Search Results
Results 551 - 600 of 1641
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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 ...
Elefteriades John A - - 2002
The authors have previously shown that conditioning of the diaphragm for continuous bilateral pacing is a feasible and effective means of ventilation in patients with complete respiratory paralysis from high cervical (above C3) quadriplegia. The present study reports the long-term results of continuous diaphragmatic pacing. Twelve quadriplegia patients underwent bilateral ...
Schuchert Andreas - - 2002
BACKGROUND: It is generally acknowledged that pacemaker output must be adjusted with a 100% voltage safety margin above the pacing threshold to avoid ineffective pacing, especially in patients dependent on pacemakers. AIMS: The aim of this prospective crossover study was to assess the beat-to-beat safety of low outputs in patients ...
Faddis Mitchell N - - 2002
There is a high prevalence of cardiovascular disorders among elderly patients with recurrent falls or syncope, and cardiovascular causes are implicated in a significant proportion of three cases. Common cardiovascular causes of falls and syncope include carotid sinus syndrome, vasovagal episodes, sick sinus syndrome, and atrioventricular block. A comprehensive history ...
Kurup Ravi Kumar - - 2002
The isoprenoid pathway produces three key metabolites--digoxin (membrane Na(+)-K+ ATPase inhibitor, regulator of neurotransmitter transport, and immunomodulatory agent), dolichol (regulatory of N-glycosylation of proteins), and ubiquinone (free-radical scavenger). The pathway was assessed in systemic lupus erythematosis with neuropsychiatric manifestations, slow viral diseases (subacute sclerosing panencephalitis [SSPE], and Creutzfeldt-Jakob disease [CJD]) ...
Alakhras Mazen - - 2002
We describe a patient with bifascicular block, who developed transient high-degree atrioventricular block during dipyridamole infusion. This patient was subsequently found to have significant His-Purkinje disease at electrophysiology study, and underwent permanent pacemaker implantation. Spontaneous atrioventricular block was documented during follow-up. This case report raises the issue of dipyridamole safety ...
Yao Chih-Ta - - 2002
Congenital long QT syndrome (LQTS) with atrioventricular block is a rare and malignant arrhythmia, which usually responds poorly to traditional beta-blocker therapy. We describe a male neonate with LQTS with ventricular tachycardia and 2:1 atrioventricular block. This patient's sister had similar presentation and died suddenly at the age of 8 ...
Antz Matthias - - 2002
INTRODUCTION: Cardiac arrest in patients with Wolff-Parkinson-White (WPW) syndrome can be due to ventricular fibrillation mediated by fast conduction over the accessory pathway during atrial fibrillation. However, if primary ventricular fibrillation is the reason for resuscitation, placement of an implantable cardioverter defibrillator (ICD) would be indicated. The aim of this ...
Singer Wolfgang W Department of Neurology, Mayo Clinic, Rochester, Minn 55905, - - 2002
To determine whether an intrinsic sinus node abnormality is involved in the pathophysiology of the postural tachycardia syndrome (POTS). SUBJECTS, PATIENTS, AND METHODS: In this prospective study, we compared the relationship between P-wave axis (PWA) and heart rate (HR) in 11 healthy controls and 14 patients with POTS by obtaining ...
Chang Michael - - 2002
A patient with a port-a-cath was given 12 mg of adenosine for paroxysmal supraventricular tachycardia (PSVT), resulting in prolonged (13 s) bradycardia and severe side effects. When the same patient presented 2 weeks later for recurrent PSVT, only 3 mg of adenosine was needed to terminate the episode, without the ...
Hussain A - - 2002
OBJECTIVE: To determine the frequency of post-operative conduction abnormalities in Pakistani patients undergoing total correction for Fallot's Tetralogy. PATIENTS AND METHODS: One hundred and fifteen patients of Fallot's Tetralogy underwent definitive repair between January, 1999 and April, 2000. Their mean age was 12.89 years (range 3-30 years). One hundred nine ...
Wallbrück K - - 2002
A clinical study investigates the use of Home Monitoring (HM) in pacemaker therapy. For 3 months patients are supervised by daily automatic HM messages. Endpoints are the technical feasibility and the clinical benefit of HM. Ninety three patients have currently been included and followed for 72 +/- 30 days. Three ...
Diakomanolis Emmanuel - - 2002
To assess the effectiveness of laser ablation and upper vaginectomy in the treatment of vaginal intraepithelial neoplasia (VAIN), we have reviewed the charts of 52 patients managed with laser ablation (28 patients) and upper colpectomy (24 patients). On the basis of our results, patient selection and operator skill have a ...
Uemura A - - 2001
In patients with primary atrioventricular (AV) conduction disturbances, lesions are commonly believed to be limited to the conduction system. In the present study, myocardial lesions were analyzed histologically in patients with AV conduction disturbances to determine the presence of myocarditis. We studied 50 patients with second or third degree AV ...
Kenny R A - - 2001
OBJECTIVES: The aim of the study was to determine whether cardiac pacing reduces falls in older adults with cardioinhibitory carotid sinus hypersensitivity (CSH). BACKGROUND: Cardioinhibitory carotid sinus syndrome causes syncope, and symptoms respond to cardiac pacing. There is circumstantial evidence for an association between falls and the syndrome. METHODS: A ...
Erdogan O - - 2001
This report describes an asymptomatic patient with a DDDR pacemaker system (Inos Cls, Biotronik) that showed intermittent mode reversion to VOO and sometimes to VVI without a detectable source of electromagnetic interference and oversensing. Patients with this Biotronik model should be carefully assessed along with a surface ECG before placing ...
Brignole M - - 2001
BACKGROUND: In patients with syncope and bundle branch block (BBB), syncope is suspected to be attributable to a paroxysmal atrioventricular (AV) block, but little is known of its mechanism when electrophysiological study is negative. METHODS AND RESULTS: We applied an implantable loop recorder in 52 patients with BBB and negative ...
Liu S - - 2001
The objective of this study was to delineate the sex distribution and atrioventricular conduction properties in patients with manifest or concealed Wolff-Parkinson-White syndrome (WPW) and atrioventricular nodal reentrant tachycardia (AVNRT). The study comprised 328 patients with AVNRT, 347 with manifest, and 220 with concealed WPW who underwent radiofrequency ablation. A ...
Weismüller P - - 2001
BACKGROUND: Patients with more than one AV nodal pathway show two and more peaks in the histogram of the R-R intervals of the Holter monitoring ECG during atrial fibrillation. It was the purpose of the present study to determine the number of patients showing more than one AV nodal pathway ...
Baker J - - 2001
Care paths and patient pathways are collaborative interdisciplinary tools developed to provide quality care. One goal in progressive renal insufficiency (PRI) care is to provide patients and family members with relevant and timely information to help them cope with medical therapy and lifestyle changes required to slow the progression of ...
Liu S - - 2001
The relation between the atrioventricular conduction properties of the atrioventricular node and the anterograde conduction ability over the accessory pathway in the Wolff-Parkinson-White syndrome has never been studied. Atrioventricular nodal characteristics were studied in 285 patients with manifest and 204 with concealed accessory pathway who underwent radiofrequency ablation, and compared ...
Wiegand U K - - 2001
Unipolar ventricular leads were implanted in a considerable percentage of pacemaker recipients. There is little information on incidence and risk factors for unipolar pacemaker dysfunction using modern lead designs. Included in a cross-sectional analysis were 682 patients who fulfilled the following criteria: chronically implanted bipolar ventricular leads (> 1 year), ...
Kriatselis H D - - 2001
The short- and long-term effect of radiofrequency (RF) modification of the AV junction on ventricular rate and left ventricular function and the different types of ventricular response during energy application under autonomic nervous blockade were assessed in 28 patients with medically refractory atrial fibrillation. During the successful RF application, ventricular ...
De Groot N M - - 2001
Voltage differences might be used to distinguish normal atrial tissue from abnormal atrial tissue. This study was aimed at identifying lowest voltage areas in patients with atrial tachycardia after surgical correction of congenital heart disease and to evaluate if identification of these areas in diseased hearts facilitates selection of critical ...
Schuchert A - - 2001
The programmability of cardiac pacemakers enables the physician at follow-up to adjust the pacing pulse under consideration of the 100% safety margin with respect to the individual pacing threshold. The purpose of reducing the output is to prolong pacemaker longevity. The aims of this prospective, randomized trial were to compare ...
Christini D J - - 2001
In vitro experiments have shown that the complexity of atrioventricular nodal (AVN) conduction dynamics increases with heart rate. Although complex AVN dynamics (e.g., alternans) have been observed clinically, human AVN dynamics during rapid pacing have not been systematically investigated. We studied such dynamics during ventricular-triggered atrial pacing in 37 patients ...
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