Search Results
Results 601 - 650 of 1716
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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 ...
al-Khadra Ayman S - - 2003
The safety of pacemaker and defibrillator implantations in orally anticoagulated patients using standard techniques has not been thoroughly evaluated. This article describes a prospectively collected experience in such patients. Patients presenting for device implantation who were treated with warfarin were allowed to continue therapy provided that the INR was < ...
Donateo Paolo - - 2003
OBJECTIVES: We prospectively evaluated the mechanism of syncope in patients with positive adenosine triphosphate (ATP) tests (defined as the induction of atrioventricular [AV] block with a ventricular pause >/=6 s after an intravenous bolus of 20 mg ATP). BACKGROUND: Patients with unexplained syncope tend to have more positive ATP tests ...
Ohkusu Yasuo - - 2003
Biventricular pacing has recently been found beneficial in the treatment of congestive heart failure (CHF). Meanwhile, positron emission tomography (PET) has emerged as a new method to analyze glucose metabolism in the heart. Five patients (mean age 68.8 +/- 8.1 years, 4 men) who received biventricular pacing therapy for 5.8 ...
Puskas John D - - 2003
OBJECTIVES: Placement of temporary epicardial pacing wires (PWs) after coronary artery bypass graft (CABG) is routine procedure in many centers, despite infrequent but significant complications, including hemorrhage, tamponade, and death. The resurgence of off-pump CAB (OPCAB) prompted a reexamination of this practice. METHODS: Two hundred unselected coronary patients were prospectively ...
Klingensmith Robert D - - 2003
In this current study, radiographs were taken to determine whether pelvic distortions could be demonstrated on x-ray when pelvic blocks were placed under the patient in the prone position. One patient was placed prone in a neutral position and radiographs were taken in a neutral position, and then with a ...
Greco Oswaldo Tadeu - - 2002
We analyzed performance of a ventricle-paced, ventricle-sensed, inhibited, rate-responsive (VVIR) pacemaker driven by autonomic nervous system activity sensor in chagasic patients with cardiac conduction system disturbances. Forty-seven chagasic patients were studied (28 male, 19 female; age, 24-68 years). Thirty-six patients had complete atrioventricular (AV) block, eight had second-degree AV block, ...
Breur Johannes M P J - - 2002
The aim of this study was to evaluate the effect of pacemaker (PM) therapy in patients with isolated congenital complete atrioventricular block (CCAVB). Patients with CCAVB eventually quality for PM implantation, however, timing remains controversial. Retrospective evaluation of left ventricular end-diastolic diameter (LVEDD), shortening fraction (SF), and cardiothoracic ratio (CTR) ...
Iturralde Pedro - - 2002
Discordant atrioventricular connections associated with Wolff-Parkinson-White syndrome increase the challenge of radiofrequency ablation. We report the results and techniques of radiofrequency ablation in three patients with discordant atrioventricular connections, including one patient having double outlet right ventricle with atrioventricular reentry tachycardias. There were two males and one female, aged 14 ...
Li Yi-Gang - - 2002
INTRODUCTION: His-Purkinje conduction delay, manifested by bundle branch block QRS complex configuration or by HV interval prolongation, is considered an essential condition for maintenance of bundle branch reentrant tachycardia (BBRT). METHODS AND RESULTS: Of 178 patients with different types of ventricular tachycardia (VT), 13 were found to have BBRT as ...
Lazarus Arnaud - - 2002
OBJECTIVES: We hypothesized that pacemaker (PM) implantation in patients with myotonic dystrophy (MD) with a prolonged HV interval, even asymptomatic, may protect them against sudden death related to atrioventricular (AV) block. We sought to prospectively document the true incidence of AV block episodes in this high-risk population and accurately trace, ...
Candinas Reto - - 2002
The Autocapture algorithm enables automatic capture verification on a beat-by-beat basis by recognizing the evoked response signal following each pacemaker stimulus. The algorithm intends to increase patient safety while decreasing energy consumption. However, the occurrence of fusion beats, particularly during dual chamber pacing, may limit the energy saving effect of ...
Madias John E - - 2002
We describe two patients with posterior myocardial infarction (PMI) with unusually atypical clinical presentations and cardiac enzymatic profiles, but with the abrupt development of complete AV block in patient 1, and Mobitz II second-degree AV block with paroxysmal phases of higher degrees of AV block in patient 2, and mitral ...
Pinski Sergio L - - 2002
In the acquired long QT syndrome, torsades de pointes (TP) is invariably preceded by pauses or bradycardia. Thus, it has been proposed that out-of-hospital initiation of drugs that prolong repolarization should be safe in patients with permanent pacemakers. However, a minimal protective pacing rate has not been identified. The authors ...
Koorengevel Kathelijne M - - 2002
The circadian pacemaker is an endogenous clock that regulates oscillations in most physiological and psychological processes with a near 24-h period. In many species, this pacemaker triggers seasonal changes in behavior. The seasonality of symptoms and the efficacy of light therapy suggest involvement of the circadian pacemaker in seasonal affective ...
Kardelen Firat - - 2002
Sinus node dysfunction has been reported rarely in pediatric patients with structurally normal hearts. It has been diagnosed with increasing frequency in children and young adult patients with congenital heart defect, especially in patients who have undergone corrective cardiac surgery related with atrial tissue. Between 1984-1999, 26 patients who were ...
Heinroth K M - - 2002
AIMS: It was the purpose of this study to determine the incidence of more than two AV nodal pathways in patients with AVNRT. METHODS AND RESULTS: In 78 consecutive patients with AV-nodal reentrant tachycardias (AVNRT) (50 females, 28 males, mean age 52.8 +/- 14.6 years), the number of sudden AH ...
Marrouche Nassir F - - 2002
OBJECTIVES: It was the purpose of this study to define the electrophysiologic (EP) identity of left septal atrial tachycardia (AT). BACKGROUND: The clinical and EP characteristics of this particular type of arrhythmia have not been fully described. METHODS: A total of 120 patients with AT underwent invasive EP evaluation. Five ...
Gornick Charles C - - 2002
Unexpected loss of bipolar pacing function can occur in Guidant VIGOR dual chamber pacemakers with QC2 (Quick Connect) headers. In a retrospective review of 305 implanted patients, 23 exhibited unexpected loss of bipolar pacing lead function from < 1 to 51 months postimplant. Atrial lead problems were seen in 17 ...
Erdinler Izzet - - 2002
Vegetative electrode infection following permanent pacemaker implantation is a rare and serious complication. Among 1920 patients who underwent permanent pacemaker implantation in our institute between 1980 and 2000, 7 patients aged 65 to 78 years were diagnosed to have pacemaker related endocarditis. In this study, the clinical course and management ...
Taylor C - - 2002
AIMS: To examine the feasibility of using the ROMEO (rule out myocardial events on "obs" ward) pathway for low risk patients with chest pain in a UK emergency department. METHODS: A prospective study was undertaken to determine outcomes for the first 100 patients entering the pathway (from May to Oct ...
Atiga Walter L - - 2002
In patients with atrial flutter, conventional RF ablation may not result in complete isthmus block. This prospective, randomized study tested the hypothesis that the cooled RF ablation is safe and facilitates the achievement of isthmus block with fewer RF applications than with standard ablation for typical atrial flutter. Isthmus ablation ...
Christ Torsten - - 2002
BACKGROUND: The Inos2 DDDR pacemaker senses unipolar intracardiac impedance signals for adapting heart rate to meet the haemodynamic needs of physical activity. Theoretically, such pacing devices could be limited by positive feedback since increase in beating frequency per se enhances contractility. We have addressed this problem in patients with chronotropic ...
Kafali Gülden - - 2002
We reviewed hospital records of 45 children with corrected transposition of the great arteries (c-TGA) to determine the incidence and outcome of congenital and postoperative dysrhythmias seen in this congenital anomaly. Our study comprised 45 patients (12 girls, 33 boys). The mean age of the patients at initial evaluation was ...
Iturralde Pedro - - 2002
The aim of the study was to review the clinical and electrophysiological characteristics and results of radiofrequency catheter ablation in patients with multiple accessory pathways to compare them with those of patients with single accessory pathways. Electrophysiological study and radiofrequency catheter ablation were performed in 1010 consecutive cases with Wolff ...
Reiffel James A - - 2002
This article reports a new, transient, but identical electrocardiogram presentation in 2 patients at 2 different institutions. While its mechanism is uncertain, analysis by exclusion suggests that a diffusely prolonged but nonhomogenous myocardial refractoriness may have altered both QRS morphology and amplitude and also may have resulted in periods of ...
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