Search Results
Results 201 - 250 of 2022
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Bohora Shomu - - 2010
Ventricular perforation, late after ventricular lead placement at the right ventricular apex is rare, and though, commonly presents with chest pain, loss of pacing and/or sensing, and hemodynamic instability caused by cardiac tamponade, it can rarely cause left sided hemothorax needing surgical exploration.
Ding Li-Gang - - 2009
OBJECTIVE: The purpose of this study is to investigate the potential to induce electrical remodeling by chronic right ventricular apical (RVA) in patients with sinus node dysfunction. METHODS: Ninety-two patients with sinus node dysfunction who underwent initial pacemaker implantation were included in the study. During routine clinic visits, electrocardiograms and ...
Adachi Masamitsu - - 2009
During para-Hisian pacing, widening of the paced QRS complex usually indicates loss of His bundle capture. We describe a patient without any accessory pathways in whom widening of the paced QRS complex occurred due to loss of left bundle branch capture during para-Hisian pacing. After initial widening of the QRS ...
Sanaa Islem - - 2009
Clinical trials in patients with pacemakers for sinus node dysfunction or atrioventricular block have highlighted the fact that desynchronization of ventricular contraction induced by right ventricular apical pacing is associated with long-term morbidity and mortality. These clinical data confirm pathophysiological results indicating that right ventricular apical pacing causes abnormal ventricular ...
Lopez J Alberto - - 2009
We describe the successful use of a percutaneous, transvenous endocardial approach to atrioventricular pacing and cardiac defibrillation in an adult born with Ebstein's anomaly who had undergone tricuspid valve repair. The patient has systolic left ventricular dysfunction, congestive heart failure, and sinus node dysfunction. Ventricular pacing and sensing was obtained ...
Logeart Damien - - 2009
This study was designed to compare the specific effects of two heart rates (HR), 55 and 75 b.p.m., in patients with heart failure (HF). Patients with chronic HF, left ventricular ejection fraction (LVEF) </= 35%, and a pacemaker with >90% of paced QRS, were included in a randomized cross-over trial ...
Bahl Ajay - - 2009
Paced rhythms can mask ECG changes of several conditions. ECG changes due to hyperkalemia during paced rhythm have not been well described. We report a patient with isolated noncompaction of left ventricle with left ventricular dysfunction and complete heart block on a permanent pacemaker who developed hyperkalemia. Typical ECG changes ...
Anselmino Matteo - - 2009
Transvenous endocardial pacing through classical implantation of a pace/sensing lead in the right ventricle is strictly contraindicated in patients with a mechanical tricuspid valve. Usually permanent pacing is achieved by an epimyocardial surgical approach. We hereby describe the implantation of a single site left ventricle pacing lead in the anterior ...
Gulmez Oyku - - 2009
Left atrium (LA) plays an important role in left ventricular filling. It is well known that right ventricular apical pacing has unfavorable effects on ventricular systolic and diastolic performance. The aim of this study is to evaluate the LA mechanical functions with 2D echocardiography in patients with a permanent pacemaker ...
Shokrollahi Elnaz E Ryerson University, Toronto, CA M5B 2K3. - - 2009
The aim of this study is to determine if some of the characteristics of reconstructed unipolar electrograms from the noncontact mapping system can be used to detect epicardial electrical activation in a canine heart. This would help the electrophysiologist know where exactly the origin or the critical point in tissue ...
Lian Jie J Micro Systems Engineering, Inc., Lake Oswego, OR 97035, USA. - - 2009
Long term right ventricular apical pacing has been known to have adverse effects in cardiac function. The AV hysteresis (AVH) is a feature existing in many dual-chamber cardiac pacemakers that aims to minimize the right ventricular pacing, but its clinical efficacy remains inconclusive due to conflicting evidence from different studies. ...
Minami Yuichiro - - 2010
This study examines acute effect of dual-chamber (DDD) pacing combined with disopyramide for left ventricular outflow tract (LVOT) gradient reduction in obstructive hypertrophic cardiomyopathy (HCM) patients. Among 24 patients refractory to maximal drug therapy, 7 had a significant improvement of LVOT gradient by DDD pacing alone. In the remaining 17 ...
Bergman Bryan C - - 2009
There is limited in vivo data in humans evaluating myocardial fat utilization during increased heart work. This study was done to determine myocardial free fatty acid (FFA) metabolism during rest and atrial pacing, which increases cardiac work without changing arterial substrate concentration. We studied seven healthy men and women (age ...
Su Yangang - - 2010
The objective of this study was to compare the optimal atrioventricular delay (OAVD) paced from right ventricular outflow tract (RVOT) with that paced from right ventricular apex (RVA) in patients implanted with DDD pacemaker. A total of 43 patients implanted with DDD pacemaker due to high or third degree atrioventricular ...
Porto Italo - - 2008
Guidewires used during percutaneous coronary interventions have elevated conductance, and, when in place, are electrically isolated from the body fluids by the guiding catheter. In this paper, we present an overview of two simple techniques exploiting these unique conditions to record local electrical activity in the myocardium and to pace ...
Bai Rong - - 2008
Current permanent right ventricular and right atrial endocardial pacing leads are implanted utilizing a central lumen stylet. Right ventricular apex pacing initiates an abnormal asynchronous electrical activation pattern, which results in asynchronous ventricular contraction and relaxation. When pacing from right atrial appendage, the conduction time between two atria will be ...
Madias John E - - 2008
A patient with complete atrioventricular block after hemodialysis (HD) for which he had a permanent pacemaker implanted showed attenuation of the amplitude of the intrinsic and paced QRS complexes while awaiting HD, and augmentation of paced QRS complexes after HD. These QRS perturbations correlated with the changes in his weight. ...
Friedberg Mark K - - 2009
BACKGROUND: Right ventricular (RV) pacing may be detrimental to ventricular function. However, the acute effects of electromechanical dyssynchrony on RV function are not well characterized in children. We studied acute effects of electromechanical dyssynchrony, induced by RV apical and RV outflow pacing, in children with normal hearts, evaluating electromechanical synchrony, ...
Puglisi Andrea - - 2008
BACKGROUND: Optimizing dual-chamber pacing to prevent recurrences of atrial tachyarrhythmias (AT) in sinus node dysfunction is still debated. Despite the large number of studies, efficacy of sophisticated preventive algorithms has never been proven. It is not clear whether this is due to imperfect study designs or to a substantial inefficacy ...
Toggweiler Stefan - - 2008
The intention of this study was to evaluate the short-term effect of right ventricular (RV) pacing on cardiorespiratory function in patients with a biventricular pacemaker. A group of 26 patients with a biventricular pacemaker was enrolled in this cross-over, single-blind study. All patients underwent spiroergometry and electrocardiography in RV and ...
Bongiorni Maria Grazia - - 2008
The aim of the present study was to describe a 10 years single-centre experience in pacing and defibrillating leads removal using an effective and safe modified mechanical dilatation technique. We developed a single mechanical dilating sheath extraction technique with multiple venous entry site approaches. We performed a venous entry site ...
Lian Jie - - 2009
Modern cardiac pacemaker can sense electrical activity in both atrium and ventricle, and deliver precisely timed stimulations to one or both chambers on demand. However, little is known about how the external cardiac pacing interacts with the heart's intrinsic activity. In this study, we present an integrated dual-chamber heart and ...
Love Charles J - - 2009
Several methodologies are typically employed to extract chronically-implanted pacing leads including: laser catheter systems, radio frequency catheters, mechanical cutting catheters, and/or direct traction. In the present study, Visible Heart(R) methodologies were employed to obtain novel internal and external views of such extractions. Utilizing standard cardioplegia procedures, canine hearts (n = ...
Nitardy Aischa - - 2009
BACKGROUND: Right ventricular (RV) pacing increases the incidence of atrial fibrillation (AF) and hospitalization rate for heart failure. Many patients with sinus node dysfunction (SND) are implanted with a DDDR pacemaker to ensure the treatment of slowly conducted atrial fibrillation and atrioventricular (AV) block. Many pacemakers are never reprogrammed after ...
Erdoğan Okan - - 2008
OBJECTIVE: The aim of the present study was to investigate long-term safety and change in pacing parameters of right ventricular outflow tract (RVOT) pacing. METHODS: This prospectively designed controlled clinical study comprised patients in Group 1 (n=16) and Group 2 (n=16) who were paced in RVOT and right ventricular apex ...
Kobayashi T - - 2008
Cardiac pacing often turns out to be the only effective treatment of severe, life-threatening arrhythmias. We performed 77 living-donor liver transplantations (LDLT) from 1999 to 2007. In these cases, three recipients experienced fatal arrhythmia and required temporary cardiac pacing during the perioperative period. The first case was a 68-year-old woman ...
Karagöz Tevfik - - 2008
OBJECTIVES: The main objective of this study is to describe a new technique for rapid ventricular pacing to maintain balloon stability during balloon aortic valvuloplasty (BAV) without using transvenous temporary pacemaker electrode. BACKGROUND: The safety and efficacy of rapid right ventricular pacing to facilitate balloon stability during BAV has been ...
de Cock C C - - 2008
Fifty years after its introduction, cardiac pacing has evolved from an experimental medical treatment to an expanding field in today's cardiology. Only recently there is accumulating evidence that prolonged stimulation of the right ventricular apex is associated with clinically significant adverse effects. In this commentary, the potential adverse effects are ...
de Voogt W G - - 2008
The diagnostic programmes of modern pacemakers have increased our knowledge of atrial tachyarrhythmias (ATAs) in chronically paced patients. These programmes also support the evaluation of the effects of pharmacological treatment of ATAs. The success of interruption and/or prevention of ATAs with pacemakers depends strongly on the diagnostic accuracy and the ...
El Gamal M - - 2008
In patients with sick sinus syndrome and normal atrioventricular conduction, physiological pacing can be accomplished with either a single chamber atrial pacemaker AAI/R or a dual chamber pacemaker DDD/R. The single chamber device has the advantages of simpler implantation and lower initial costs, while the dual chamber device offers protection ...
Kaszala Karoly K Medical College of Virginia, PO Box 980053, Richmond, VA 23298-0053, USA. - - 2008
Pacemaker therapy is most commonly initiated because of symptomatic bradycardia, usually resulting from sinus node disease. Randomized multicenter trials assessing the relative benefits of different pacing modes have made possible an evidence-based approach to the treatment of bradyarrhythmias. During the past several decades, major advances in technology and in our ...
Chung Eugene S - - 2009
Deleterious left ventricular remodeling routinely occurs after myocardial infarction (MI) and novel strategies to attenuate this phenomenon may prove valuable. Here, we describe the potential role of left ventricular (LV) peri-infarct pacing (delivered via biventricular pacemakers) to reduce post-MI remodeling. Regional wall stress in the infarcted area is predictive of ...
Del Ry Silvia - - 2008
C-type natriuretic peptide (CNP) was recently found in the myocardium, but possible insights into differences between atrium and ventricle production are so far lacking. Our aim was to evaluate, in an experimental model of pacing-induced heart failure (HF), plasma and tissue levels of CNP and mRNA expression of the peptide ...
Zhang Qing - - 2008
BACKGROUND: This study compared the prevalence and pattern of mechanical dyssynchrony in patients with normal heart and right ventricular apical (RVA) pacing versus patients with systolic heart failure (SHF) and spontaneous left bundle branch block (LBBB). METHODS: A total of 112 patients having LBBB pattern on surface electrocardiogram were included ...
Gao Zhong - - 2008
Heart failure (HF) is the leading cause of morbidity and mortality in the industrialized world. While the transcriptomic changes in end-stage failing myocardium have received much attention, no information is available on the gene expression patterns associated with the development of HF in large mammals. Therefore, we used a well-controlled ...
Loricchio Maria Luisa - - 2008
A 68-year-old woman affected by sick sinus syndrome was implanted with a dual-chamber pacemaker provided by home monitoring technology. After discharge, an increase in ventricular threshold and a high variability of R wave measurements were detected early by the home monitoring system. Manual tests confirmed the presence of pacing and ...
Płońska-Gosciniak Edyta - - 2008
AIM: Assessment of safety, diagnostic, and prognostic value of a stress echocardiography protocol based on rapid pacing in patients with implanted permanent pacemakers according to the pacing mode (AAI/DDD or VVI) and concomitant antiischemic therapy. MATERIAL AND METHODS: 149 rapid pacing stress echo tests were performed in 100 patients (33 ...
Parekh Sameer - - 2008
Although it has become traditional to place permanent pacemaker leads at the right ventricular apex and right atrial appendage, pacing from these locations poorly mimics normal physiology. A growing evidence base shows that right ventricular apical pacing results in ventricular dyssynchrony and various adverse effects. Provocative data from early trials ...
Siu Chung-Wah - - 2008
Emerging data from experimental and clinical studies have shown that right ventricular (RV) apical pacing led to abnormalities of ventricular activation and contraction, and impairment of myocardial perfusion with adverse left ventricular (LV) remodeling, which was associated with increased risk of cardiac morbidity and mortality. As a result, there is ...
Funck Reinhard C - - 2008
BACKGROUND: Dual-chamber (DDD) pacing has generally been regarded as "physiologic pacing" and therefore expected to be superior to ventricular pacing. Major randomized trials have so far failed to demonstrate significant reductions in the incidences of mortality, stroke, and heart failure. It has been shown that unnecessary ventricular pacing in patients ...
Kontogeorgis Andrianos A Leon H. Charney Division of Cardiology, Department of Medicine, New York University School of Medicine, New York, NY 10016, - - 2008
Gap junction redistribution and reduced expression, a phenomenon termed gap junction remodeling (GJR), is often seen in diseased hearts and may predispose toward arrhythmias. We have recently shown that short-term pacing in the mouse is associated with changes in connexin43 (Cx43) expression and localization but not with increased inducibility into ...
Nägele Herbert - - 2008
AIMS: Chronotropic incompetence (CI) in patients with congestive heart failure (CHF) develops frequently under beta-blocker and amiodarone therapy. It can be corrected by pacing. We performed a randomized study to test whether pacing is beneficial in CHF patients with CI. METHODS AND RESULTS: Congestive heart failure patients under combined beta-blocker ...
Imperadore F - - 2008
Usually, therapeutic decisions in patients with acute chest pain are based on the 12-lead electrocardiogram because ST-segment elevation is highly specific for myocardial infarction, but the presence of pacing-induced repolarization changes makes electrocardiogram interpretation difficult. The authors report an acute myocardial infarction patient with ventricular paced rhythm successfully treated by ...
Mixon Timothy A - - 2008
Rheolytic thrombectomy (RT) is useful in certain percutaneous coronary interventions but may be associated with transient bradyarrhythmias. Clinicians have devised numerous strategies to deal with these arrhythmias apart from transvenous right ventricular pacing, some of which are described in other parts of this supplement. We report the Scott & White ...
Brignole Michele - - 2008
An acute comparative study of right ventricular (RV) pacing and echocardiographically guided cardiac resynchronization pacing (CRP) was performed in patients who underwent "ablate and pace" therapy for permanent atrial fibrillation. It was hypothesized that optimized CRP guided by tissue Doppler echocardiography would exert an additive beneficial hemodynamic effect to that ...
Hayashi Meiso - - 2008
Ventricular safety pacing (VSP) is an algorithm used to prevent crosstalk inhibition and ventricular capture during the vulnerable period. We report a 78-year-old man with implantable dual-chamber defibrillator, in whom clusters of ventricular tachycardias (VTs) were provoked by the VSP. During rapid DDDR pacing, the delivery of the VSP after ...
Lim Sern H - - 2008
Biventricular pacing has been shown to improve the overall clinical outcomes in patients with systolic heart failure and ventricular conduction delay on electrocardiogram. As correction of ventricular dyssynchrony is the putative mechanism of benefit, biventricular pacing is also termed as cardiac resynchronization therapy. The development of separate programmability of right ...
Gupta Akshay - - 2008
Surgical lead placement is generally considered as a last resort for patients who require permanent pacing and who are unable to accommodate transvenous leads. The technique is limited by the need for direct epicardial access and reduced reliability of epicardial leads (compared with modern transvenous leads) [Belott and Reynolds. Permanent ...
Bordachar Pierre - - 2008
AIMS: Late after surgical repair, adults with Tetralogy of Fallot (TOF) commonly present with right ventricular (RV) dysfunction and right bundle branch block (RBBB). We aimed at (i) investigating whether this prolonged RV conduction induced detrimental electromechanical dyssynchrony in both RV and left ventricle (LV) and (ii) determining the acute ...
Kutalek Steven P - - 2008
BACKGROUND: The dual chamber and VVI implantable defibrillator (DAVID) trial demonstrated that dual chamber (DDDR) pacing in defibrillator candidates with impaired ventricular function and no established indication for pacing resulted in worsened congestive heart failure (CHF) or death. Many patients had abnormalities for which pacing is often advocated to improve ...
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