View clinical trials related to Tachycardia.
Filter by:This non-randomized study will examine the safety and efficacy of irrigated bipolar radiofrequency (RF) ablation in the treatment of ventricular tachycardia (VT) in patients for whom standard VT unipolar RF ablation has been unsuccessful. VT is a serious abnormality of the heart's electrical system. Ablation is a procedure that cauterizes heart tissue using catheters (long tubes that can be moved within or along the outside of the heart). Cauterizing the heart tissue is accomplished by using heat to damage the abnormal heart tissue that is not working well so that it can stop affecting the rest of the heart. Usually, heat is delivered using a unipolar catheter, in which energy travels from the catheter tip to a grounding pad. This research study seeks to find out if a bipolar ablation catheter, in which the energy travels between two catheter tips on either side of the heart muscle, can be used to eliminate the arrhythmia when the unipolar ablation is unsuccessful. The hypothesis is that the increased current density and improved rates of transmural lesion creation seen with bipolar RF ablation will lead to successful arrhythmia termination with minimal or no increased risk of complication.
There is few information about the association between supraventricular arrhythmia different from atrial fibrillation (AF) or atrial Flutter and the risk of stroke. In this study the investigators hypothesized that the presence of atrial tachycardia would lead to atrial fibrillation and recurrent stroke in patients hospitalized for cryptogenic stroke. The investigators study the association of atrial tachycardia (AT), defined as four or more consecutive premature atrial beats, and AF, recurrent stroke and cardiovascular mortality in 192 consecutive patients hospitalized because of cryptogenic stroke. The follow-up was 12 months for all population
The main purpose of this study is to determine the effects of controlling the heart rate of patients with septic shock using an intravenous medication called esmolol.
Rationale: Nowadays ventricular tachycardia (VT) ablation in structural heart disease is performed primarily by early referral; while at the same time we still struggle with the limited longterm ablation success of endocardial VT ablation. An underestimated number of VTs from ischemic substrate have an epicardial exit. However, one cannot accurately predict who is in need of epicardial ablation. The investigators hypothesise endo/epicardial substrate homogenization in a first approach to be superior to endocardial substrate homogenization alone, in terms of recurrence on follow-up. Objective: To show superiority of a combined endo/epicardial approach compared to a stepwise approach in the ablation of ventricular tachycardia in a population with ischemic cardiomyopathy on VT recurrence. Study design: Multicenter prospective open randomized controlled trial. Study population: All patients above 18 years with an ischemic cardiomyopathy being referred for a ventricular tachycardia ablation. Intervention: One group undergoes endo/epicardial ablation and the other group has endocardial ablation only as a first approach. Main study parameters/endpoints: The main study endpoint is the difference in recurrences of ventricular tachycardia on follow-up - clinical or on implantable cardioverter defibrillator (ICD) interrogation - between the two ablation groups; secondary endpoints are procedure success and safety.
This study uses an Alizarin Red powder mixture to characterize the sweat distributions in youth during tilt table testing. Patients with a known orthostatic sweat response from a prior clinical tilt table test in the investigators laboratory will be recruited. The Alizarin Red powder will be applied to exposed skin, and quantitative sweat will be measured at the thigh. During tilt testing, serial photos will be taken once the sweat response occurs. Sweat distributions will be compared during syncope (orthostatic sweat), during periods of anxiety (emotional sweat), and in patients with POTS (with and without syncope).
Incident and extent of pulse alteration during administration of various modes of local anesthesia in children during routine dental treatment. Our aims are: (1) To estimate the percent of patients who receive mandibular block , C-CLAD-IL or infiltration injections and show increase in their pulse rate during the delivery of anesthesia (in spite of negative aspiration) as result of infiltration of adrenalin into their blood vessels. (2) To estimate the extent of pulse rate alteration in correlation with the velocity or volume of local anesthesia injected. (3) To examine the correlation between increase in the pulse rate and effectiveness of anesthesia. (4) To examine the correlation between the needle gauge (27 & 30) and increase in pulse rate during mandibular block injection in spite of negative aspiration. We will recruit children that undergo routine dental treatment under local anesthesia (such as mandibular block, infiltration or C-CLAD-IL). Patients will be connected, immediately before and during the entire delivery of the local anesthetic, to pulse-oximeter that will be connected to a computer and continuously monitor pulse rate and saturation during the delivery of local anesthesia. Each aberrant event which may occur during alteration of the pulse rate such as gag reflex, coughing, or pain related disruptive behavior will be documented on the computer in real time by another person that is not the treating dentist. All types of local anesthesia delivery will be performed by the computerized-controlled local anesthesia delivery system - Single-Tooth-Anesthesia which connected to a computer and documents continuously the amount and velocity of the local anesthetic delivered to the patient. All injections will be performed by using a 29 gauge needle, except when children will be treated under general anesthesia, the injection will be performed also by 27 gauge needle. In case the pulse rate will increase to 150% of the baseline rate, or when the pulse will reach 150 beats/minute the injection will be stopped immediately. The continuation of the local anesthetic delivery will be continued in different location and only after the return of the pulse to its basic rate. A total of 100 patients will receive local anesthetic containing 1:100,000 adrenalin and 50 patients without adrenaline. Three modes of local anesthesia will be evaluated: C-CLAD-IL, infiltration and mandibular block= a total of 300 patients.
The study evaluates whether catheter based radiofrequency ablation is superior to optimized antiarrhythmic medical therapy in preventing ventricular tachyarrhythmia relapses in patients with ischemic heart disease and implantable cardioverter defibrillator.
This study to is being conducted in India to determine the role of catheter-based ablation for ventricular tachycardia (VT) in post- heart attack patients who meet established guidelines for implantable cardiodefibrillator (ICD) implantation, but cannot afford it. These patients would be started on chronic Amiodarone therapy, which has been shown to be effective but can often lead to multiple side effects. Patients will therefore be randomized in an even proportion to either a) the control group, receiving chronic Amiodarone therapy, or the study group, undergoing catheter ablation of VT in addition to chronic Amiodarone therapy. This trial will serve as a representative model for the developing world.
The primary objective of this study is to demonstrate the superiority of at least 1 dose of intranasal (IN) MSP-2017 (Etripamil) over placebo in terminating PSVT induced in an electrophysiology (EP) laboratory.
Some patients experience high heart rates and symptoms of light-headedness, fatigue, headache during standing despite well maintained blood pressure. These patient are disabled and can't be in upright position for a longer time. The purpose of this study is to test whether electrical stimulation of a nerve through a skin of the ear may improve heart rate response and reduce disabling symptoms.