Search Results
Results 601 - 650 of 1642
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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 ...
D'Este D - - 2001
AIMS: The purpose of this study was to investigate the relationship between the incidence of dual atrioventricular (AV) nodal pathways and age. Age-related changes in the AV node electrophysiological properties have rarely been investigated. AV nodal re-entrant tachycardia is more frequent in the young than in the elderly. METHODS AND ...
Oomman A - - 2001
OBJECTIVE: Surgery has been the only therapeutic option in patients with hypertrophic obstructive cardiomyopathy (HOCM) who are resistant to standard treatment. Percutaneous transluminal septal myocardial ablation (PTSMA) by alcohol-induced occlusion of the septal artery for the reduction of left ventricular outflow tract (LVOT) gradient is a novel method. However, long-term ...
Tobias J D - - 2001
Patients receiving anticonvulsants such as phenytoin or carbamazepine may be resistant to neuromuscular blocking agents. The authors report the response to rapacuronium bromide (1.5 mg/kg) in two adult patients; one receiving phenytoin and the other receiving carbamazepine. In both patients, there was a delay in achieving maximum blockade; 100% depression ...
Tang A S - - 2001
BACKGROUND: A recently completed trial, the Canadian Trial of Physiological Pacing (CTOPP), showed that physiological pacing did not significantly reduce mortality, stroke, or heart failure hospitalization, but it did show that atrial fibrillation occurred less frequently in patients with physiological pacing. Many pacemaker patients experience only transient bradyarrhythmias with an ...
Rokas S - - 2001
BACKGROUND: This study evaluates the role of RR interval distribution pattern as an outcome predictor of radiofrequency (RF) modification of atrioventricular (AV) node in chronic atrial fibrillation (AF) and attempts to elucidate the likely mechanism of rate control. METHODS AND RESULTS: Sixty-five patients with chronic AF underwent AV node modification. ...
Graux P - - 2001
While carotid sinus syndrome (CSS) is often suspected as a cause of syncope in the elderly, whether it represents an indication for cardiac pacing may remain uncertain. Bradycardia algorithms included in pacemakers are now able to establish a precise relationship between spontaneous asystole and occurrence of symptoms and strengthen the ...
Annesley-Williams D J - - 2001
The purpose of the study was to assess the cure rate in patients with indirect carotico-cavernous fistula (CCF) treated by transvenous embolisation via the inferior petrosal sinus (IPS) pathway or the superior ophthalmic vein (SOV). Twelve fistulae in 11 patients were treated by transvenous embolisation, eight patients via the IPS ...
Kato I - - 2001
In six patients with chronic bradydysrhythmias, polysomnographies were performed before cardiac pacemaker implantation and over the week following implantation. A patient with third-degree atrioventricular block (AVB) and two patients with sinus node dysfunction (SND) were associated with sleep-disordered breathing (SDB). Their cardiac pacemaker therapies, with the increase in the average ...
Chiu C C - - 2001
The use of the implanted atrial-based pacemaker to overdrive postsurgical intraatrial reentry tachycardia (IART) was evaluated in a large group of pediatric patients over a 14-year study period. The authors sought to determine the feasibility of this noninvasive technique in the management of this specialized population and to determine factors ...
Cohen M I - - 2001
OBJECTIVES: There is an increasing incidence of sinus node dysfunction after the Fontan procedure. Inability to maintain atrioventricular synchrony after the Fontan operation has been associated with an adverse late outcome. Although pacing may be helpful as a primary or adjunct modality after the Fontan procedure, the effects of performing ...
Mak P H - - 2001
Thirty unpremedicated ASA physical status 1-3 patients aged between 18 and 69 years, scheduled for upper limb surgery, received a conventional supraclavicular brachial plexus block using a nerve stimulator and bupivacaine 0.375% 0.5 ml.kg-1. Spirometric measurements of pulmonary function and ultrasonographic assessments of diaphragmatic function were made before the block ...
Gill K S - - 2001
We have described a patient who developed a small submitral pseudoaneurysm of the left ventricle during electrophysiologic mapping aimed at ablating a concealed accessory pathway. The patient was asymptomatic, and the lesion was detected on a routine postprocedure echocardiographic study. Spontaneous healing occurred, and the lesion was no longer seen ...
Kristensen L - - 2001
This retrospective study included a large cohort of consecutive patients primarily implanted at Skejby University Hospital with an AAI/AAIR pacemaker because of sick sinus syndrome (SSS) from July 1981 to July 1999. The primary aim of the study was to analyze the risk of developing AV block during long-term follow-up. ...
Yamamoto T - - 2001
Persistent perineal sinus is a common and serious cause of morbidity after proctectomy for Crohn's disease. Recently we have performed excision and omentoplasty on 6 patients with persistent perineal sinus. The perineal sinus was completely excised and communication was established with the pelvis. In 4 patients, the left gastroepiploic vessels ...
Boissel N - - 2001
Phrenic pacing can restore diaphragmatic contractions in patients with central respiratory paralysis. It relies on radiofrequency transmission of energy from an external unit to implanted receivers through circular coil antennas. The case of a patient is reported in whom severe hypoventilation occurred following the use of a metallic rescue blanket. ...
Pelargonio G - - 2001
INTRODUCTION: There are few data regarding the occurrence of delayed heart block at least 24 hours after radiofrequency catheter ablation (RFCA) of AV nodal reentry or posteroseptal accessory pathways (APs). We investigated the late occurrence of heart block in this population, the clinical outcome, and whether findings at electrophysiologic study ...
Lipscomb K J - - 2001
OBJECTIVE: To examine the cycle length of the junctional tachycardia often seen during successful slow pathway ablation for atrioventricular (AV) node re-entrant tachycardia, to determine whether shorter cycle lengths predict imminent atrioventricular block. DESIGN: Retrospective analysis of consecutive patients undergoing slow pathway modification. Intracardiac recordings were analysed after digital storage ...
Luria D M - - 2000
This study assessed antidromic reciprocating tachycardia (ART) in patients with paraseptal accessory pathways (APs). Previous clinical experience suggests that paraseptal APs are unable to serve as the anterograde limb during ART. Based on the reentry wavelength concept, we hypothesized that anatomic location of a paraseptal AP may not preclude occurrence ...
Skanes A C - - 2000
BACKGROUND: We report the first successful slow pathway ablation using a novel catheter-based cryothermal technology for the elimination of atrioventricular nodal reentrant tachycardia (AVNRT). METHODS AND RESULTS: Eighteen patients with typical AVNRT underwent cryoablation. Reversible loss of slow pathway (SP) conduction during cryothermy (ice mapping) was demonstrated in 11 of ...
Hirao K - - 2000
Para-Hisian pacing (PHP), a pacing method to differentiate between conduction occurring over an accessory pathway (AP) from that over the atrioventricular node (AVN), is assessed essentially by comparing the timing in the atrial electrogams. Morphological change in the atrial electrograms is often observed during PHP, but its significance has not ...
Iyer R - - 2000
Radiofrequency (RF) ablation is a new modality of pennanently curing patients with various tachycardias using radiofrequency energy, a technique evolved in the past decade. RF ablation was performed on 913 patients with different tachyarrhythmias from April, 1994 to July, 1999. There were 491 men and 422 females aged 42 +/- ...
Bru P - - 2000
Right atrial isthmus block is currently accepted as a success criterion of atrial flutter ablation. An electrophysiological study performed days after the ablation procedure may show recovery of conduction across the isthmus in some patients, followed by arrhythmia recurrence. However, few data are available on the time course of this ...
Simeon L - - 2000
Automatic adjustment of the stimulation output of pacemakers to changing stimulation thresholds using the Autocapture feature increases patient safety and decreases energy consumption. This study examined the impact of Autocapture on pulse generator longevity in patients with different chronic stimulation thresholds. Eighty patients (mean age 79 +/- 9 years; 37 ...
Weismüller P - - 2000
Two or more peaks on the 24-hour electrocardiogram (ECG) RR interval histogram of patients with atrial fibrillation suggests the presence multiple AV nodal pathways. The prevalence of multiple AV nodal pathways in this population is unknown. The study included 250 patients with permanent atrial fibrillation during 24-hour ECG. The number ...
Kurbaan A S - - 2000
This study examined whether the various hemodynamic collapse patterns observed during tilt testing in patients with suspected neurocardiogenic syncope are relevant when planning therapy, particularly whether a predominantly cardioinhibitory response predicts a beneficial response from pacing. METHODS: The effects of temporary atrioventricular (A-V) sequential pacing were studied during tilt testing ...
Levin R J - - 2000
BACKGROUND: This is a retrospective review of medical and financial records to test the hypothesis that the use of a critical pathway specifically designed for the management of laryngectomy patients will result in improved patient care, decreased length of hospitalization, and optimal allocation of resources. METHODS: Thirty patients undergoing laryngectomy ...
Lazorishinets V V - - 2000
OBJECTIVE: Ebstein's anomaly is the most common pathology associated with the accessory conduction pathways. METHODS: From January 1990 to August 1999 48 patients underwent surgical repair of Ebstein's anomaly by various plastic techniques. The pathways were identified and characterized at preoperative electrophysiologic mapping in 17 (34.5%) patients. There were seven ...
Katoh T - - 2000
In our previous patients, apparent bradycardia-dependent block has been shown in the atrioventricular (AV) junction and in the accessory pathway. It was suggested that these previous cases were not of true bradycardia-dependent block; namely, that, as a result of periodic increases in vagal tone associated with respiration, conductivity in the ...
Suga C - - 2000
BACKGROUND: Indications for extraction of an abandoned pacemaker lead (APL) are controversial. The purpose of this study was to determine whether or not APLs should be extracted in the absence of pacemaker-related problems. METHODS AND RESULTS: We retrospectively reviewed, from 1977 through 1998, all patients with retained, non-functional leads and ...
Lamas G A - - 2000
BACKGROUND: More than 200,000 permanent pacemakers will be implanted in the United States in 2000 at a cost of more than $2 billion. Sick sinus syndrome (SSS) will likely account for approximately half of all cases necessitating implantation. Pacemaker technology permits the selection of ventricular (single-chamber) or dual-chamber devices. However, ...
Sato T - - 2000
Radiofrequency catheter ablation (RFCA) for inappropriate sinus tachycardia (IST) is associated with a high recurrence rate and sometimes requires pacemaker implantation, especially after extensive ablation. We report a patient with drug-refractory IST who was successfully treated by selective RFCA to the 2 earliest activation sites. During tachycardia, the earliest atrial ...
Kayalioglu G - - 2000
Variations of the nasal cavity are very important for the otolaryngologist in functional endoscopic sinus surgery. To provide data on bony variations of this region, we performed high resolution computed tomography images of paranasal sinuses on 82 adult patients without sinus pathology and on 90 adult patients with sinus disease. ...
Mewis C - - 2000
BACKGROUND: Adenosine is widely used as a tool to assess the effectiveness of radiofrequency ablation of concealed accessory pathways. HYPOTHESIS: The goal of this study was to determine the reliability of this test by studying the retrograde fast pathway sensibility in a large patient population with typical atrioventricular (AV) nodal ...
Redfield M M MM Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, MN 55905, - - 2000
To determine the frequency of tachycardia-related cardiomyopathy in patients with atrial fibrillation and systolic dysfunction referred for atrioventricular node ablation. This prospective multicenter cohort study was conducted at 16 tertiary care centers. The ejection fraction was measured before and 3 and 12 months after atrioventricular node ablation. Patients with reduced ...
Siepmann D B - - 2000
STUDY OBJECTIVE: Cost concerns may inhibit emergency medical services (EMS) use. Novel tax-based and subscription prepayment programs indemnify patients against the cost of EMS treatment and transport. We determine whether the presence of (or enrollment in) prepayment plans increase EMS use among patients with acute chest discomfort, particularly those residing ...
Scheinman M M - - 2000
The results of the NASPE Prospective Voluntary Registry are reported. A total of 3,357 patients were entered. For those undergoing atrioventricular (AV) junctional ablation (646 patients), the success rate was 97.4% and significant complications occurred in 5 patients. A total of 1,197 patients underwent AV nodal modification for AV nodal ...
Shah D C - - 2000
OBJECTIVES: We sought to assess the dynamic temporal course of conduction recovery during and after radiofrequency (RF) catheter ablation of the cavotricuspid isthmus. BACKGROUND: Although cavotricuspid isthmus block is accepted as the best end point of ablation for typical flutter, conduction recovery is thought to underlie many eventual recurrences. Its ...
Scheinman Melvin M. - - 2000
This paper reviews three recent large scale studies on the use of catheter ablation for elderly patients with supraventricular tachycardia. These patients underwent catheter ablation of the atrioventricular junction for control of atrial fibrillation, ablation of the slow atrioventricular nodal pathway for those with atrioventricular nodal, reentry tachycardia, and ablation ...
ErtaƟ F - - 2000
Many studies suggest that patients who receive a ventricular pacemaker have a higher incidence of systemic thromboembolism compared to patients receiving a physiological pacemaker. However, the exact mechanism regarding the etiology of thromboembolism remains unclear. We evaluated the left atrial appendage (LAA) functions, using multiplane transesophageal echocardiography (TEE), in patients ...
Exner D V - - 2000
Prior clinical research indicates that conduction slowing is the primary mechanism leading to the spontaneous termination of reentrant tachycardia in humans. Yet, some experimental models indicate that cycle length oscillations and enhanced conduction are important prerequisites. The role of oscillations in conduction times and enhanced conduction in the spontaneous termination ...
Edoute Y - - 2000
Numerous studies have shown a beneficial effect of combination therapy with beta-blockers and calcium antagonists in patients with anginal syndrome and/or hypertension. However, because both agents exert a negative chronotropic effect, their combined use may cause bradyarrhythmias with resultant symptoms of cerebral, coronary, and systemic hypoperfusion. We describe our clinical ...
Yang Y - - 2000
Changes in the retrograde conduction time (ventriculoatrial [VA]) interval during functional bundle branch block (BBB) have been used to separate septal from free wall accessory pathways (APs), but different values of the VA interval prolongation (deltaVA) have been described in different reports. A total of 95 patients with single nondecremental ...
Alfa M J - - 2000
Accessory devices used for gastrointestinal endoscopy are often complex and because they enter sterile body cavities, or contact blood because of invasive procedures, they should be sterile before being used for a patient procedure. The complexity of such reusable accessory devices is reviewed, and the critical aspects of cleaning, sterilization, ...
Belhassen B - - 2000
INTRODUCTION: We recently reported that administration of adenosine triphosphate (ATP) during sinus rhythm identifies dual AV nodal physiology (DAVNP) in 76% of patients with inducible sustained AV nodal reentrant tachycardia (AVNRT) at electrophysiologic (EP) study. In that report, however, the ATP test was considered positive for DAVNP only when the ...
Paparella N - - 2000
Sixty-three patients with paroxysmal supraventricular tachycardia were studied and 25 patients (39%) showed newly acquired negative T waves after tachycardia termination. Silent coronary artery disease could not be found in about 90% of these patients; moreover, age, sex, organic heart disease, and tachycardia duration and rate did not predict the ...
Connors S P - - 2000
Atrial tachycardia (AT) originating in the triangle of Koch is reported rarely and presents a potential risk of atrioventricular (AV) block during radiofrequency (RF) catheter ablation. Eight patients with AT in the triangle of Koch undergoing RF ablation are presented. There were five women and three men, ranging in age ...
Pfeiffer D - - 2000
Radiofrequency catheter ablation is the treatment of choice in atrioventricular nodal reentrant tachycardia. Electrophysiologic investigations in 623 patients revealed eight mechanisms of tachycardia ablation: Ablation of fast (I) or slow (II), modification of fast (III) or slow AV nodal pathways (IV), modification of both pathways (V), ablation of fast and ...
Ando M - - 2000
Cardiac toxicities in 39 consecutive patients with breast cancer receiving high-dose chemotherapy (HDC) with stem cell transplantation were reviewed. All 39 patients received various anthracycline-containing regimens in adjuvant settings and/or for metastatic disease before HDC. As a cytoreductive regimen, all received cyclophosphamide 2000 mg/m2 and thiotepa 200 mg/m2 for 3 ...
Krupa W - - 2000
Permanent cardiac pacing is a widely applied procedure in invasive cardiology. The aim of our study was the analysis of the localisation of the tip of the pacemaker lead and its course in the right ventricle. Research was carried out on a group of 12 patients (5F, 7M), from 40 ...
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