Search Results
Results 551 - 600 of 1158
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Benchimol D - - 2000
BACKGROUND: The number of patients with pacemakers has been increasing and a large number of them will present with chest pain or symptoms suggesting angina pectoris. Myocardial ischemia and presence of coronary artery disease are difficult to detect and assess by noninvasive methods in patients with a pacemaker; the electrocardiogram ...
Arand M - - 2000
In this study, the three-dimensional stabilizing capabilities of the AO-Internal Fixator (IF) and the new Universal Spine System (USS) were investigated. Both devices were tested without and with the cross-link system (IF, IFC, USS, USSC). To determine biomechanical characteristics, a human thoracolumbar spine instability model with resection of the vertebral ...
Markou T - - 2000
Combined intracellular and extracellular recordings from various parts of the isolated dorsal vessel of Tenebrio molitor revealed some of the following electrophysiological properties of the heart and the aorta. (i) The wave of depolarization causing forward pulsation of the dorsal vessel was always transmitted from posterior to anterior, with a ...
Steinberg S D - - 2000
Early dislodgment or malfunction of pacemaker leads can result in significant morbidity and therefore must be corrected promptly. We describe a method of changing pacemaker leads that is atraumatic, maintains central venous access, and eliminates the need for venipuncture. Our technique is simple, highly reproducible, and can be performed with ...
Duru F - - 2000
Continuous monitoring of pacemaker stimulation thresholds and automatic adjustment of pacemaker outputs were among the longstanding goals of the pacing community. The first clinically successful implementation of threshold tracking pacing was the Autocapture feature which has accomplished automatic ventricular capture verification for every single stimulus by monitoring the Evoked Response ...
Chou T M - - 2000
A patient who had undergone bypass surgery 5 yr earlier, including left internal mammary artery (LIMA) grafting to the left anterior descending artery, underwent transvenous dual-chamber permanent pacemaker implantation for persistent advanced atrioventricular block. Intraoperative LIMA graft obstruction occurred, resulting in anterior myocardial infarction that was treated successfully by primary ...
Habicht J M - - 2000
BACKGROUND AND AIM OF THE STUDY: The study aim was to determine the incidence and clinical significance of late cardiac conduction defects (CD) after aortic valve replacement (AVR). METHODS: An analysis was made of 100 consecutive cases after AVR in a prospective outpatient evaluation program. RESULTS: The perioperative (30-day) mortality ...
Barold S S - - 2000
The consequences of a short 160 ms postventricular atrial refractory period (PVARP) were studied in 27 patients with Medtronic Elite series of pacemakers (programmed to the unipolar mode) by using chest wall stimulation and myopotential interference. Because the ventricular refractory period is nonprogrammable at 230 ms, appropriately timed signals produced ...
Sarko J A - - 2000
The emergency physician may be called on at any time to evaluate a patient with a pacemaker. Although current models are very reliable, malfunctions occur. This review discusses the basic components of the antibradycardic pacemaker, which malfunctions can be expected to occur, and how to evaluate an improperly functioning unit. ...
Ayestaran C - - 2000
We report a case of a patient with a history of heart conduction disease, symptom-free and without treatment in the last years, who experienced a severe cardiac complication associated with in vitro fertilization (IVF) with vaginal oocyte retrieval (VOR). Eighty-five minutes after the VOR a severe bradycardia and bradypnea occurred, ...
Buys E M - - 2000
AIM: In patients with and without a permanent pacemaker His bundle ablation was performed for symptomatic drug-refractory atrial fibrillation. This study was performed to examine the complications of temporary pacing in patients without an already implanted pacemaker. METHODS AND RESULTS: Between January 1996 and December 1998, 152 consecutive patients, both ...
Sliz N B NB - - 2000
Pacemakers have been implanted in pediatric patients since the late 1960s. Indications for cardiac pacing in infants and children have evolved to include controlling symptoms as well as providing a life-sustaining cardiac rhythm. Pacemakers have become smaller and able to perform more complex functions. Current pacemakers offer a variety of ...
Basker M R - - 2000
Oesophageal syncope is loss of consciousness on swallowing, which is thought to be associated with an abnormal vagovagal reflex that leads to transient bradycardia. Patients with this potentially lethal condition may present to neurologists, cardiologists or gastroenterologists. It may be associated with cardio-active drug therapy, previous myocardial infarction, or with ...
Hasebe S - - 2000
To try to solve the pathogenesis of severe attic retraction viewed from mastoid condition, we examined the residual soft tissue density (RSTD) in the mastoid by computed tomography (CT) in 85 patients (107 ears) with otitis media with effusion (OME) 3 months after tympanostomy tube insertion or later. The incidence ...
Hayakawa I - - 2000
PURPOSE: The purpose of this study was to examine changes in the masticatory function of complete denture wearers after relining the mandibular denture with a soft liner. MATERIALS AND METHODS: Conventional complete dentures were fabricated for 6 completely edentulous patients. One month after completing adjustments of the dentures, maximum biting ...
Hokkanen J E - - 2000
A simple relationship between the burst length of the trigger neurons of the Crustacea cardiac ganglion and the length of the heartbeat, is shown to lead to chaotic heart rate. Interestingly, the same type of relationship is also capable of generating complex periodic deviations from steady heart rhythm. Real Crustacea ...
Watanabe H - - 2000
A newborn female underwent pacemaker implantation with epicardial pacing leads for the treatment of bradycardia caused by congenital atrioventricular block. At 10 months after pacemaker implantation, she was admitted with congestive heart failure. The epicardial leads were seen to encircle the heart, and myocardial ischemia was suggested. During cardiac catheterization ...
Gershon T - - 2000
Cardiogenic shock is one of the most dramatic presentations in Emergency Medicine and requires rapid and accurate assessment, evaluation, and treatment. The cardiovascular disasters that present with shock include acute myocardial infarction with pump failure, aortic dissection, massive pulmonary emboli, and cardiac tamponade. We report a patient who presented to ...
Walker S - - 2000
We report a 64-year-old man with atrial fibrillation and impaired left ventricular function in whom pacemaker lead manipulation during biatrial pacemaker lead removal and biventricular pacemaker lead insertion caused coronary sinus dissection. After further manipulation of the biventricular pacing lead, the true lumen of the coronary sinus could be entered ...
Appleton R - - 2000
Photosensitivity is reported to occur in approximately 40% of patients with juvenile myoclonic epilepsy. Our experience suggests that the prevalence is higher and may be related to both the duration of intermittent photic stimulation and also the age at which the procedure is undertaken. A two-year retrospective review of all ...
Broadley A J - - 2000
In a patient who sustained sudden collapse, later attributed to pulmonary embolization, an ECG during her evaluation demonstrated sinus tachycardia and stimulus artefacts at a rate of 250 per minute which did not capture the heart. Implanted pacemaker malfunction was considered the cause until a chest X ray showed a ...
Tang C - - 2000
This report describes a 33-year-old patient with arrhythmogenic right ventricular (RV) dysplasia who had a dual chamber pacemaker implanted at age 23 years for drug-induced bradycardia. Pacing was continued after right ventricular free-wall disconnection (RVFWD) at age 24 years. Her pacemaker was not replaced after battery depletion 7 years later. ...
Ortmann C - - 2000
Samples of heart tissue were investigated in two series for the detectability of myocardial necrosis after artificial and natural putrefaction, respectively. In the first series heart tissue with and without infarction was artificially subjected to humid and dry autolysis and putrefaction. In the second investigation heart tissue was obtained from ...
Lecanuet J P - - 2000
Cardiac responses of 36- to 39-week-old (GA) fetuses were tested with a no-delay pulsed stimulation paradigm while exhibiting a low heart rate (HR) variability (the HR pattern recorded when fetuses are in the 1f behavioral state). We examined whether fetuses could discriminate between two low-pitched piano notes, D4 (F(0) = ...
Schuchert A - - 2000
Some newer cardiac pacemakers are able to control the efficacy of the ventricular pacing pulse beat by beat and to adjust the ventricular output to the actual pacing threshold. This capture verification is based on the detection of the ventricular evoked response amplitude, which has to be detected immediately after ...
Esmail M M - - 2000
A 33-year-old primigravida presented at 32 weeks gestation with increasing shortness of breath related to left ventricular failure. She had severe bilateral ventricular dilatation of unknown aetiology. An urgent caesarean section was required when she failed to improve on medical therapy, and for this she requested general anaesthesia. The patient ...
Cuzin B - - 2000
OBJECTIVE: The rise in the number of implantations of cardiac pacemakers is of some concern to decision makers in the health sector. We assessed the intrinsic and relative clinical efficacy of cardiac pacemakers in current clinical indications to find out whether scientific or clinical arguments might justify differences in market ...
Li J H - - 1999
The mean first passage time (MFPT) over the fluctuating potential barrier is investigated in the presence of additive and multiplicative noises. It is shown that the MFPT over the fluctuating potential barrier displays a resonant activation (RA). The effect of the additive and multiplicative noises and the correlation between them ...
Lilienfeld S O - - 1999
Although the construct of psychopathy has received considerable attention in humans, its relevance to other animals is largely unknown. We developed a measure of psychopathy for use in chimpanzees (Pan troglodytes), the Chimpanzee Psychopathy Measure (CPM), and asked 6 raters to complete this index on 34 chimpanzees. The CPM (a) ...
Bode F - - 1999
Episodes of repetitive P wave undersensing have been described in dual chamber pacemakers due to automatic extension of the postventricular atrial refractory period (PVARP). Pacemaker stimulation was completely inhibited despite the presence of adequate P waves. This study sought to determine whether cycles of repetitive P wave undersensing occur even ...
Yesil M - - 1999
Although arrhythmias are common in hypertrophic cardiomyopathy (HCM), complete atrioventricular (AV) block is very unusual. A 27-year-old female presented with a recent history of syncope and exercise intolerance. ECG demonstrated complete AV block. Two-dimensional Doppler echocardiography revealed HCM with a 60 mmHg left ventricular outflow tract (LVOT) gradient. A temporary ...
van Den Berg M P - - 1999
A 54-year-old man presented with total atrioventricular (AV) block 3 months after dynamic cardiomyoplasty was performed because of heart failure due to idiopathic dilated cardiomyopathy. Though the cardiomyostimulator acted as a back-up pacemaker, a DDDR pacemaker was implanted to optimize hemodynamics. During testing no cross-sensing or cross-stimulation between the pacemaker ...
Burke M C - - 1999
Pectoral implantation of transvenous non-thoracotomy internal cardioverter defibrillators (ICD) has resulted in very few complications whether placed subpectorally or subcutaneously. We report the case of a 68 year old man with a subpectorally implanted MINI-plus (Cardiac Pacemakers, Incorporated, St. Paul, Mn.) transvenous ICD who developed nearly instantaneous severe ipsilateral shoulder ...
Hawley RJ - - 1999
OBJECTIVES: To determine risk factors for cardiac complications in patients with myotonic dystrophy, and to determine whether permanent cardiac pacemakers may be beneficial in the treatment of myotonic dystrophy heart disease. BACKGROUND: Myotonic dystrophy affects the cardiac conduction system. Cardiac pacemakers are easily implanted and can be life-saving in patients ...
Gregoratos G - - 1999
OBJECTIVE: To review (1) the physiologic changes of aging that may lead to the need for a permanent pacemaker; (2) the current standard indications for pacemaker implantation as reported in expert guidelines; (3) newer investigational uses of pacemakers; (4) advances in pacemaker technology; and (5) cost-effectiveness of permanent pacing. DATA ...
Belott P - - 1999
Thoracic electrical bioimpedance (TEB) provides a rapid, accurate, cost-effective method of optimizing the atrioventricular delay in dual-chamber pacemakers. In addition to measurements of cardiac output, TEB provides other hemodynamic indices such as systolic time interval, left cardiac work index, and end diastolic index. The availability of this additional data can ...
Arbane M - - 1999
A 76-year-old woman had a permanent transvenous DDDR pacemaker implanted for complete atrioventricular block. She was hospitalized 4 years later for recurrent transient ischaemic attacks related to dislodgment of the atrial lead into the left atrium through a patent foramen ovale. The patient was successfuly treated by transvenous extraction of ...
Roth B J - - 1999
If current is flowing in cardiac tissue, and if the myocardial fibres approach a sealed boundary at an angle, then the tissue within a few length constants of the boundary is polarised. This polarisation occurs when the cardiac tissue has different anisotropy ratios in the intracellular and extracellular spaces. This ...
Blum M - - 1999
During vertebrate embryonic development, the organs of the chest and abdomen, heart, lung and gastrointestinal tract, acquire characteristic asymmetric positions with respect to the left-right body axis. In the beginning of the 20th century Hans Spemann and his co-workers described manipulations of amphibian embryos which resulted in inversion of organ ...
Trigano J A - - 1999
This report describes a patient admitted for the treatment of a pocket infection occurring 5 months after a dual chamber pacemaker implantation. The ventricular lead had been inadvertently placed into the left ventricle through the arterial system. After careful examination using transesophageal echocardiography and left heart angiogram, successful percutaneous extraction ...
Cardall T Y - - 1999
Many people benefit from the implantation of cardiac pacemakers for management of certain cardiac dysrhythmias. These patients are seen regularly in the Emergency Department with a variety of pacemaker complications and malfunctions. The presence of a pacemaker may also affect management of unrelated medical problems. This, the second of a ...
Edgar D R - - 1999
Episodes of serious but infrequently occurring cardiac arrhythmias can be difficult to detect and analyse, even with modern Holter monitoring. A previous diagnostic pacemaker developed by this group provided VVI pacing therapy and recorded intracardiac ECG signals but had no atrial sensing or impedance measuring capability. A new external diagnostic ...
Grondin S - - 1999
Asymmetrical hand function was examined in the context of expert sports performance: hitting in professional baseball. An archival study was conducted to examine the batting performance of all Major League Baseball players from 1871 to 1992, focusing on those who batted left (n = 1,059) to neutralize the game asymmetry. ...
Kennergren C - - 1999
OBJECTIVE: Excimer Laser technique can be used to extract leads. We present the European multi-centre experience. METHOD: The Spectranetics Excimer Laser is a Xenon-Chloride laser with a wavelength of 308 nm, not visible to the human eye. This cool cutting laser (50 degrees C) has an absorption depth of 0.06 ...
Windmann S - - 1999
Performance on heartbeat counting tasks is usually interpreted in terms of cardiac sensitivity. We tested the hypothesis that heartbeat counting is influenced by beliefs about heart rates by dissociating beliefs about heart rates and actual heart rates. In a within-subjects design, heart rates of 50 patients with cardiac pacemakers were ...
Cardall T Y - - 1999
Many people benefit from the implantation of cardiac pacemakers for management of certain cardiac dysrhythmias. These patients are seen regularly in the emergency department with a variety of pacemaker complications and malfunctions. The presence of a pacemaker may also affect management of unrelated medical problems. This two-part series reviews the ...
Lowe M D - - 1999
The putative beta4-adrenoceptor mediates positive inotropic effects, action potential shortening and arrhythmias in ferret ventricle. Here we compared the affinity of carvedilol at the putative beta4-adrenoceptor and beta1-adrenoceptor, activated by (+/-)-CGP 12177 and (-)-isoprenaline, respectively. In paced right ventricular preparations, carvedilol (0.01-10 micromol/l) was a simple competitive antagonist of the ...
Janssens U - - 1999
Only few reports exist addressing the problem of temporary pacemaker leads associated with thromboembolic disease. We report the case of a 67-year-old patient who required a temporary transfemoral pacemaker due to AV block grade III. The patient developed extensive right atrial and ventricle thrombus formation attached to the pacing wire, ...
Wiegand U K - - 1999
INTRODUCTION: Single lead VDD pacing has offered an alternative to DDD systems in patients with isolated AV block. Up to now, however, the relative performance of these pacemaker systems was not systematically compared. METHODS AND RESULTS: Three hundred sixty patients who received either a VDD pacemaker (n = 180) or ...
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