Search Results
Results 751 - 800 of 1286
< 11 12 13 14 15 16 17 18 19 20 21 >
Lin L J - - 1998
In order to assess the incidence of significant venous thrombosis after transvenous permanent pacemaker implantation, transcutaneous ultrasound studies were performed in 109 consecutive patients with single-polyurethane-lead pacemakers. Ultrasonic evaluation was found to be a good noninvasive method in assessing the veins. Six patients (5.5%) were found to have significant venous ...
Ceriani F - - 1998
We report the case of an 84-year-old lady who, after a right temporo-parietal infarction, complained of seeing things smaller than she expected. She also related that straight lines appeared distorted and described seeing colours as if they were a badly mixed assemblage of hues. Her visual field was normal except ...
McGrouther D A - - 1998
A pilot study was performed to demonstrate the involvement of the epidermal innervation in cutaneous neurogenic inflammation following injury or skin incision. Scratching human skin is known to evoke an inflammatory reaction dependent in part on sensory nerves (neurogenic inflammation) in the dermis. Human breast skin from four patients was ...
Stafford B J - - 1998
Carpal morphology and development in bats, colugos, tree shrews, murids, and sciurids were studied in order to homologize carpal elements. Prenatal coalescence of discrete cartilaginous templates with a loss of a center of ossification appears to be the most common method of reducing carpal elements in these mammals. Only bats ...
Mattke S - - 1997
We developed criteria for implantation and programming of permanent endocardial pacemakers in patients with a nonthoracotomy ICD system. These criteria were prospectively used in 10 patients who recieved an ICD prior to (n = 5) or following (n = 5) implantation of a dual chamber (n = 6) or ventricular ...
Sadoul N - - 1997
The objective of this study was to assess the effects of radiofrequency energy application on implanted pacemaker functions. Radiofrequency (RF) catheter ablation may cause pacemaker dysfunction due to electromagnetic interferences. The effects of RF on pacemaker behavior were studied in a series of 38 pacemakers, implanted 18 +/- 26 months ...
Mosseri M - - 1997
BACKGROUND: The cause of severe cardiac conduction disturbances is often uncertain. The aim of this study was to examine a group of patients with permanent pacemakers who underwent coronary arteriography to determine the extent of coronary atherosclerotic disease that might be responsible for the conduction disturbances. METHODS AND RESULTS: Forty-three ...
Unverdorben M - - 1997
In a patient with proven myocardial infarction, coronary artery disease was excluded angiographically. Four weeks later the patient experienced recurrent syncope of unknown cause. By means of Holter monitoring, ST-segment elevation with subsequent first-degree AV block progressing to asystole and resulting in loss of consciousness were documented. Treatment with gallopamil ...
Johnsrude C L - - 1997
Postoperative bradycardia is not uncommon following the Fontan procedure in patients with a functional single ventricle. The surgical connections created with various Fontan modifications may complicate access to the atria for transvenous implantation of a permanent pacemaker. We describe approaches to overcoming problems with atrial access in an adolescent with ...
Ohtsuka T - - 1997
BACKGROUND: Thoracoscopic internal mammary artery (IMA) harvest is technically demanding, particularly on the left side. We have devised a Harmonic Scalpel (Ethicon Endo-Surgery, Cincinnati, OH) technique to facilitate this procedure, and describe our clinical experience here. METHODS: The Harmonic Scalpel functions with ultrasonic energy, producing less smoke and lower heat ...
Antonelli D - - 1997
A 35-year-old patient underwent permanent pacemaker implantation because of symptomatic sinus bradycardia. During the procedure, persistent left superior vena cava was found. The ventricular lead crossed the tricuspid valve only after curving the stylet to form a loop in the right atrium (RA); subsequently, the curved stylet was changed to ...
Takauchi Y - - 1997
This study describes a high-performance liquid chromatographic method with electrochemical detection (HPLC-ED) for monitoring dihydroxyphenylglycol (DHPG) in the myocardial interstitial space. Using a cardiac dialysis technique, 10-microl dialysates were sampled from the myocardial interstitial space (1-min fractions) and were injected directly into the HPLC-ED system. The in vitro quantification limit ...
Zachara E - - 1997
OBJECTIVE: A familial case of restrictive cardiomyopathy due to desmin accumulation characterized by severe disturbances of cardiac conduction is described. BACKGROUND: Desmin is an intermediate filament normally present in the myocardium, particularly in the Purkinje fibres, in the skeletal and in the smooth muscle. METHODS: Resting electrocardiogram, 2-dimensional and Doppler ...
Barold S S - - 1997
During dual chamber pacing, repetitive ventriculoatrial (VA) synchrony secondary to retrograde conduction can occur whenever otherwise effectual atrial stimuli fall continually within the atrial myocardial refractory period generated by preceding unsensed retrograde atrial depolarization. The latter falls within the pacemaker atrial refractory period and cannot initiate endless loop tachycardia, another ...
Lammers W J - - 1997
OBJECTIVE AND DESIGN: The normal aborad propagation of the slow wave in the small intestine is easily distorted by pacing, hypoxia or transection. We studied whether acute local ischaemia would also induce serious conduction disturbances and ectopic pacemaking. METHODS: After general anaesthesia and a mid-abdominal incision, a multi-electrode array of ...
Wei H - - 1997
A recently developed adiabatic coherent polarization transfer enhancement technique [H. Merkle, H. Wei, M. Garwood, K. U─čurbil. J. Magn. Reson, 99, 480-494 (1992)] was employed to perform 13C spectroscopy in the intact canine heart in vivo during [2-13C]-acetate infusion into the left descending coronary artery, the results were compared with ...
Tanaka Y - - 1997
To investigate changes in the radiographic appearance during weightbearing in hallux valgus and to examine the importance of a weightbearing view, a comparative study was performed of accurate dorsoplantar radiographs of 108 symptomatic hallux valgus feet in 73 female patients and 100 normal feet in 69 females, which were taken ...
Santucci P A - - 1997
Previous reports have described the occurrence of ventricular output failure in a permanent DDD pacemaker system related to an increase in the atrial output in the presence of low atrial lead impedance (Medtronic Synergyst/Synergyst II). This phenomenon is seen exclusively following atrial paced events, and may potentially lead to significant ...
Sutton R - - 1997
The economics of treating vasovagal syncope depends on the severity of attacks. In patients with syncope without warning in whom injury is a consideration, a correctly chosen cardiac pacemaker may be warranted. Based on a recent appraisal of the cost effectiveness of dual versus single chamber pacing, it is possible ...
Johnson L L - - 1997
The purpose of this study was to establish the incidence of the anatomic structure, the popliteal bursa, in patients undergoing arthroscopy and to determine the relationship to associated clinical and pathological factors. Diagnostic arthroscopy was used to identify the presence of the popliteal bursa in 187 consecutive patients (195 knees). ...
Detilleux J C - - 1997
A linear model was used to estimate the effects of left displaced abomasum on 57,383 test day milk yields collected between January 1, 1992 and December 31, 1993 in New York State from 12,572 Holstein cows in parity < or = 6. Twenty-five index categories were created to differentiate among ...
Kobayashi M - - 1996
This paper deals with the in vitro evaluation of a newly developed linear motor-driven total artificial heart (linear TAH). The linear TAHs have been developed and evaluated in mock testing and acute animal experiments. The new linear TAH was made based on experience with acute animal experiments. The maximum static ...
Castro A - - 1996
As intracardiac signal amplitudes fluctuate due to patient activity, drug intake, and other factors, it is imperative that an adequate sensing safety margin in an implanted pacemaker be used to compensate. We studied an investigational autosensing feature that automatically adjusts the device's sensitivity. Data were collected from 55 patients, with ...
Kirkegaard-Nielsen H - - 1996
BACKGROUND: Double burst stimulation (DBS) was originally introduced for improved manual detection of residual neuromuscular blockade. Previous studies demonstrated a high correlation between mechanomyographical responses to DBS and train-of-four (TOF) stimulation during recovery from neuromuscular blockade. However, repeatability and bias analyses that are recommended when new monitoring devices are introduced ...
Kawanishi D T - - 1996
Formal Monitoring of Performance is Still Needed. In order to detect trends in the number of device or component failures that have occurred among permanent pacemaker systems since the 1970s, we reviewed the data of the five largest pacemaker manufacturers from the Bilitch Registry of permanent pacemaker pulse generators, the ...
Machado C - - 1996
Many pacemaker patients have vague symptoms following implantation. It is often difficult for the physician to ascertain if they are cardiac in origin. A new pacemaker feature has been introduced, Patient-Triggered Event Records (PTER), to help the physician with this diagnosis. The PTER is a continuously running event record which ...
Chen W H - - 1996
BACKGROUND AND HYPOTHESIS: Occasional reports have suggested that cellular phones may interfere with permanent pacemakers. Our investigation sought to determine systematically the effects of commercially available cellular phones on the performances of different pacing modes and sensing lead configurations of permanent implanted pacemakers. METHODS: We conducted the study in 29 ...
Tellini L - - 1996
This study attempts to improve cardiac pacing by utilizing a new strategy based on integrative rather than substitutive stimulation. This type of cardiac stimulation does not compete with the sinoatrial oscillator and can position the stimulated beat at the expected time. This can be achieved by locking the pacemaker's escape ...
Wilke A - - 1996
The widespread use of cellular phones in the last years has prompted some recent studies to suggest an interference of pacemaker function by cellular phone usage. To determine the risk of pacemaker patients using D-net cellular phones, we tested 50 patients with permanent pacemakers after routine pacemaker check by short ...
Sparks P B - - 1996
In vitro tests suggest that rate adaptive pacemakers using changes in transthoracic impedance to vary pacing rate may be affected by digital mobile telephones. Electromagnetic fields generated by digital mobile telephones (Global System for Mobile [GSM]) represent a potential source of electromagnetic interference (EMI) for the Telectronics META rate adaptive ...
Shen W K - - 1996
BACKGROUND: The number of very elderly persons who are candidates for implantation of a permanent pacemaker is increasing, but the effect of cardiac pacing on long-term survival and functional variables has not been determined. OBJECTIVE: To determine long-term survival after implantation of a permanent pacemaker in octogenarians and nonagenarians and ...
Møller M - - 1996
The Danish Pacemaker Register was established in January 1982, and the 11 implanting centers in Denmark report to the Register on a continuous basis by use of the European Pacemaker Patient Identification Card proposed by the European Working Group on Cardiac Pacing. As of May 1994, the Register contained data ...
Jin Y T - - 1996
Previous studies indicated that Taiwan betel quid is a promoter rather than an initiator during the carcinogenesis of hamster buccal pouch carcinoma. The maximum promoting activity can be demonstrated 24 weeks after betel quid implantation, following an initial application of 0.5% DMBA (7,12-dimethyl benzanthracene) three times per week for 4 ...
Alt E - - 1996
Ventricular arrhythmias during a pacemaker follow-up have been previously reported, usually in conjunction with temporary asynchronous stimulation of a demand pacemaker through magnet application or by increased myocardial excitability, for example, following a myocardial infarction. The subject of this report, an 82-year-old pacemaker patient, had been VVI-paced without problems for ...
Aggarwal A - - 1996
Arrhythmias and pacemaker malfunction are known to occur from the use of an electrosurgical device. The present case report describes a patient with sick sinus syndrome who experienced ventricular fibrillation while undergoing surgery. During replacement of his non-functioning cardiac pacemaker under general anesthesia, electrosurgery was used to ensure hemostasis. Electric ...
Lau C - - 1996
OBJECTIVE: A prospective evaluation of patients with AV block using a single pass lead, VDD pacing system. DESIGN: Fifteen patients with AV block, eight males, seven females, average age 68.1 years (range 22.3 to 86.5) were implanted with the THERA VDD 8948 pacemaker and 5032 single pass steroid eluting lead ...
Ferris C F - - 1996
Golden hamsters start displaying flank marking behavior (a form of scent marking) around postnatal day 20 (P-20). Because the behavior is dependent upon the central activity of arginine vasopressin (AVP), the present study was conducted to correlate this activation with changes in the vasopressinergic system. A first set of experiments ...
Güldal M - - 1996
This article describes a patient who underwent right ventricular disconnection for medically refractory ventricular tachycardia associated with arrhythmogenic right ventricular dysplasia. After the operation there was no ventricular tachycardia recurrence. Two years after the operation, he received a permanent VVI pacemaker for the symptomatic second-degree AV block. Sensing function of ...
Raghavan C - - 1996
Transvenous pacemaker lead malposition in the left ventricle occurs rarely and requires a high index of suspicion for proper diagnosis. The case of a woman with unintentional lead placement in the left ventricle is presented. She had two episodes of transient neurologic deficits, possible secondary to embolic events, and was ...
Oriowo M A - - 1996
The stimulation by BRL 37344 of lipolysis in rat adipose tissues, and of relaxation of the rat distal colon, is mediated by the beta-3 adrenoceptor. The stereochemical requirements of the beta-3 adrenoceptor are poorly understood. The activities of the four stereoisomers of BRL 37344 (i.e., two pairs of diastereoisomers) on ...
Sala A - - 1996
Morphological and functional modifications occurring in Langendorff rabbit heart preparations perfused with purified human leukocytes (PMNL), as an organ model of sulfidopeptide-leukotrienes (sLT) transcellular biosynthesis, were studied. Coronary perfusion pressure (CPP), monitored as an index of coronary vasospasm, increased by 295% after challenge with the Ca(2+)-ionophore A-23187 (0.5 micromol/L) for ...
Miller G L - - 1996
This is the first reported case of cardiac tamponade presumed to be caused by postpericardiotomy syndrome (PPS) following endocardial pacemaker placement. An 84-year-old woman developed fever and dyspnea 3 weeks after pacemaker placement. Physical examination revealed hypotension, tachycardia, and pulsus paradoxus. Auscultation revealed clear lungs and diminished heart sounds. The ...
Doherty J G - - 1996
A seventy year old woman had a permanent VVI pacemaker inserted in 1983 for complete heart block and presented ten years later with purulent discharge from the generator pocket. During a prolonged pyrexial illness, she developed renal and respiratory failure and her illness was complicated by recurrent ventricular fibrillation. The ...
Haffajee C - - 1996
As implantable cardioverter defibrillators (ICDs) are strictly contraindicated in the presence of unipolar pacemakers, currently available options in patients having such chronic pacing systems include: abandoning the implanted pacemaker and selecting an ICD with ventricular demand (VVI) pacing; or replacing the chronic (dual chamber) unipolar pacing system with a dedicated ...
Chalana V - - 1996
Tracing of left-ventricular epicardial and endocardial borders on echocardiographic sequences is essential for quantification of cardiac function. The authors designed a method based on an extension of active contour models to detect both epicardial and endocardial borders on short-axis cardiac sequences spanning the entire cardiac cycle. They validated the results ...
Seo K - - 1996
Indirect inhibition of an external temporary pacemaker by electrocautery is reported. Before induction of general anesthesia for a hemimaxillectomy and radical neck dissection, a temporary transvenous demand pacemaker was inserted into a patient with a first-degree atrioventricular block and complete left bundle-branch block. Although we provided common precautions to prevent ...
Vanderheyden M - - 1996
The search for a pacemaker that accurately and easily mimics normal physiology is a continuing effort. Present pacing developments include AV synchrony and rate adaptiveness. The usefulness and clinical value of some of the new pacing systems remain unclear. Although the hemodynamic advantages of rate responsive pacing over classical ventricular ...
Shay S S - - 1996
OBJECTIVE: To examine the influence of three postures (upright and left and right recumbent) on gastroesophageal reflux event (RE) frequency and composition and a possible mechanism for the observations. METHODS: A) Forty fasting patients with (E+, n = 20) and without (E-, n =20) esophagitis were studied. Simultaneous manometry and ...
Kolker A R - - 1996
OBJECTIVE: The comparative safety of central venous puncture versus cutdown technique for access to the right heart. EXPERIMENTAL DESIGN: A retrospective review of five hundred and fifty-five single and dual chamber permanent pacemaker implants performed between January of 1987 and December of 1993. SETTING: Review was performed at St. Vincent's ...
Henderson D - - 1995
A 79-year-old patient with a permanent DDD pacemaker due to a complete AV block and severe bradycardia was seen with complaints of syncope. A surface ECG rhythm strip verified the loss of ventricular output with 6-second periods of asystole. Subsequent investigation using the pacemaker's annotated event markers and multiple polarity ...
< 11 12 13 14 15 16 17 18 19 20 21 >