik R Larson, John E Porterfield, Sandeep Sagar, Juan Marmol-Velez, Manoj Panday, Daniel Escobedo, Joel Michalek, Yongjian Ouyang, Jonathan W Valvano, John A Pearce, Marc D Feldman
BACKGROUND: Implantable cardioverter-defibrillators monitor intracardiac electrograms (EGMs) to discriminate between ventricular and supraventricular tachycardias. The incidence of inappropriate shocks remains high because of misclassification of the tachycardia in an otherwise hemodynamically stable individual. Coupling EGMs with an assessment of left ventricular (LV) stroke volume (SV) could help in gauging hemodynamics during an arrhythmia and reducing inappropriate shocks. OBJECTIVE: The purpose of this study was to use the admittance method to accurately derive LV SV...
November 2014: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/24687965/left-and-right-ventricular-lead-positions-are-imprecisely-determined-by-fluoroscopy-in-cardiac-resynchronization-therapy-a-comparison-with-cardiac-computed-tomography
#15
RANDOMIZED CONTROLLED TRIAL
Anders Sommer, Mads Brix Kronborg, Bjarne Linde Nørgaard, Christian Gerdes, Peter Thomas Mortensen, Jens Cosedis Nielsen
AIMS: Fluoroscopy is the routine method for localizing left ventricular (LV) and right ventricular (RV) lead positions in cardiac resynchronization therapy (CRT). However, the ability of fluoroscopy to determine lead positions in a standard ventricular segmentation is unknown. We aimed to evaluate the accuracy and reproducibility of fluoroscopy to determine LV and RV lead positions in CRT when compared with cardiac computed tomography (CT). METHODS AND RESULTS: Fifty-nine patients undergoing CRT were included...
September 2014: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/24372196/rv-only-pacing-can-produce-a-q-wave-in-lead-1-and-an-r-wave-in-v1-implications-for-biventricular-pacing
#16
Joshua M Cooper, Rutuke K Patel, Anthony Emmi, Yan Wang, James N Kirkpatrick
BACKGROUND: Biventricular (bi-v) pacing improves congestive heart failure and mortality in patients with left ventricular (LV) dysfunction and electrical dyssynchrony. Effective resynchronization must include an LV pacing contribution to the QRS. Leads 1 and V1 are often exclusively used to verify proper biventricular pacing. METHODS: In 40 patients referred to our cardiac resynchronization therapy (CRT) optimization clinic, 12-lead electrocardiograms (ECGs) were obtained during bi-v pacing, right ventricular (RV)-only pacing, LV-only pacing, and a range of atrio-ventricular and ventriculo-ventricular intervals...
May 2014: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/24293177/evaluation-of-the-safety-and-effectiveness-of-the-cryomedix-cryoablation-catheter-system-for-the-treatment-of-atrial-flutter-and-fibrillation
#17
Gregory K Feld, Biguang Yao
BACKGROUND: Catheter ablation of atrial flutter and fibrillation (AFL and AF) has typically been performed with radiofrequency energy. Cryoablation has recently been used for AF and AFL, but its success has been limited by the nadir temperature achievable using nitrous oxide as a refrigerant. In this study, a novel approach allowing for use of a liquid refrigerant capable of achieving lower nadir temperatures was tested in a canine model with cavo-tricuspid isthmus (CTI) and left atrial (LA) ablation...
January 2014: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/24014804/clinical-response-with-adaptive-crt-algorithm-compared-with-crt-with-echocardiography-optimized-atrioventricular-delay-a-retrospective-analysis-of-multicentre-trials
#18
MULTICENTER STUDY
Jagmeet P Singh, William T Abraham, Eugene S Chung, Tyson Rogers, Alex Sambelashvili, James A Coles, David O Martin
AIMS: Adaptive cardiac resynchronization therapy (aCRT) is a novel algorithm for CRT pacing that provides automatic ambulatory selection between synchronized left ventricular (LV) or bi-ventricular (BiV) pacing and optimization of atrioventricular (AV) and inter-ventricular (VV) delays based on periodic measurement of intrinsic conduction. We aimed to compare the clinical response between aCRT and standard CRT in historical trials. METHODS AND RESULTS: The treatment arm of the aCRT trial was compared with a pooled historical control (HC) derived from the CRT arms of four clinical trials (MIRACLE, MIRACLE ICD, PROSPECT, and InSync III Marquis) with respect to the proportion of patients who had an improved clinical composite score (CCS) at the 6-month follow-up...
November 2013: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/23696627/antiarrhythmic-effect-of-cardiac-resynchronization-therapy-with-triple-site-biventricular-stimulation
#19
COMPARATIVE STUDY
Michio Ogano, Yu-ki Iwasaki, Jun Tanabe, Hisato Takagi, Takuya Umemoto, Meiso Hayashi, Yasushi Miyauchi, Kyoichi Mizuno
AIMS: The antiarrhythmic effect of triple-site biventricular stimulation (Tri-V) is poorly understood. This study aims to evaluate the effect of cardiac resynchronization therapy (CRT) on ventricular arrhythmia (VA) with Tri-V using a single right ventricular (RV) and double left ventricular (LV) lead. METHODS AND RESULTS: Over a period of 3.5 years, 58 consecutive patients with New York Heart Association class II-IV heart failure, an LV ejection fraction of ≤ 0...
October 2013: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/23549231/atrial-fibrillation-and-heart-failure-beyond-the-heart-rate
#20
REVIEW
Anuj Garg, Nazem Akoum
PURPOSE OF REVIEW: Atrial fibrillation and heart failure are two of the most prevalent cardiovascular disease conditions. They often coexist and lead to significant morbidity and mortality. Adequate management strategies for this dual epidemic continue to be the subject of many research studies. RECENT FINDINGS: Recent clinical trials suggest that a rhythm control strategy for atrial fibrillation does not offer a survival advantage over rate control in heart failure patients with reduced systolic function...
May 2013: Current Opinion in Cardiology
keyword
keyword
89612
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"