نتایج جستجو برای: external pacing
تعداد نتایج: 202547 فیلتر نتایج به سال:
BACKGROUND Abnormal activation of the ventricles via right ventricular apical pacing deteriorates cardiac function, which may explain the increased mortality of patients with congestive heart failure receiving permanent pacemakers. We hypothesized that pacing at alternative sites may cause less detrimental effects on the cardiac function. METHODS Five symptomatic patients with either advanced...
AIMS Cardiac resynchronization therapy (CRT) devices report percentage pacing as a diagnostic but cannot determine the effectiveness of each paced beat in capturing left-ventricular (LV) myocardium. Reasons for ineffective LV pacing include improper timing (i.e. pseudofusion) or inadequate pacing output. Device-based determination of effective LV pacing may facilitate optimization of CRT respon...
Although atrial synchronous and rate-responsive ventricular pacing have been compared, the importance of maintaining synchronized atrial systole in addition to rate responsiveness has been incompletely defined. That is, the effects of these two pacing modes on cardiac volumes and contractility have not been studied. Accordingly, 16 patients with normal ventricular function were studied while in...
OBJECTIVES We sought to test the postulate that biventricular pacing diminishes the need for appropriate tachycardia therapy. We reviewed the frequency of therapy in patients, serving as their own controls, who were enrolled in the Ventak CHF (congestive heart failure) biventricular pacing study. BACKGROUND It is well established that both acute and chronic CHF contribute to the need for tach...
BACKGROUND We evaluated the effects of the site of ventricular pacing on left ventricular (LV) synchrony and function in children requiring permanent pacing. METHODS AND RESULTS One hundred seventy-eight children (aged <18 years) from 21 centers with atrioventricular block and a structurally normal heart undergoing permanent pacing were studied cross-sectionally. Median age at evaluation was ...
As packet switching speeds scale to Terabits-per-second and beyond, power considerations are increasingly forcing core router manufacturers to adopt all-optical and hybrid opto-electronic single-chip switching solutions. Such routers will have small buffers, typically in the range of a few tens of Kilobytes, causing potentially increased packet loss, with adverse impact on end-to-end TCP perfor...
Computer simulation of Electrophysiology Study (EPS) is realized by employing pacing protocols in EPS with the Wei-Harumi model. Intracardiac electrograms induced by typical pacing protocols–including the basic interval measurement, atrial extrastimulus pacing, ventricular extrastimulus pacing, incremental atrial pacing, and incremental ventricular pacing are successfully reproduced with a mode...
Current pacing practice is undergoing continuous and substantial changes. Initially pacing had an exclusively palliative role, since it was reserved for patients developing complete heart block or severe symptomatic bradycardia. With the appearance of novel pacing indications such as pacing for heart failure and atrial fibrillation, the effect of pacing site on cardiac function has become a cri...
Epicardial wires allow temporary pacing after cardiac surgery. Pacing is often the best, and sometimes the only method of treating temporary rhythm disturbances in this context. Temporary epicardial pacing has evolved from simple one-chamber systems to dual chamber, biatrial, and even biventricular systems. The first part of this two-part review provides an overview of the management of tempora...
In areflexic canine right heart bypass preparations, little difference in ventricular function was observed as a result of atrial pacing, sequential atrioventricular pacing, or atrial-His bundle pacing at an appropriate atrial systole-ventricular systole (As-Vs) interval. Ventricular function was depressed during ventricular pacing and during atrioventricular pacing with an inappropriate As-Vs ...
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