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Greve H - - 1988
We implanted an "Automatic Implantable Converter-Defibrillator" (AICD) and as far as useful an antitachycardial pacemaker (Intertach) in addition in 11 patients suffering from malignant ventricular tachycardias via a median sternotomy. In eight cases a coronary artery disease and in three cases a dilatative myopathy was the intrinsic disease. During surgery ...
Hassett J A - - 1988
Patients with previously implanted dual chamber pacemakers (PM) may develop atrial flutter (AFL). The Siemens-Pacesetter AFP and Genesis PM have the capability of noninvasively synchronizing to a standard external electrophysiology (EP) stimulator. Any arrhythmia termination or induction protocol may be used with a refractory period limitation of approximately 127 msec ...
Foster C J - - 1988
Four permanent ventricular endocardial pacemaker electrodes which could not be removed via their insertion site have been retrieved via the femoral vein using a Dormier basket. Apart from short-lived ventricular arrhythmias no complications occurred in any case. Where removal of an otherwise unaccessible ventricular pacemaker electrode is considered essential the ...
Byrd C L - - 1988
A 44-month retrospective analysis was performed on 666 pacemakers implanted at Mt. Sinai Medical Center. Mapping techniques and endocardial waveform analyses were used during lead positioning to ensure the best electrical environment. The optimal pacing lead type was selected based on the clinical situation. Follow-up evaluations were rigorous. Patient population ...
Mugica J - - 1988
Recent developments in cardiac pacemaker electrodes have resulted in significant benefits to the group of pacemaker patients as a whole. The results of analysis of 2,818 chronic pacemaker electrodes are presented. These electrodes are divided into major categories according to their particularities: platinum iridium, elgiloy, carbon-tip, anodized platinum and granulated ...
Cooper D D Department of Cardiology, Cleveland Clinic Foundation, - - 1988
Effects of extracorporeal shock wave lithotripsy (ESWL) were studied on 15 pacemakers (standard single chamber n = 5, dual chamber n = 6, rate responsive single chamber [Activitrax] n = 4). In-vitro testing involved suspending the pacemakers in a bath of degassified, deionized water firmly taped to a platform at ...
Shandling A H - - 1988
A 73-year-old male required a permanent pacemaker for complete heart block. After placement of the dual-chamber pacemaker, the patient developed random, repetitive ventricularly paced coupling at the upper rate limit. The diagnosis made from the surface electrocardiography was one of ventricular tracking of occult (T wave obscured) atrial ectopic activity. ...
Schmidinger H - - 1988
To investigate the electrophysiological properties of ventricular impulse formation after His-bundle ablation in 11 patients, incremental ventricular overdrive stimulation studies were performed. The studies, which were spread over a follow-up period of up to 601 days, were carried out invasively with temporary leads as well as noninvasively with the implanted ...
van Gelder L M - - 1988
Total inhibition of a bipolar VVI pacemaker was observed in an 84-year-old female after programming the pulse generator to its highest sensitivity (0.6 mV). After a short period of observation it became obvious that P-wave oversensing was responsible for this phenomenon. Frontal and lateral X-rays showed a normal position of ...
Erdman S - - 1988
The hazards related to ten patients who underwent 11 urologic surgical procedures during a 36 month period were taken into consideration. Electrocautery was used in all instances and there were no complications. All of the pacemakers were preset for ventricular pacing and sensing inhibited or multiprogrammable and were reprogrammed during ...
Fontaine J M - - 1988
Asynchronous pacing during the presence of electromagnetic interference or other sources of "noise" is a protective mechanism available to prevent pacemaker output inhibition. We describe a patient with a DDD pacemaker who had asynchronous dual chamber or noise reversion pacing as a consequence of repetitive signals (QRS complexes) falling into ...
Cotoi S - - 1988
For the functional estimation of artificial pacemakers, we have used two techniques: chest-wall stimulation and transesophageal stimulation. Transesophageal stimulation was always effective in inhibiting the generator, and it was used when chest-wall stimulation was ineffective. These two tests can be easily performed and are of remarkable usefulness in the follow-up ...
Castellanos A - - 1988
A patient had ventricular tachycardia with cycle lengths consistently varying between 400 and 490 ms. Arrhythmias with a similar electrocardiographic pattern had been thought to result from the regular activity of an automatic pacemaker with either 3:2 exit block of the Wenckebach type or alternation in exit conduction times. However, ...
De Reuck J - - 1988
Mono-histiocytes and T-lymphocytes were assessed by the cytochemical alpha-naphthyl-acetate-esterase (ANAE) stain in 50 CSF samples of patients with various neurological diseases. The ANAE-activity of lymphocytes was decreased in multiple sclerosis and subacute sclerosing panencephalitis, while the activity of mono-histiocytes was increased in the group of infarctions and bacterial and viral ...
McGrath L B - - 1988
Of 1,193 consecutive pediatric (less than 18 years) patients undergoing intracardiac repair from 1975 to 1984, 38 (3.2%) developed surgically induced complete heart block and were treated by permanent pacemaker implantation. Anomalies included complete atrioventricular septal defect = 9 (24%), simple ventricular septal defect = 9 (24%), atrioventricular discordant connection ...
Rosengarten M - - 1988
Cardiac pacing systems produce cardiac contractions by delivering electrical charges to the myocardium. Reliable cardiac pacing, and the longevity of pacemakers depends on the absence of electrical leaks. Electrical leaks often do not cause symptoms and if suspected, there are few methods which are able to identify their location and ...
Boineau J P - - 1988
Atrial depolarization was analyzed in 14 patients with the Wolff-Parkinson-White syndrome undergoing surgery to ablate accessory atrioventricular pathways associated with tachyarrhythmias. Bipolar potentials were recorded simultaneously from 156 atrial epicardial electrodes arranged in three templates to fit the anterior and posterior aspects of both atria. Spontaneous or sinus rhythms were ...
Cohen A I - - 1988
The adverse interactions of permanent pacemakers and automatic implantable cardioverter defibrillators (AICD) were studied in nine patients in whom both devices were implanted. Both unipolar and bipolar pacemakers were evaluated. The permanent pacemakers were also used to do noninvasive electrophysiological studies and to induce ventricular fibrillation. Undersensing of ventricular fibrillation ...
Tucker D C - - 1988
Conditions that cause pacemaker formation in the developing heart are poorly understood. Embryonic rat myocardium grafted into the anterior eye chamber of an adult rat provides a promising model system in which to study pacemaker development. Electrophysiologic mapping with two microelectrodes showed that each embryonic heart graft developed a primary ...
LaBan M M - - 1988
External electromagnetic interference with cardiac pacemaker function is a recognized hazard of electronic instrumentation used for diagnosis or therapy. Although improved shielding and circuitry have made newer pacemakers less vulnerable to extraneous electronic artifact, their increasing use may expose more patients to the complications of electromagnetic interference. The effects of ...
May K J KJ - - 1988
Thrombosis of intravascular catheters is a well-recognized and potentially serious complication, which has been treated successfully with thrombolytic agents. A routine echocardiogram in a patient with a temporary transvenous pacemaker demonstrated a large thrombus attached to the pacing electrode. This was dissolved successfully and uneventfully with high-dose intravenous streptokinase therapy. ...
Kamino K - - 1988
Pacemaking areas in the early embryonic chick hearts were quantitatively assessed using simultaneous multiple-site optical recordings of spontaneous action potentials. The measuring system with a 10- X 10- or a 12 X 12-element photodiode array had a spatial resolution of 15-30 microns. Spontaneous action potential-related optical signals were recorded simultaneously ...
Pearson A C - - 1988
Pulsed Doppler echocardiography was used to study the timing and dynamics of left ventricular filling in 14 patients with permanent dual-chamber programmable pacemakers. Pacemakers were programmed to atrial sensed (VDD) mode and atrial-ventricular sequential paced mode at low (DVI-L) and high (DVI-H) heart rates, and pulsed Doppler recordings of transmitral ...
Gottlieb C - - 1988
A middle-aged gentleman with an idiopathic dilated cardiomyopathy, drug-refractory sustained ventricular arrhythmia, and high-degree AV block was managed with an automatic implantable cardioverter-defibrillator (AICD) and a Cordis Multicor II VVI pacemaker. During a routine follow-up visit, the pacemaker threshold was determined. Seven seconds after reprogramming the Cordis pacemaker to the ...
Robbens E J EJ Department of Cardiology, University Hospital, Ghent, - - 1988
We studied the findings in a patient who had a TX 915 pacemaker and who was suffering from an acute inferior myocardial infarction. On admission, we observed pacing at the upper rate limit due to excessive adrenergic tone. Shortly thereafter a strong vagal reaction occurred, and the pacing rate fell ...
Hack M H - - 1988
1. The plasmalogen profiles of a series of hearts from fish to mammals were obtained by various TLC analyses. 2. All specimens (ventricular) contained ethanolamine plasmalogen and some choline plasmalogen, as well. 3. The distribution of these two plasmalogen species was relatable, in part, to (a) phylogeny and (b) ontogeny. ...
Simoons M L - - 1988
We describe a new stainless steel, teflon-coated 2.4 F pacemaker wire with a flexible tip that can be introduced through an extra lumen of a specially designed 7.5 F Swan-Ganz catheter. The extra lumen opens at 19 cm from the tip of the catheter; this opening can be positioned in ...
Sosa E S - - 1988
In March 1984 we implanted a permanent, dual-chambered pacemaker in a 2.1-kg premature male infant suffering from congenital atrioventricular block, with an atrial rate of 170 beats per minute, a ventricular rate of 40 beats per minute, and ectopic ventricular escape beats. Through a left anterolateral thoracotomy, we implanted electrodes ...
Johansen T E - - 1988
The macroscopic anatomy of gubernaculum testis and processus vaginalis has been carefully studied during 150 consecutive orchiopexies. In subcutaneous and canalicular testes a well defined gubernaculum was found representing a morphologic continuity from the testis to the bottom of the scrotum. The gubernaculum was detectable in only one of four ...
Page R A - - 1988
Airborne lead has been measured at four urban, one semi-urban and one rural site in Wales during 1984, 1985 and 1986 to assess the effect of the reduction in lead additives in petrol which was required by an EC Directive at the beginning of 1986. The results showed a 52-61% ...
Gilchrist I C - - 1988
A retrospective analysis of 217 consecutive patients with chronic bundle branch blocks undergoing cardiac catheterization was done to evaluate the need for temporary transvenous pacing during coronary arteriography. In patients without temporary right ventricular pacemakers (n = 185), only one episode of high-grade atrioventricular block occurred during coronary arteriography which ...
Johnson L W - - 1988
Because of a perceived high frequency of ventricular fibrillation when a pacemaker catheter was placed in the right ventricular apex during PTCA, we reviewed our first 400 cases for this complication. The incidence of ventricular fibrillation in the entire group was 10 of 400 cases (2.5%) compared with 17 of ...
Inoue D - - 1987
Two cases of malfunctioning APC (American Pacemaker Company) Devices pacemakers are reported. Two patients with sick sinus syndrome were temporarily paced using APC Devices pacemaker models EC 4542 and EV 4543 respectively, which showed transient increase (53% and 83% of the preset rate, respectively) in pacing rate. The sudden increase ...
Gilchrist I C - - 1987
The risk of life-threatening ventricular arrhythmias complicating coronary angiography is reportedly increased in patients in whom temporary righ ventricular pacemakers are used. Placement of the temporary pacing electrode in the right atrium or vena cava during angiography theoretically removes from the vulnerable ventricle a source of mechanically or electrically induced ...
Janosik D L - - 1987
The value of ambulatory electrocardiography (AECG) in detecting pacemaker dysfunction before hospital discharge was assessed in 100 patients a mean of 1.2 days after pacemaker implantation. The incidence of permanent pacemaker dysfunction detected by AECG in the early postimplantation period, the frequency that pacemaker dysfunction detected by AECG was not ...
Barold S S - - 1987
Fifty-seven patients with implanted DDD pulse generators (23 Intermedics Cosmos and 34 Medtronic Symbios) were studied to characterize the behavior of the so-called ventricular safety pace period or nonphysiologic AV delay (ventricular triggering period) in a variety of circumstances. The pulse generators were programmed to various combinations of upper rate, ...
Schang J C - - 1987
The effects of vasopressin on colonic motility were investigated in 6 healthy subjects and 10 patients with chronic idiopathic constipation. Recordings of the colonic myoelectric spiking activity were performed by means of 50-cm long silastic tube, equipped with four bipolar ring electrodes fixed at 10-cm intervals, which was introduced by ...
Malik M - - 1987
A computer simulation model of cardiac rhythm and heart-pacemaker interactions has been used to examine the response of short AV delay DDD pacing to an atrial premature depolarization in patients with a potential junctional reentry circuit. Special attention was given to the possibility of using the pacemaker to prevent atrioventricular ...
Jadvar H - - 1987
There are many clinical situations that present the need for special purpose electrocardiography using standard equipment. These include monitoring cardiac activity from temporary myocardial leads implanted following cardiac surgery, detecting signals from intracardiac catheter leads, and noninvasive atrial recording from the esophagus. It is often difficult to connect nonstandard leads ...
Toivonen L K - - 1987
Disabling presyncopal attacks were provoked in a patient with a sinus nodal disorder and cardiac pacemaker by treatment with antianginal vasodilators. At cardiac catheterization a severe fall in aortic pressure was documented during ventricular pacing, when desynchronized atrial contractions coincided with ventricular systoles. After withdrawal of the medication, no obvious ...
Haxton M J - - 1987
Abnormalities of in-vitro sperm-mucus penetration, ovarian hormone deficiency, specifically poor progesterone surge, and luteal cyst formation were assessed prospectively in 95 couples with fully investigated primary infertility of greater than or equal to 3 years duration. Abnormal sperm-mucus penetration was found in 22, half of whom could have been identified ...
Quintal R E - - 1987
We describe pacemaker pauses and pseudohysteresis resulting from sensing of retrograde P waves in a patient with an implanted AV sequential universal pacemaker. Although retrograde P waves are usually followed by a ventricular spike and therefore create the possibility for "endless loop tachycardia," in our patient some retrograde P waves ...
Sheron N - - 1987
The loss of atrial contraction can seriously impair cardiac output when complete heart block follows myocardial infarction. We describe two cases in which temporary sequential atrioventricular pacing was lifesaving. The pacemaker used was a previously explanted internal pacemaker. By avoiding the need for an expensive dedicated temporary pacemaker this technique ...
Kuhn H J - - 1987
The development of the heart of Tupaia belangeri from the first endothelial-lined lumina to the cardiac loop is described in 20 embryos with 2 to 14 somites, from ontogenetic days 11 and 12. Bilateral endocardial tubes transporting blood are found in the 8-somite embryo; in the middle cardiac plate, angioblasts ...
Hoeppner J B - - 1987
Stories were elicited from 29 epileptic patients with generalized, simple partial, and complex partial seizures with bilateral, right, or left foci, and from 32 persons in two control groups. Four older epileptic patients with long histories of left complex partial seizures were verbose. Their stories involved trivial and subjective details, ...
Skepper J N - - 1986
The structure of nexuses in the atrioventricular node of the golden hamster was studied with the transmission electron microscope, using thin sections and freeze-fracture replicas, and was compared with that of nexuses in the working myocardium of the right ventricular wall. Whereas ventricular myocardium contained macular nexuses only, nodal tissue ...
Cubicciotti D D DD - - 1986
The New World primates Callicebus moloch and Saimiri sciureus differ markedly in life modes. Physiological responsiveness (heart rate, cortisol) of these related taxa was compared in two situations that differed in the presumed degree of stress imposed, exposure to a novel environment and physical restraint. In both situations, Saimiri exhibited ...
Malhotra R - - 1986
Growth in the thoracic region and its adaptation to higher altitude was investigated in boys between 5 to 18 years of Rajput origin at two altitudes, i. e. Rampur Bushahr (800 m above sea level) and Kinnaur (3,000 m above sea level). Both places are located in Himachal Pradesh. The ...
Markewitz A - - 1986
Sinus node disease (SND) has caused many controversies about the appropriate stimulation mode. We compared the advantages and disadvantages of VVI, AAI, DDD, and DDI mode. In an additional study, left ventricular function at rest (R) and during exercise (E) was investigated in dual chamber and ventricular stimulation mode with ...
Zimmern S H - - 1986
Myopotential signals were recorded from atrial and ventricular leads during isometric exercise in 25 patients who had chronically implanted dual chamber pacemakers using the electrogram telemetry capability of the pacemakers. Average electrogram amplitude on the atrial channel was 0.92 mV (range 0.3 to 1.9) and on the ventricular channel was ...
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