Active clinical trials for "Tachycardia, Ventricular"

The Physiologic Pacing Registry is a prospective, observational, multi-center registry performed to gain a broader understanding of 1) physiologic pacing implant and follow-up workflows, including pacing and sensing measurements and 2) the clinical utility in creating a 3-dimensional electro-anatomical map of cardiac structures prior to physiologic pacing device implants based on the clinical site's routine care.

This is a retrospective, multi center clinical study collecting existing, de-identified subject data from medical records to be analyzed using an independent core laboratory to validate performance of a computational ECG mapping system (vMap™).

The COGENT-4 Field Following Study will evaluate the clinical performance of the Boston Scientific TELIGEN 100 HE Implantable Cardioverter Defibrillator (ICD), the COGNIS 100 HE Cardiac Resynchronization Therapy ICD (CRT-D) systems and the RELIANCE 4-SITE defibrillation lead (when available). An optional sub-study will also evaluate the clinical performance of the Reverse Mode Switch (RMS) feature in the TELIGEN 100 HE DR ICD.

The purpose of this study is to determine, among a large cohort of 300 consecutive patients with hypertrophic cardiomyopathy, if extended ambulatory monitoring using the iRhythm Technologies, Inc. Zio XT device results in identifying a greater burden of nonsustained ventricular tachyarrhythmia (nsVT) compared to current ACCF/AHA guideline recommended 48-hour monitoring.

Use lay language. Current guidelines regarding physical activity in patients with inherited arrhythmia and cardiomyopathy are mostly dedicated to adult patients, with a special focus on sports competition. Their application to the pediatric population has been scarcely evaluated. Physical activity is well known for its health benefits but may be dangerous in this population, which leads to confusion within the medical community and among patients. Actual physical activity of children with such inherited cardiac disorders is unknown. This study aimed to assess the level of physical activity in children with inherited arrhythmia and cardiomyopathy, and the adherence to the current European guidelines on the subject. Secondary objectives aimed to assess through a qualitative analysis the impact of the disease on physical activity and daily life in this population. The level of physical activity and adherence to current guidelines will be determined from interviews between the patient and the principal investigator. Each patient will be questioned in order to explore the experiences, motivations and feelings of participants regarding physical activity. The standardized questionnaire was created by the principal investigator and members of the clinical research team. The investigators believe that many children practice physical activity outside the current guidelines and hope to identify the main determinants of physical activity in this population.

Local abnormal ventricular activity (LAVA) is composed of high-frequency, mainly low voltage signals that represent near-field signals from slow-conducting tissue and thus potential VT isthmuses. The identification of LAVA potentials and their modification have usually been a complimentary component of the substrate-based modification of scar related ventricular arrhtyhmias. With better identification through technical solutions and improved algorithms, LAVA modification may be feasible for treatment in therapy refractory VT.

Cardiac pacing which involved stimulating the heart electrically with electrical wires that go into the heart is routine practice in the diagnosis and treatment of heart rhythm problems. Clinically this involved the fields of cardiac pacing and electrophysiology. Patients who are at risk of sudden death because of serious heart rhythms that are a result of malfunction of the electrical system of the pumping chambers of the heart (ventricles) are generally implanted with specialised pacemakers that can defibrillate (shock) the heart if a nasty life threatening rhythm should result. Shocks are painful and in order to try and treat these rhythms without shocks, anti tachycardia pacing is performed (this is routine part of the device), which aims to interrupt the rhythm by stimulating the heart electrically. This does not always work and can destabilise the rhythm leading to a shock. REVRAMP is a novel modification of anti tachycardia pacing which involved stimulating the heart through the defibrillator wires in a different way. It appears to work better and seems less likely to destabilise the heart rhythm, hence can reduce painful shocks.

Ventricular tachycardia (VT) is a life-threatening, fast heart rhythm that starts in the lower chambers of the heart (the ventricles). This fast heartbeat is caused by abnormal electrical pathways located in the heart tissue. A standard procedure called a catheter ablation has been used for several years to help correct these abnormal pathways and, in some cases, improve or even eliminate the ventricular tachycardia. During a VT ablation it is routine to monitor your vital signs (blood pressure, heart rate, and oxygen saturation in your blood). If you choose to participate in this study we will also monitor your cerebral oximetry, the amount of blood flow and oxygen saturation to your brain during the ablation. By doing this study, we hope to have a better understanding of patients' blood and oxygen flow to their brain during an episode of Ventricular Tachycardia (VT).

This study involves recording electrical signals inside the heart during an ablation procedure. It is thought that by studying these electrical signals in detail the investigators may be able to better identify and treat patients at risk of Ventricular Tachycardia (VT). VT is where the lower chambers (ventricles) of your heart beat fast and this condition can be life-threatening. An ablation procedure is performed in patients who have VT despite the best treatment available with tablets. Cardiac ablation involves interrupting the abnormal electrical signals, which cause VT, by applying a type of electrical energy through a catheter. An important part of the ablation procedure is the identification of the exact part of the heart muscle responsible for causing the VT. This typically involves sampling the electrical signals in lots of different areas of the heart, which allows the construction of computer generated 3 dimensional pictures of the structure and the electrical circuits inside the ventricle. Recent research has identified a new method to interpret these electrical signals (called Fibrillatory Factor - FF), which may allow better identification of the area within the ventricle that should be ablated. A standard VT ablation will often involve us controlling the heart-beat by pacing the heart through 1 of the investigators catheters within the heart. The electrical response to pacing at different heart rates can often provide your doctor with information to help the ablation. This study will involve an additional period of pacing at different heart rates, during which the electrical response is measured in different areas around the ventricle. This will allow us to calculate areas of the ventricle, which the investigators new measure FF would predict to be the source of the VT. In the future this may then allow us to better identify patients who are at risk of VT, and to better locate the area that needs to be ablated.

The purpose of this clinical study is to collect simultaneous, multiple view cardiac signals representing both transvenous ICDs (T-ICD) and sensing vectors from the subcutaneous implantable defibrillator system (S-ICD). Upon completion, this data will represent the first true database capable of comparing detection characteristics of transvenous and subcutaneous ICDs. Future protocols will be created to dictate the specific methods of such comparisons.