نتایج جستجو برای: pacemaker
تعداد نتایج: 26164 فیلتر نتایج به سال:
The clinical importance of the latency and supernormal phase of recovery is stressed. Observations on these phases of the heart cycle in 23 patients and in io dogs are presented. In experiments the pheomenon of latency could be shown with pacemaker impulses exceeding 6 times the diastolic threshold level. In the course of clinical investigations the phenomenon of latency was observed in a patie...
BACKGROUND Magnetic resonance imaging (MRI) of pacemaker patients is contraindicated due to documented potential risks to the patient from hazardous interactions between the MRI and pacemaker system. OBJECTIVE The purpose of this prospective, randomized, controlled, worldwide clinical trial was to evaluate the safety and effectiveness of a pacemaker system designed for safe use in MRI for any...
AIM To audit prospectively the reasons for pacemaker implantation, the duration of the pacemaker use, the cause of death, and pacemaker function after removal from the patient. METHODS Pacemakers were removed at necropsy, or from the bodies of patients awaiting cremation, in three hospitals over a three year period. The cause of death was taken from the results of the necropsy or from the cer...
The rhythmic contraction of the heart is initiated and controlled by an intrinsic pacemaker system. Cardiac contractions commence at very early embryonic stages and coordination remains crucial for survival. The underlying molecular mechanisms of pacemaker cell development and function are still not fully understood. Heart form and function show high evolutionary conservation. Even in simple co...
Cardiac perforation by pacemaker is a rare but potentially fatal complication. Acute perforations occurring within twenty-four hours of insertion of pacemaker can lead to hemopericardium, cardiac tamponade, and death. Hemothorax occurring as an acute complication of pacemaker insertion is reported but extremely rare. Previously, hemothorax and shock as a subacute complication following pacemake...
A pacemaking system consists of an impulse generator and lead or leads to carry the electrical impulse to the patient's heart. Pacemaker and implantable cardioverter defibrillator codes were made to describe the type of pacemaker or implantable cardioverter defibrillator implanted. Indications for pacing and implantable cardioverter defibrillator implantation were given by the American College ...
The preBötzinger complex (preBötC) is essential for normal respiratory rhythm generation in rodents, for which the underlying mechanisms remain unknown. Excitatory preBötC pacemaker neurons are proposed to be necessary for rhythm generation. Here we report the presence of a population of preBötC glycinergic pacemaker neurons. We used rhythmic in vitro transverse slice preparations from transgen...
The paper considers a synergistic analysis of the physical and physiological nature electrical processes in human heart, namely most important biosystem – conduction nervous system heart (CNSH), particular, pacemaker. Currently, promising methods for studying CNSH as an active medium are being actively developed, using foundations nonlinear dynamics. Methods describing media widely used study p...
Permanent pacemaker implantation improves survival but can cause tricuspid valve dysfunction in the form of regurgitation (TR). The dominant mechanism pacemaker-mediated TR is lead impingement. This study evaluated association between location leads crossing and incidence worsening impingement using fluoroscopy. Lead positions were perpendicular right anterior oblique (RAO) parallel left (LAO) ...
INTRODUCTION A permanent pacemaker is frequently needed after transcatheter aortic valve implantation, but the available data are mainly on the CoreValve system. OBJECTIVE To evaluate the need for new permanent pacemaker after implantation of the Edwards Sapien device, as well as related factors. METHODS We included the first 100 patients treated with the Edwards Sapien device at our instit...
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