Search Results
Results 151 - 200 of 2022
1 2 3 4 5 6 7 8 9 10 >
Albouaini K - - 2009
The right ventricular apex (RVA) has been the elective site for placing endocardial pacing leads since 1959 when Furman described the use of the transvenous route for pacemaker implantation. This site was used because it is easily accessible, readily identified and associated with a stable position and reliable chronic pacing ...
Maraschiello Mark A - - 2009
AIM: The study aimed to determine if right ventricular apical pacing is associated with adverse change in atrial substrate compared with right ventricular septal pacing. METHODS: Patients with septal leads and dual-chamber devices with more than 3 months of follow-up and 70% or higher cumulative percentage of ventricular pacing were ...
Guiraudon Gerard M - - 2009
: To test an alternative to catheter and open-heart techniques, by documenting the feasibility of implanting an unmodified mechanical aortic valve (AoV) in the off pump, beating heart using the universal cardiac introducer (UCI) attached to the left ventricular (LV) apex. : In six pigs, the LV apex was exposed ...
Valzania Cinzia - - 2009
BACKGROUND: Intracardiac impedance (ICZ) has been known to reflect contractile capacity of the heart, and a strong relationship has been documented between stroke volume and ICZ. In this pilot study, conducted in heart failure patients during implantation of a biventricular device, we investigated acute changes in multiple vector ICZ signals ...
Munclinger Miroslav - - 2010
Early electrocardiographic diagnosis of acute coronary ischaemia on the paced electrocardiogram is possible [H. Kilic, E. Atalar, N. Ozer, K. Ovunc, S. Aksoyek, F. Ozmen, R. Akdemir. Early electrocardiographic diagnosis of acute coronary ischaemia on the paced electrocardiogram. Int J Cardiol 2008; 130: 14-18.] and could be helpful in an ...
Tops Laurens F - - 2009
Cardiac pacing is the only effective treatment for patients with sick sinus syndrome and atrioventricular conduction disorders. In cardiac pacing, the endocardial pacing lead is typically positioned at the right ventricular (RV) apex. At the same time, there is increasing indirect evidence, derived from large pacing mode selection trials and ...
van Opstal Jurren M - - 2009
Para-Hisian pacing at high output simultaneously captures the His bundle or proximal right bundle, as well as the adjacent ventricular myocardium. At lower output, direct His-bundle, or right-bundle, capture is lost which causes an increase in the stimulus to atrium interval. We describe a case with an increment of 68 ...
Dabrowska-Kugacka Alicja - - 2009
BACKGROUND: Optimal right ventricular (RV) pacing site in patients referred for permanent cardiac pacing remains controversial. A prospective randomized trial was done to compare long-term effect of permanent RV apex (RVA) vs RV outflow tract (RVOT) pacing on the all-cause and cardiovascular mortality. METHODS AND RESULTS: A total of 122 ...
Takemoto Yoshio - - 2009
BACKGROUND: Right ventricular septal (RVS) pacing is an alternative to right ventricular apical (RVA) pacing, but there is limited information about its influence on long-term left ventricular (LV) synchrony and function. METHODS AND RESULTS: A total of 55 patients undergoing dual-chamber pacemaker implantation with normal QRS duration and preserved LV ...
van Deursen Caroline - - 2009
BACKGROUND: We investigated the benefits of the more physiological activation achieved by left ventricular (LV) endocardial pacing (ENDO) as compared with conventional epicardial (EPI) LV pacing in cardiac resynchronization therapy. METHODS AND RESULTS: In 8 anesthetized dogs with experimental left bundle-branch block, pacing leads were positioned in the right atrium, ...
Silberbauer John - - 2009
AIMS: Right ventricular pacing increases the risk of persistent atrial fibrillation (AF) in the long term. The effects of right ventricular pacing on paroxysmal AF (PAF) are unknown. The aim was to examine the effect of right ventricular pacing on AF burden (AFB) in patients with symptomatic drug-resistant PAF. Pooled ...
Czunko Agnieszka - - 2009
BACKGROUND: The VDD/R pacing is accepted as an alternative to DDD/R pacing in patients with atrioventricular conduction block (AVB) and intact sinus node function. AIM: To determine the relationship between parameters obtained during assessment of the patient for the implantation procedure, using electrocardiographic (ECG) and echocardiographic (ECHO) data, and the ...
Lakshmanadoss Umashankar - - 2009
Atrioventricular nodal (AVN) ablation with concomitant pacemaker implantation is one of the strategies that reduce symptoms in patients with atrial fibrillation (AF). However, the long-term adverse effects of right ventricular (RV) apical pacing have led to the search for alternating sites of pacing. Biventricular pacing produces a significant improvement in ...
Herweg Bengt - - 2009
This report describes the nonsurgical elimination of intractable diaphragmatic stimulation by partial withdrawal of a left ventricular (LV) pacing lead (in the coronary venous system) with resultant preservation of LV pacing. The procedure entailed the use of a deflectable catheter in the right atrium for ensnaring the LV lead. At ...
Lotze Ulrich - - 2009
BACKGROUND: Bipolar low polarization electrodes are recommended for a regular AutoCapture (St. Jude Medical, Inc., Sylmar, CA, USA) function in order to effectively detect the evoked response (ER) signal. The objective of this national multicenter registry was to evaluate the electrical performance and the AutoCapture characteristics of the bipolar ventricular ...
Sata Naoyuki - - 2009
OBJECTIVE: Washout rate of iodine-123 metaiodobenzylguanidine (MIBG) myocardial scintigraphy is correlated with the degree of myocardial damage. The aim of this study is to ascertain whether there is any relationship between QRS complex duration at right ventricle (RV) pacing and the degree of myocardial damage assessed by I-123 MIBG myocardial ...
Drago Fabrizio - - 2010
We describe the case of a newborn with isolated noncompaction of the ventricular myocardium, congenital atrioventricular block, and prolonged QT, who developed a dilated cardiomyopathy after 4 months of right ventricular permanent pacing. The implanted system was upgraded to biventricular pacing. Resynchronization therapy was associated with normalized septal motion and ...
Pachón Mateos José Carlos - - 2009
Despite having a huge benefit in enabling heart rate control, cardiac pacing by stimulating the right ventricular apex causes an artificial iatrogenic left bundle-branch block-like syndrome. As a result, QRS widening and cardiac wall desynchronization occurs. The problems caused by this undesirable pacemaker side effect have been ignored, as they ...
Tomaske Maren - - 2009
AIMS: Right ventricular (RV) pacing may cause dyssynchronous left ventricular (LV) contraction and systolic dysfunction. Left ventricular-based pacing may prevent such deterioration. The aim of this study was to evaluate ventricular synchrony and function with permanent LV pacing (LVP) vs. RV pacing (RVP) in paediatric patients with normal cardiac anatomy. ...
Madershahian Navid - - 2009
OBJECTIVE: Data on coronary artery bypass grafts flows in patients with atrial fibrillation (AF) requiring epicardial ventricular pacing is lacking. This study aimed to evaluate the optimal epicardial ventricular pacing site in patients with AF following coronary artery bypass surgery (CABG). METHODS: In 23 consecutive patients (mean age = 69.2 ...
Chun K R Julian - - 2009
BACKGROUND: Cryoballoon ablation (Arctic Front, Cryocath) represents a novel technology for pulmonary vein isolation (PVI). The initial phase of a freeze is crucial for cryolesion formation which is determined by local temperature depending on blood flow. We investigated the impact of right ventricular rapid pacing (RVRP) on temperature kinetics in ...
Deplagne Antoine - - 2009
There is no gold standard technique for quantification of ventricular dyssynchrony. To investigate whether additional real-time three-dimensional morphologic assessment of ventricular dyssynchrony affects response after biventricular pacing. Forty-one patients with severe heart failure were implanted with a biventricular pacing device and underwent two-dimensional (time dispersion of 12 left ventricular electromechanical ...
Chen Chun-An - - 2009
BACKGROUND: Pediatric patients paced for complete atrioventricular block (CAVB) are at risk of developing dilated cardiomyopathy (DCM). We sought to explore the role played by the setting of ventricular pacing. METHODS AND RESULTS: A total of 35 patients <18 years of age at diagnosis were enrolled. Twenty-eight (80%) received pacemakers ...
Kudenchuk Peter J PJ University of Washington, Seattle, Washginton 98195-6422, - - 2009
Slower heart rates are believed to confer a better prognosis in heart disease. The Dual Chamber and VVI Implantable Defibrillator (DAVID) Trial found that patients with ventricular dysfunction and isolated sinus bradycardia (rate <60 with normal PR interval) had an unusually low incidence of heart failure (HF) hospitalization and mortality ...
Aktas Mehmet Kemal - - 2009
Loss of biventricular (BiV) pacing occurs during ventricular sensed events such as frequent ventricular ectopy, nonsustained ventricular tachycardia, and intrinsic atrioventricular nodal conduction, such as in atrial fibrillation. Ventricular sense response (VSR) pacing, a novel cardiac resynchronization therapy pacing strategy, maintains BiV pacing during these sensed ventricular events. Patients who ...
Vancura Vlastimil - - 2009
Compared to the natural electrical activation of the myocardium through the His-Purkinje system, right ventricular pacing is associated with prolonged QRS complex duration, thereby impeding the synchronicity of contractions. In left ventricular pacing, a higher pacing voltage decreases the QRS complex duration. The aim of our study was to describe ...
Matsushita Satoshi - - 2009
BACKGROUND: Altered myocardial distribution of gap junctions and intercellular coupling have been implicated in nonuniform conduction of the depolarization wave and repolarization asynchrony in the mammalian heart. We tested the hypothesis that short-term cardiac pacing is associated with structural remodeling of gap junctions and their altered spatial distribution in cardiac ...
Dabrowska-Kugacka Alicja - - 2009
OBJECTIVES: Investigation of which atrial pacing modality provides atrial synchrony and the most physiological atrial contraction pattern in patients with brady-tachycardia syndrome. METHODS: Fifteen healthy subjects and 57 patients with sinus node dysfunction, atrial fibrillation recurrences, and prolonged P-wave on the electrocardiogram treated with multisite atrial (MSA) pacing were studied. ...
Cosín-Aguilar Juan J Cardiocirculatory Unit, Research Center, Hospital La Fe, Valencia, Spain. - - 2009
High-rate short-duration ventricular pacing induces myocardial hypokinesis that persists once the hemodynamic conditions have been recovered. The aim was to study the factors that determine the persistence of myocardial dysfunction when ventricular tachycardia has ceased and hemodynamic conditions have been restored. An in vivo experimental pig model was used consisting ...
Tse Hung-Fat - - 2009
AIMS: The deleterious effects of right ventricular apex (RVA) pacing may offset the potential benefit of ventricular rate (VR) regularization during atrial fibrillation (AF). Recent studies suggested that right ventricular septal (RVS) pacing may prevent the potential deleterious effects of RVA pacing and enhance the VR regularization (VRR) with ventricular ...
Tse Hung-Fat - - 2009
BACKGROUND: Right ventricular (RV) apical pacing results in abnormal left ventricular (LV) electrical and mechanical activation and is associated with an increased risk of developing heart failure. Chronic RV septal pacing has been shown to be superior to RV apical pacing in newly implanted patients. However, whether RV septal pacing ...
Yoon Hee Jeoung - - 2009
INTRODUCTION: The synchrony of the pacing heart can be affected by the right ventricular (RV) pacing site and is crucial to cardiac function in pacemaker recipients. We evaluated the acute changes in cardiac synchrony according to the RV pacing sites in normal systolic functioning subjects with normal QRS. METHODS: We ...
Hanke Thorsten - - 2009
OBJECTIVE: Patients with severely reduced left ventricular function undergoing coronary artery bypass grafting have increased complication rates. We hypothesized that temporary postoperative atrial synchronous biventricular pacing would improve left ventricular function after cardiopulmonary bypass. METHODS: A left ventricular pressure-volume catheter was placed in 21 patients undergoing coronary artery bypass grafting ...
Chung Eugene H - - 2009
Patients with Medtronic Sprint Fidelis (Medtronic Inc., Minneapolis, MN, USA) lead failures present with oversensing, resulting in pacing inhibition and inappropriate shocks. We present a case of lead noise from the right ventricular (RV) ring conductor, resulting in multiple inappropriate shocks with subsequent pacing inhibition and syncope. RV pacing lead ...
Miri Raz - - 2009
BACKGROUND: The efficacy of cardiac resynchronization therapy through biventricular pacing (BVP) has been demonstrated by numerous studies in patients suffering from congestive heart failure. In order to achieve a guideline for optimal treatment with BVP devices, an automated non-invasive strategy based on a computer model of the heart is presented. ...
Kaye Gerry - - 2009
BACKGROUND: The optimal site to permanently pace the right ventricle (RV) has yet to be determined. To address this issue, three randomized prospective multicenter clinical trials are in progress comparing the long-term effects of RV apical versus septal pacing on left ventricular (LV) function. The three trials are Optimize RV ...
Maisenbacher Herbert W - - 2009
OBJECTIVE-To compare the acute effects of cardiac pacing from various transvenous pacing sites on left ventricular (LV) function and synchrony in clinically normal dogs. ANIMALS-10 healthy adult mixed-breed dogs. PROCEDURES-Dogs were anesthetized, and dual-chamber transvenous biventricular pacing systems were implanted. Dogs were paced in single-chamber mode from the right atrial ...
Eberhardt Frank - - 2009
OBJECTIVES: Biventricular pacing acutely improves left ventricular function in patients with heart failure and left ventricular dyssynchrony. Pressure-volume loop analysis has shown acute perioperative hemodynamic benefits of biventricular pacing immediately after weaning from cardiopulmonary bypass in patients undergoing coronary artery bypass grafting, but whether these effects can be maintained for ...
Vaughan Paul - - 2009
A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was whether biventricular pacing provides a superior cardiac output compared to univentricular pacing wires after cardiac surgery. Using the reported search, 439 papers were found from which 13 papers represented the best evidence ...
Shvilkin Alexei - - 2009
BACKGROUND: Cardiac memory (CM) refers to persistent T-wave changes on resumption of normal conduction after a period of abnormal ventricular activation. Traditionally, to observe CM, normal ventricular activation had to be restored, limiting the exploration of this phenomenon in clinical practice. OBJECTIVE: This study sought to prove that CM can ...
Bergman Bryan C - - 2009
There is minimal in vivo data in humans evaluating myocardial substrate utilization during increased heart work. This study was performed to determine the balance of myocardial glucose and lactate metabolism during rest and increased heart work induced by atrial pacing in seven healthy men and women (age, 49.7 +/- 3.9 ...
Gebauer Roman A - - 2009
To identify risk factors for left ventricular (LV) dysfunction in right ventricular (RV) pacing in the young. methods and results: Left ventricular function was evaluated in 82 paediatric patients with either non-surgical (n = 41) or surgical (n= 41) complete atrioventricular block who have been 100% RV paced for a ...
Ceresnak Scott R - - 2009
Epicardial pacing is the standard approach for permanent pacing in small children and patients with functionally univentricular physiology. The longevity of epicardial leads, however, is compromised by increased occurrences of exit block and lead fractures. We report our experience with a technique of placing a second ventricular lead, and attaching ...
Parakh Neeraj - - 2009
Coronary guide wires can be used for pacing the left ventricle during coronary angioplasty, however the experience with modern coronary guide wires as pacing wires is limited. The aim of this study was to determine the safety and efficacy of currently used coronary guide wires for transcoronary pacing. Transcoronary pacing ...
Lee Kathy L - - 2009
BACKGROUND: Left ventricular stimulation for cardiac resynchronization therapy is largely limited by access and anatomy of coronary veins. OBJECTIVE: This study sought to apply ultrasound-mediated leadless pacing technology in heart failure patients and to evaluate the effects of respiration and body posture on the acoustic window. METHODS: Patients with advanced ...
Ng Arnold C T - - 2009
Right ventricular (RV) septal pacing has been advocated as an alternative to apical pacing to avoid long-term detrimental effects. There is conflicting evidence on the benefits of RV septal pacing. Fifty-five subjects (22 normal healthy controls, 17 with RV septal pacing, and 17 with apical pacing) were recruited. Midventricular short-axis ...
Cannesson Maxime - - 2009
The aims of this study were to test the hypotheses that in the postoperative period after coronary artery bypass graft surgery (1) atrio-right ventricular (RA-RV) pacing induces a decrease in cardiac output compared with RA pacing alone and (2) atrio-biventricular (RA-BiV) pacing improves CO compared with RA-RV pacing. A prospective ...
Roos Markus - - 2009
AIMS: Pharmacological conditioning of the phrenic nerve can positively influence systolic performance, and diaphragm activation improves ventilatory function. Here we investigate whether pacing-induced diaphragmatic stimulation (PIDS) may improve left ventricular (LV) systolic function. METHODS AND RESULTS: We studied a total of 35 patients (4 females, mean age 67 +/- 9 ...
Medi Caroline C Department of Cardiology, The Royal Melbourne Hospital, Melbourne, - - 2009
The detrimental effects of right ventricular apical pacing on left ventricular function has driven interest in selective site pacing, predominantly on the right ventricular outflow tract (RVOT) septum. There is currently no information on long-term ventricular lead electrical performance from this site. A total of 100 patients with ventricular lead ...
Koplan Bruce A - - 2009
OBJECTIVES: The goal of this analysis was to determine the appropriate biventricular pacing target in patients with heart failure (HF). BACKGROUND: Cardiac resynchronization therapy (CRT) decreases the risk of death and HF hospitalization. However, the appropriate amount of biventricular pacing is ill-defined. METHODS: Mortality and HF hospitalization data from patients ...
1 2 3 4 5 6 7 8 9 10 >