Active clinical trials for "Tachycardia"

In children, radiofrequency catheter ablation (RFCA) or cryoablation are highly effective treatments for supraventricular tachycardia treatment. General anesthesia is often required to ensure comfort during the prolonged procedure and to assure immobility in order to facilitate accurate mapping and subsequent ablation of the accessory pathway and/or arrhythmogenic focus. Successful anesthetic management of this patient population requires adequate suppression of sympathetic responses during the procedure while electrophysiological parameters remain unaltered for mapping purposes and subsequent ablation. Although Sevoflurane (SEVO) and Isoflurane (ISO) are two commonly used and evaluated volatile anesthetic agents for ablation procedures, comparison of those agents has not been performed previously not in adults, not in children. Hypothesis Time required for basic EP intervals, successful induction of SVT and successful RFCA or cryoablation in children will not be different between patients undergoing Sevoflurane or Isoflurane-based anesthesia.

The purpose of this study is to determine the efficacy of VT ablation guided by functional evaluation of the substrate to specifically target the reentry-vulnerable zones in patients with infarct-related VT.

Postural orthostatic tachycardia (POTS) is characterized by abnormalities in the autonomic nervous system in the body. The autonomic nervous system controls and regulates body functions such as heart rate, breathing, digestion, and more. The investigator has shown that patients with POTS have higher cardiovascular and adrenergic activating autoantibodies (AAb), which likely changes the normal make-up of POTS. There are autoantibodies that have been suggested by a few reports of their presence in POTS, but their role different aspects of POTS is unknown. The study will look at the body's responses in patients with POTS. The crossover study design is to have half of the patients will start with sham followed by active stimulation and half will start by active followed by sham stimulation. It is anticipated that results will provide a potential therapeutic approach based on the understanding of POTS.

Carvedilol is known to be effective in reducing ventricular arrhythmias and mortality in patients with heart failure. It is suggested that one of the mechanisms is its ability to block store overload-induced Calcium release which activates spontaneous calcium release by Ryanodine receptors. Ventricular outflow tract tachyarrhythmia is known to be associated with calcium overload due to activation of Ryanodine receptors. The aim of this study is to evaluate the efficacy of Carvedilol on premature ventricular complex(PVC)/ventricular tachycardia(VT) originating from outflow tract.

Previous monocentric experiences have already highlighted the role of preoperative cardiac imaging, in particular of cardiac magnetic resonance (CMR) and tomography (CT), in improving the ablation results of scar-related ventricular tachycardia (VT). A better characterization of scar obtained with high quality CMR images and post processing data with creation of maps exploring the heart in concentric layers from the endocardium to the epicardium could allow a personalized and more precise approach to this pathology. Aim of the study - Evaluating the feasibility and possible benefit of CMR-guided ablative approach (group 1: ablation of the "anatomical" channels of heterogeneous tissue within the scar) compared to CMR-aided approach (group 2: ablation of the "electrical" conduction channels within the scar) and standard approach (group 3: ablation guided by an electro-anatomical system without the aid of CMR) in a multi-center Tuscan study. What would add the project to what we know - The achievement of the objectives by the project would allow to propose a personalized ablation on the basis of the scar characterization and would allow a better efficacy, efficiency of the procedure and probably also a safer treatment

This study is aimed to compare the feasibility, safety and efficacy of a zero-fluoroscopic approach using Ensite NavX with conventional fluoroscopic approach using Ensite NavX plus fluoroscopy for the ablation of paroxysmal supraventricular tachycardia.

The investigators will test to determine if an external Automated Abdominal Binder (non-commercial product) during high sodium diet improves orthostatic tolerance, compared to wearing the binder during a low sodium diet session.

Background: - The autonomic nervous system helps control things that happen automatically in the body, like blood pressure, heart rate, and digestion. When it doesn t work properly, it s called dysautonomia. Researchers want to learn more about dysautonomias and train doctors to learn how to better diagnose them. Objectives: To allow people with autonomic disorders to be evaluated. To help fellows in the NIH Autonomic Disorders fellowship program see a variety of diseases in their training. Eligibility: People age 18 and older with dysautonomia; children over age 2 if they might benefit Healthy adult volunteers Design: Participants will have different procedures depending on their symptoms. They will have one or more visits. They will have some but not all of the tests below. Participants will have a medical history and physical exam. They may be tested for problems thinking. They may complete a symptom questionnaire. They may have their temperature and blood pressure taken. Participants may have an intravenous line placed. A needle will guide a thin plastic tube into an arm vein. Participants may have blood drawn several times. They may give a urine sample. Participants may have an electrocardiogram. How much blood a participant s heart is pumping and/or how much blood is flowing through their arm may be measured. The total amount of blood in their bloodstream may be measured. Participants may have their ability to sweat and/or sense of smell tested. Breathing, bowel sounds, and/or body functions may be monitored. Pupil size, response to environmental temperature changes, and/or breathing may be measured. Participants may have a bladder ultrasound. Small pieces of skin may be taken for study.

The investigators hope to learn the feasibility and preliminary efficacy of the Embr device for improving thermal comfort in individuals with POTS and impaired thermoregulation. Feasibility will be assessed via usage of the Embr device and participant feedback. Preliminary efficacy measures will include temperature-related symptoms and temperature- related quality of life in individuals with POTS and impaired thermoregulation.

This study is intended to compare the feasibility, safety and efficacy of a zero-fluoroscopic approach with conventional fluoroscopic approach as performing catheter ablation of right atrial arrhythmias.