Search Results
Results 501 - 550 of 1641
< 6 7 8 9 10 11 12 13 14 15 16 >
Sternick Eduardo Back - - 2005
Short A-V manheim fiber. INTRODUCTION: A short atrioventricular decrementally conducting accessory pathway is an uncommon variant of preexcitation. Available data from small series suggest that their decremental properties might not be caused by A-V nodal-like tissue. METHODS: We compared clinical, electrocardiographic and electrophysiologic parameters in two groups of patients: 8 ...
Tse Hung-Fat - - 2005
Upon standing from a supine position, the normal response is an increase in heart rate to maintain blood pressure (BP). In patients with chronotropic incompetence, heart rate may not increase upon standing, and they may experience orthostatic hypotension (OH). We evaluated a new orthostatic response (OSR) pacing algorithm that uses ...
Vlietstra Ronald E - - 2005
Half of all pacemakers implanted in the United States are for patients aged 75 years and older. The expectations and needs of an older group are different from patients who are younger, yet it is only recently that different pacing mode benefits for elderly persons have been tested in clinical ...
Takenaka Sou - - 2005
Accessory pathways (APs) that can only be ablated from the coronary sinus are likely to be located subepicardially. The electrocardiographic (ECG) and electrophysiological characteristics as well as the immediate radiofrequency ablation success rate and the recurrence rate were compared in 15 patients (11 posteroseptal and 4 left free-wall) with subepicardial ...
Padeletti Luigi - - 2005
AIMS: Several studies have tested non-pharmacological therapies for atrial tachyarrhythmias (ATs) by measuring the cumulative time (burden) the patient spends in arrhythmia. Contradictory results questioned either therapy efficacy or statistical power of the trials. We studied AT burden variability in patients paced for sinus node disease (SND) in order to ...
Cheung Jim W - - 2004
OBJECTIVES: The purpose of this study was to test whether a prolonged (>/=6 seconds) period of AV block in response to adenosine triphosphate (ATP) identifies additional patients at risk for bradycardia who may benefit from pacemaker implantation. BACKGROUND: Bradycardia is a common etiology for syncope in patients without underlying structural ...
Akiyama Masahiro - - 2004
INTRODUCTION: In some patients with left AV accessory pathway (AP), double potentials are recorded along the coronary sinus (CS) during retrograde AP conduction only. This electrophysiologic study was performed to clarify the origin and clinical significance of double potentials in 11 patients. METHODS AND RESULTS: The direction of activation of ...
Sternick Eduardo Back - - 2004
OBJECTIVES: The purpose of the study was to identify the electrocardiographic (ECG) characteristics of the Mahaim fiber. BACKGROUND: Mahaim fibers are slowly conducting accessory pathways reaching into the right ventricle. They often play a role in tachycardias. METHODS: We retrospectively analyzed 40 patients with Mahaim fibers. Five patients had associated ...
Tan Bi-Hua - - 2004
Adenosine infusion can potentially be used as a diagnostic test for sick sinus syndrome (SSS) based on its negative chronotropic effects. Whether autonomic tone underlies adenosine's negative chronotropic effects remains unknown. This study was to investigate the bradycardiac response of sinus node to ATP in patients with and without clinical ...
Sternick Eduardo Back - - 2004
OBJECTIVES: The aim of this study was to prospectively evaluate the sensitivity, specificity, and positive and negative predictive values of previously described ECG criteria to identify preexcited tachycardia due to decrementally conducting accessory pathways (QRS axis between 0 and -75 degrees , QRS width < or = 0.15 seconds, an ...
Biagini Elena - - 2004
The presence of a right bundle branch block (RBBB) is associated with increased mortality. We studied the role of dobutamine stress echocardiography for the prognostic stratification of patients with RBBB. The presence of an abnormal dobutamine stress echocardiography was the strongest predictor of cardiac events and provided incremental prognostic information ...
Soulier Jean - - 2005
Fanconi anemia (FA) is characterized by congenital abnormalities, bone marrow failure, chromosome fragility, and cancer susceptibility. Eight FA-associated genes have been identified so far, the products of which function in the FA/BRCA pathway. A key event in the pathway is the monoubiquitination of the FANCD2 protein, which depends on a ...
Park Hyung-Wook - - 2004
BACKGROUND: Sinus node dysfunction (SND) is caused not only by intrinsic sinus node disease, but also by the extrinsic factors. Among the extrinsic factors, autonomic imbalance is most common. Symptomatic SND usually requires permanent pacemaker therapy. However, the clinical characteristics and patient response to medical therapy for hypervagotonic SND have ...
Silvetti Massimo Stefano - - 2004
Children with single chamber pacemakers, in adolescence and young adulthood, may be upgraded to dual chamber systems, but there are no published data about indications, timing, and complications. Upgrading was attempted in 18 patients with transvenous pacing leads. A retrospective analysis of all collected data was performed. At initial pacemaker ...
Silvetti M S - - 2004
We describe 17 patients (8 girls, and 9 boys), aged 9.6 +/- 5.7 years, with paroxysmal atrioventricular block (PAVB), a condition rarely described in children. Holter monitoring documented the PAVB in 15 patients, and tilt test was performed in 4 patients (positive in 1). The electrocardiograph (ECG) was normal in ...
Sternick Eduardo Back - - 2004
INTRODUCTION: Automatic rhythms associated with Mahaim fibers usually occur during radiofrequency catheter ablation. The incidence and significance of spontaneous automaticity in Mahaim fibers are unknown. METHODS AND RESULTS: Spontaneous automatic rhythms were observed in 5 (12.5%) of 40 patients with Mahaim fibers referred for nonpharmacologic therapy because of recurrent episodes ...
Chetaille Philippe - - 2004
OBJECTIVES: Assessment of clinical outcomes of catheter ablation of atrioventricular reciprocating tachycardias in patients with congenital heart disease (CHD). BACKGROUND: Atrioventricular reciprocating tachycardias occur in patients with CHD and may be poorly tolerated. METHODS: Retrospective review of all 105 such ablations in 83 patients performed between 03/90 and 02/02 at ...
Koscielniak-Nielsen Zbigniew J - - 2004
BACKGROUND AND OBJECTIVES: Axillary or humeral blocks by multiple nerve stimulation (MNS) are used for ambulatory hand surgery. This double-blind study identified which of the three main components of the procedure (repeated needle passes, local anesthetic injections, or electrical stimulations) is most painful, quantified its intensity, and recorded patients' preferences ...
Guo Hangyuan - - 2004
OBJECTIVES: To study the acute results and long-term clinical course after percutaneous transluminal septal myocardial ablation (PTSMA) in symptomatic patients with hypertrophic obstructive cardiomyopathy (HOCM). METHODS: In 18 patients (seven women, 11 men; average age 53+/-15 years) with symptomatic and medically refractory HOCM, 1.3+/-0.4 septal branches were occluded with an ...
Morita Hiroshi - - 2004
BACKGROUND: Some studies have shown that patients with Brugada syndrome (BS) have atrioventricular conduction disturbance, but their sinus node function has not been evaluated. METHODS AND RESULTS: The patients group consisted of 59 male patients and 1 female patient with BS. Supraventricular and ventricular programmed electrical stimulation (PES) was performed. ...
Vanerio Gabriel - - 2004
Patients with a cardioinhibitory response (asystole or atrioventricular block [AVB]) during upright tilt table test (UTT) constitute a therapeutic challenge. Our present knowledge is partial and in those who experience AVB is absent. Furthermore, we ignore if there is any difference between both groups, particularly pacemaker indication. We aimed to ...
Landewé R - - 2004
AIM: To determine the criteria considered important by Dutch rheumatologists in judging whether a patient with ankylosing spondylitis should start tumour necrosis factor (TNF) blocking therapy. METHODS: 19 Dutch rheumatologists were asked to prioritise various demographic and clinical features for their importance in judging whether a patient should be treated ...
Shah Paresh - - 2004
OBJECTIVES: The effects of subthreshold stimulation performed at various sites in the perinodal and posteroseptal space on atrioventricular (AV) nodal conduction were investigated. BACKGROUND: The identification of specific or preferential sites of parasympathetic innervation to the AV node is suggested by observations made in both the animal and clinical laboratories. ...
Singh Balbir - - 2004
BACKGROUND: Mahaim pathways are characterized by the presence of an accessory pathway potential-the 'M' potential, at the tricuspid annulus. M potential is a very useful guide during radiofrequency ablation of Mahaim pathway. During ablation, an accelerated rhythm with ORS morphology, identical to fully pre-excited QRS complex is observed, and has ...
Ernst Sabine - - 2004
BACKGROUND: Catheters are typically stiff and incorporate a pull-wire mechanism to allow tip deflection. While standing at the patient's side, the operator manually navigates the catheter in the heart using fluoroscopic guidance. METHODS AND RESULTS: A total of 42 patients (32 female; mean age, 55+/-15 years) underwent ablation of common-type ...
Okumura Yasuo - - 2004
INTRODUCTION: Dual AV nodal physiology is the electrophysiologic substrate for AV nodal reentrant tachycardia (AVNRT), but the anatomic basis for this arrhythmia remains to be elucidated. Atrial flutter (AFL) has been shown to be more frequently inducible in patients with AVNRT. METHODS AND RESULTS: A 3.2-French, 20-MHz intracardiac ultrasound (ICUS) ...
Liu Shaowen - - 2004
INTRODUCTION: Both concealed conduction and dual pathway physiology are important electrophysiologic characteristics of the AV node. The interaction of AV nodal concealment and duality, however, is not clearly understood. METHODS AND RESULTS: The properties of AV conduction curves in the presence and absence of a conditioning blocked impulse were prospectively ...
Qin Jian Xin - - 2004
We observed the impact of percutaneous transluminal septal myocardial ablation (PTSMA) and myectomy on the conduction system in patients with obstructive hypertrophic cardiomyopathy (HC). Septal reduction intervention is capable of eliminating the left ventricular outflow tract obstruction in patients with obstructive HC; however, conduction system abnormalities are frequent consequences of ...
Shafik Ahmed - - 2004
OBJECTIVES: A recent study has demonstrated that the electric activity of the overactive bladder (OAB) is 'dysrhythmic'. The cause was attributed to a disordered vesical pacemaker which discharges these waves. In a subsequent study, the dysrhythmic waves have been 'normalized' by vesical pacing and the optimal parameters which are required ...
Neri Roberto - - 2003
The cephalic vein (CV) should be preferred to the subclavian vein for the insertion of permanent pacing leads because of better results. Unfortunately, the direct lead introduction using the standard CV cutdown is often unsuccessful. This study evaluated the efficacy and safety of a steerable hydrophilic guidewire (HGW) for lead ...
Pappone Carlo - - 2003
BACKGROUND: Young age and inducibility of atrioventricular reciprocating tachycardia or atrial fibrillation during invasive electrophysiological testing identify asymptomatic patients with a Wolff-Parkinson-White pattern on the electrocardiogram as being at high risk for arrhythmic events. We tested the hypothesis that prophylactic catheter ablation of accessory pathways would provide meaningful and durable ...
Tortoriello Tia A - - 2003
Approximately 60% of children with supraventricular tachycardia (SVT) develop their initial episode by 1 year of age. Despite resolution in most of these patients by 1 year, approximately 30% of the SVT will recur. We performed a retrospective review of all patients <1 year of age with SVT between January ...
Chan Ngai-Yin - - 2003
BACKGROUND AND OBJECTIVES: Biventricular pacing is a new modality of treatment for patients with drug-refractory heart failure and ECG evidence of dyssynchronous ventricular contraction. A third lead is required to be placed in a coronary vein through the coronary sinus for left ventricular pacing, in addition to the atrial and ...
Dagres Nikolaos - - 2003
OBJECTIVES: We investigated possible differences between male and female patients regarding ablation therapy. BACKGROUND: Gender-related differences might have a major impact on different aspects of radiofrequency ablation therapy. Data on this topic are very limited, focusing almost exclusively on success and recurrence rates. METHODS: The study population consisted of 894 ...
Batra A S - - 2003
A case of biopsy-proven myocarditis in a 7-year-old complicated by advanced atrioventricular (AV) block prompted a review of the medical literature to determine the prognosis for recovery of AV conduction or need for pacemaker implantation. A total of 40 patients younger than 20 years of age were identified, with return ...
Ouali Sana - - 2003
Passive-fixation leads positioned inside the coronary sinus (CS) have been found to be effective in LA pacing and sensing, but their use is limited by a high incidence of early and late dislodgment. Since anatomic studies have shown that the proximal part of the CS is surrounded by a relatively ...
Fishberger Steven B - - 2003
The reproducible induction of supraventricular tachycardia (SVT) during electrophysiological study is critical for the diagnosis of atrioventricular nodal reentry tachycardia (AVNRT), and for determining a therapeutic endpoint for catheter ablation. In the sedated state, there are patients with reentry SVT due to AVNRT who are not inducible at electrophysiological study. ...
Brembilla-Perrot B - - 2003
OBJECTIVES: The purpose of the study was to evaluate the frequency of transitory or permanent bundle branch block (BBB) associated with a paroxysmal tachycardia induced by atrial stimulation in patients without heart disease and its significance. METHODS: Esophageal atrial stimulation was performed in 447 patients suspected to have supraventricular tachycardias ...
Klug Didier - - 2003
Transvenous pacing has become widespread in the pediatric population, but related pacemaker lead infection in young patients has rarely been reported. To determine prevalence and optimal management of pacemaker lead infection in children and young adults, the authors reviewed their pacing database including 4476 patients who previously had pacemaker implantations ...
Kurup Rave Kumar - - 2003
The isoprenoid pathway including endogenous digoxin was assessed in Creutzfeldt-Jakob Disease (CJD). This was also studied for comparison in patients with right hemispheric and left hemispheric dominance. The isoprenoid pathway was upregulated with increased digoxin synthesis in patients with CJD and in those with right hemispheric chemical dominance. In this ...
Mansour Moussa - - 2003
It has been reported that conduction over the fast and slow pathways of the AV node can occur simultaneously, leading to a double ventricular response from each atrial beat. We report the cases of two patients referred to us for evaluation of symptomatic, incessant, and irregular narrow-complex tachycardia, misdiagnosed as ...
Al-Araji Adnan H - - 2003
Multiple sclerosis (MS) is a demyelinating disorder of the central nervous system. Autonomic dysfunction in MS patients may cause significant morbidity. The aim of this controlled cross sectional study was to investigate the prevalence, pattern and severity of autonomic dysfunction in Iraqi MS patients and to correlate them with patient`s ...
Timmenga Nicolaas M - - 2003
Although augmentation of the maxillary sinus floor with autogenous bone grafts has become a well established preimplantology procedure, its effect on the function of the maxillary sinus has not been the subject of prospective human studies. In this prospective study the effects of sinus floor augmentation on maxillary sinus performance ...
Weng Ken-Pen - - 2003
The characteristics of multiple accessory pathways in children have not been previously studied. Records were reviewed of 317 consecutive pediatric patients with Wolff-Parkinson-White syndrome who underwent electrophysiologic study and radiofrequency catheter ablation at our institution. Twenty-eight patients (9%) had multiple pathways (a total of 64 pathways: 21 patients had 2, ...
Garg Naveen - - 2003
BACKGROUND: Dextrocardia is associated with multiple and complex congenital cardiac anomalies. Precise anatomical diagnosis is essential for successful surgery. Spectrum of congenital malformations in cases of dextrocardia is based primarily on two-dimensional echocardiographic studies. The purpose of the current study was to use colour Doppler echocardiography in large number of ...
Frogoudaki A - - 2003
AIM: Left atrial isomerism (LAI) is an uncommon congenital heart disease, which is combined with a range of intracardiac abnormalities. Atrial arrhythmia is common in LAI. We hypothesized that permanent pacing will decrease arrhythmia recurrence in adult patients with LAI. METHODS AND RESULTS: Patients with LAI and permanent pacing were ...
Nürnberg J-H - - 2003
AIMS: The purpose of this study was to reevaluate whether St Jude Medical's Autocapture algorithm (AC) with beat-to-beat capture confirmation, automatic pacing threshold determination and output adjustment can be applied to paced patients with congenital heart disease (CHD). METHODS AND RESULTS: 30 patients with CHD received a transvenous (group A: ...
Spaans Frank - - 2003
In nine patients with Guillain-Barré syndrome (GBS), stimulation single-fiber electromyography (SFEMG) and serological studies were performed in the acute stage of the illness. Increased jitter and intermittent blocking of muscle fiber action potentials occurred to a varying degree in all patients. Five patients had elevated titers of antiganglioside antibodies. The ...
Strohmer Bernhard - - 2003
BACKGROUND: The study tests the hypothesis that ablating all inputs to the atrioventricular (AV) node can result in complete heart block with stable junctional escape rhythm. METHODS AND RESULTS: We attempted atrionodal input ablation in 76 consecutive patients with uncontrolled atrial fibrillation. Fast and slow pathways were first ablated. If ...
Fassoulaki A - - 2003
Methods of sensory testing in neuraxial anesthesia may supposedly account for different results in reporting the extent of the block. To determine whether the caudad to cephalad versus the cephalad to caudad direction as well as the side of testing, left versus right, may affect the assessment of sensory block ...
< 6 7 8 9 10 11 12 13 14 15 16 >