Active clinical trials for "Tachycardia"

The clinical study is intended to implement and test the collection and analysis of paired ECG data from the HeartWatch and two comparator devices, an Event Recorder and Holter. The HeartWatch is indicated for extended diagnostic evaluation of patients with transient symptoms of possible cardiac origin such as syncope and palpitations, as well as patients at risk for arrhythmias, but without significant symptoms. While the use of the device itself can be managed by both healthcare professionals and patients, interpretation of the collected data for diagnosis is restricted to healthcare professionals, as the data must be loaded and analyzed separately after recording. Patients indicated for extended ambulatory ECG testing will be approached for participation. Subjects will wear the HeartWatch and an Event Recorder for up to 72 hours or the HeartWatch and Holter monitor for up to 48 hours. Subjects will be asked to document their activities (standing, sitting, walking, exercise, or laying down). Event recorder subjects will collect user-triggered and auto-triggered data, while Holter subjects will record diary information on their activities and any relevant symptoms. Adverse events and user preference for one device versus the other being used in that arm will also be collected from all subjects. Paired ECG data from the HeartWatch and comparator devices is expected to be similar in terms of the events documented and the proportion of data that is clinically interpretable.

Pilot-case-control study on exertion and orthostatic intolerance of adolescents with myalgic encephalomyelitis/ chronic fatigue syndrome (ME/CFS) compared to age-matched healthy controls (HC).

SCORE is an active, prospective, non-randomized, multi-center outcome-oriented registry of patients implanted with St Jude Medical (SJM) market-released cardiac rhythm management (CRM) products. This registry will be conducted in the United States (US). The primary purpose of the registry is to evaluate and publish acute and long-term performance of market-released SJM CRM products by analyzing product survival probabilities. Product status and any related adverse events will be collected to measure survival probabilities.

This is an observational registry study aiming to collect data on efficacy and safety of the single chamber Biotronik DX system with enhanced atrial diagnostics. The minimal follow-up period is 24 months. All analyses on the data will be done post-hoc; the study does not intend to confirm any pre-specified hypotheses.

Patients sometimes suffer from life-threatening abnormal heart racing that originates from the lower chamber of the heart. These patients will often need an implantable defibrillator which has the ability to shock the heart back to a normal heart rhythm, but this does not prevent them from getting frequent recurrences of the bad heart rhythm needing shocks from the device. This can be painful and potentially harmful. Medicines to prevent recurrences of shocks are not very effective and have many side effects. An alternative to medicines for this is a procedure called a catheter ablation in which a wire is passed up through the blood vessels of the leg into the heart and used to find the short circuits which cause the dangerous heart rhythm. When the spot causing the trouble is found, the investigators can burn it ("ablate" it). This procedure is challenging and methods are needed to make it more effective and easier to do. One of the main ways for finding the short circuits involves using the electrocardiogram (the "ECG"). The regular ECG is simplistic and only makes use of recordings from 10 sites (6 precordial sites and 4 sites on both upper and lower limbs) on the body surface. The investigators are testing whether making recordings from 120 sites on the chest and back and using special computerized analysis of the recordings can help make catheter ablation for dangerous heart rhythms more effective.

Atrioventricular nodal reciprocating tachycardia (AVNRT) and atrioventricular reciprocating tachycardia (AVRT) are two similar supraventricular re-entry tachycardias (SVT) emerging in relatively young age in patients without apparent structural heart disease or significant comorbidities. The treatment of choice in those patients is radiofrequency ablation (RFA). The PPRA study is a prospective observational study developed to thoroughly analyze quality of life, utility and willingness-to-pay of Polish patients undergoing RF ablation of AVNRT or AVRT. Based on collected data the investigators will prepare a profile of patient who will benefit most from radiofrequency ablation and who should be scheduled in first place for the ablation in case of problems with accessibility to this service. What is more an analysis of medical and indirect costs of care will be performed.

The objective of this study is to confirm the safety and efficacy of the new Sentus OTW QP LV lead and Iperia ICD family. The study focuses on the safety and efficacy of the QP device system.

The purpose of this study is to determine whether levels of inflammatory markers in circulating blood can correlate with risk for dangerous heart rhythms. Patients with systolic heart failure, which has been shown to increase risk for dangerous heart rhythms, will be enrolled. All subjects will have an implantable cardioverter-defibrillator (ICD) in place, which allows regular evaluation of heart rhythm.

Implantable cardioverter defibrillators (ICD) may have the capacity to provoke or worsen ventricular tachyarrhythmias (VT). It has been reported that ICD shocks by itself can increase mortality. This study aimed to determine the role of back-up pacing-induced VT (PIT) to the overall ICD shock burden by avoiding pause-related ventricular back-up pacing by programming the pacing output to a sub-threshold level for ineffective pacing.

The Magnetecs Catheter Guidance Control and Imaging (CGCI) system is a magnetic remote navigation system which is comprised of a magnetic chamber of eight electromagnets around the patient torso. The system can change the magnetic field almost instantaneously and enables almost real time manipulation of a special magnetic catheter (Maxwell mapping catheter) which results in accurate, repeatable, rapid and safe target acquisition within the four chambers of the human heart. The trial is a prospective, non-randomized, clinical one designed to test the study hypotheses of (a) technical equivalence of the study device in comparison to other magnetic remote navigation systems, (b) performance equivalence or non-inferiority of the study device target acquisition capability compared to presently used catheter navigation techniques, and (c) safety equivalence or non-inferiority of the study device in comparison to catheter navigation devices using other navigation techniques.