View clinical trials related to Tachycardia.
Filter by:The Dual Chamber & Atrial Tachyarrhythmias Adverse Events Study (DATAS) was designed to analyze the ability of dual chamber ICDs, to reduce clinically significant adverse events as compared to single chamber ICD in a non selected population with conventional indication of ICD implantation.
The purpose of the study is to demonstrate the efficiency on AT / AF prevention and termination of a new algorithm contained in the Medtronic AT500 Antitachycardia device in patients with conventional pacemaker indications.
INTRINSIC RV is a two-armed randomized trial that will compare the effects of innovative dual-chamber pacing with AV Search Hysteresis to standard VVI among ICD patients.
RIGHT is a randomized, prospective, two-arm study that will assess the differential efficacy of VITALITY 2 implantable cardioverter defibrillators (ICDs) using Rhythm ID™ versus selected Medtronic ICDs.
To compare the efficacy of RV and BiV ATP for the termination of ventricular arrhythmias in patients who are candidates to a cardiac resynchronisation therapy (CRT) and have a Class I or IIA indication for ICD implantation. The hypothesis of delivering ATP from different sites (RV or BIV) has never been evaluated in a prospective, controlled and randomized study.
The purpose of this study is to estimate and quantify the difference in efficacy of two sequences of ATP therapies (burst 15 pulses, 88% versus burst 8 pulses, 88%) during an episode of spontaneous rhythms classified as fast ventricular tachycardia (FVT) via ventricular fibrillation (VF) in patients who have a Class I or II A indication for ICD implantation, and thus to promote the "painless" therapy aspect of ICD treatment and improve quality of life outcomes for patients.
To determine whether the administration of test article will decrease the occurrence of ventricular arrhythmias in patients who have acute coronary syndrome (unstable angina, ST segment elevated myocardial infarction or myocardial infarction without ST elevation).
This study will investigate the relationship between susceptibility to hypnosis and regulation of the autonomic nervous system (nerves that control involuntary body functions, such as heart rate and sweating). Hypnosis is a state of mind in which the individual is highly focused, relatively unaware of his or her surroundings, and possibly more able to accept and use therapeutic suggestions. People vary in their responsiveness, or susceptibility, while in hypnosis. People with certain conditions, such as chronic fatigue syndrome (CFS), chronic pain, posttraumatic stress disorder (PTSD), and generalized anxiety disorder (GAD) have altered hypnotic susceptibility. Patients with chronic orthostatic intolerance (COI) often have symptoms similar to those of individuals with CFS, chronic pain, PTSD, and GAD, and this study will examine how patients with COI respond to hypnosis as compared with healthy normal volunteers. COI is a group of disorders characterized by intolerance to prolonged standing. Among them are neurocardiogenic syncope (NCS), in which patients have recurrent episodes of sudden loss of consciousness, and postural tachycardia syndrome (POTS), in which patients have a sustained increase in heart rate after standing. In addition to the comparison of COI and normal volunteer responses to hypnosis, the study will examine how hypnotic susceptibility is related to the ability to control autonomic functions such as blood pressure, heart rate, and sweating. The autonomic nervous system is activated when the body is stressed, not only from physical stimuli such as cold temperature, but also from mental stimuli, such as seeing a rattlesnake up close. Hypnosis may, therefore, be a useful tool to understand how the mind controls the autonomic nervous system. Healthy normal volunteers and patients with NCS or POTS who are 18 years of age or older may be eligible for this two-part study. In part 1, participants complete a questionnaire and are then tested for hypnotic susceptibility. For this test, a professionally trained physician guides the subject through a procedure to achieve a hypnotic state. The subject is asked to perform several simple tasks and is then guided back to a normal state of being. In part 2, the subject undergoes hypnosis again, during which the physician offers various suggestions while monitoring activity of the subject's autonomic nervous system. The subject is connected to various sensors that continuously monitor blood pressure, heart rate, blood flow, sweat response, skin electrical conduction, and brain wave activity. An intravenous catheter is inserted into an arm vein to collect blood samples. At the end, the subject is guided back to a normal state of being. The hypnosis session in part 1 is videotaped in order to: 1) permit review by a scientist who is unaware of the subject's condition and whose judgment will not, therefore, be biased; and 2) have a record of the experimental data. Only qualified investigators will view the videotape.
To evaluate children undergoing catheter ablation at pediatric centers in North America in order to provide information on the incidence rate of serious cardiac damage as a result of ablation, the incidence rate and time course of recurrence after initially successful ablation, and the incidence rate of proarrhythmia following ablation.
To screen by electrocardiography the entire population of 1,400 individuals in seven Amish Mennonite communities in order to perform genetic linkage studies of long QT syndrome (LQTS).