Active clinical trials for "Tachycardia"

The aim of this study is to quantify and characterize the outcomes of radiofrequency (RF) ablation after, and the utility of electroanatomical mapping with the Advisor™ HD Grid Mapping Catheter, Sensor Enabled™ (hereafter called "HD Grid") and EnSite Precision™ Cardiac Mapping System (SV 2.2 or higher, hereafter called "EnSite Precision") with HD Wave Vmax voltage mapping (hereafter called "HD Wave") in subjects with PersAF or VT in real-world clinical settings.

In this study, the investigators aim to examine the prognostic role of subsequent Atrial Tachycardias (ATs) in the mechanisms of atrial fibrillation (AF). Therefore, the investigators compare patients who were randomly assigned to either undergo cardioversion after AF has been terminated to AT or further ablation until the achievement of sinus rhythm.

The purpose of this study is to evaluate feasibility of using new technologies to characterize ventricular wall motion in patients indicated for mapping and ablation procedures. Echo will be performed preoperatively and patients will receive a 1-month followup telephone call.

Observational study is evaluating Ventricular Tachycardia (VT)/Ventricular Fibrillation (VF) thérapies as a function of ventricular pacing

The SENSE-AF study aims to determine the performance of the OptiSense lead in sensing fine episodes of Atrial Tachyarrhythmia/Atrial Fibrillation (AT/AF) and rejecting Far-Field R Wave (FFRW). The performance of the lead will be measured as a difference in device-determined time in AT/AF and surface-ECG determined time in AT/AF. This measurement will be compared to the control group which will be randomized to receive SJM's Tendril™ RA leads.

Chronic beta-adrenoceptor blockade is known to improve outcome of high risk patients whereas amelioration of autonomic activity was demonstrated to be a major cause of outcome improvement. Therefore, perioperative beta-adrenoceptor blockade is recommended in patients with Revised Cardiac Risk Index score of three or greater. The investigators hypothesise that preoperative intravenous beta-adrenoceptor blockade for treatment of hypertension and/or tachycardia improves autonomic activity reflected by increase of Total Power of Heart Rate Variability. Material and Methods: After IRB approval 20 patients scheduled for elective cardiac surgery were included into the study. Routine medication was continued throughout the study as recommended by the guidelines. HRV (TP and Low to High Frequency ratio (LF/HF) reflecting sympathetic to parasympathetic balance) was analysed prior to induction of general anesthesia and beta-adrenoceptor blockade in all patients (Baseline). Patients were assigned by their baseline hemodynamics. Patients with hypertension (systolic blood pressure > 140mmHg or diastolic blood pressure > 90mmHg) or tachycardia (heart rate > 80bpm) were assigned to group BETA-BLOCK. In this group metoprolol-boli (2mg) were administered intravenously in stepwise manner until hemodynamic values decreased to normal. Total dosage was recorded. After normalisation of hemodynamics, second HRV analysis was performed (Intervention). Normotensive and normocardic patients were assigned to group CONTROL. No intervention was performed. Statistics: Mann Whitney U test for comparison between groups and between events Baseline and Intervention within group BETA-BLOCK, p<0.05.

To generate a list of potential genetic markers that correlate with an increased risk of life-threatening arrhythmias. To evaluate ECG-based risk markers such as heart rate variability and T-wave Alternans for their association with arrhythmic events.

The purpose of this study is to determine if heredity influences the risk of life-threatening heart rhythms (ventricular tachycardia and ventricular fibrillation) after heart attack (myocardial infarction).

This study evaluates the date of the first appropriate and/or inappropriate therapy in patients implanted with a Guidant PRIZM or VITALITY defibrillator and is evaluating eventual predictive risk factors for appropriate/inappropriate therapies as well as the influence of the programmed parameters on these therapies.

The SWAF study will compare the performance of a smartwatch combined with Cardiologs Platform algorithm in the detection of Atrial Fibrillation and other arrhythmias with that measured on a manually read 12-lead ECG in subjects hospitalized for cardioversion or AF ablation.