Active clinical trials for "Arrhythmias, Cardiac"

The present study will investigate a set of biomedical sensors with a wireless data communication system and evaluate the sensors' recording quality. The sensors and wearable wireless system have been approved by Food and Drug Administration (FDA) for recording Electrocardiography (ECG), Trans Thoracic Impedance (TTI), Heart Sounds and Acitigraphy. The sensors and wireless system will be used along with conventional sensor systems (as intended to be used).

The purpose of the study is to determine if the Electrocardiograms (ECGs) and symptoms data obtained from an Apple Watch and transmitted to Mayo Clinic are of sufficient quality to guide a person's care.

The main aim of the research is to investigate whether patients undergoing pulmonary vein isolation with catheter ablation for persistent atrial fibrillation (AF) will have lower rates of AF recurrence than those treated by DC cardioversion without an ablation procedure.

The objective of the study is to evaluate the efficacy of monitoring after discharge of patients with high-risk acute coronary syndrome.

Background: Exposure to high altitudes has been associated with an increased risk of cardiac arrhythmias in healthy subjects and an increased risk of sudden cardiac death. Aim: The aim of the present study is to evaluate the risk and the incidence of cardiac arrhythmias at extreme altitude. Methods: This is a prospective cohort study of healthy volunteers determined to climb Mount Everest. Subjects will be evaluated for eligibility by electrocardiography and echocardiography. All study participants will undergo ambulatory rhythm monitoring in their home environment within 12 weeks of the climb. Subsequently, ambulatory rhythm monitoring will be repeated during the ascent from basecamp to the summit of Mount Everest. The primary endpoint will be the composite of supraventricular and ventricular tachyarrhythmias, and bradyarrhythmias.

Treatment of ventricular arrhythmias (VA) originating at the base of the heart may be challenging. Unipolar radio-frequency (RF) ablation is a standard approach to treat VA, however, it fails in 10 to 75% of patients, depending on the localization of VA. The main reason for unipolar ablation failure is the intramural location of the source of VA. In such patients, bipolar ablation may occur effective. However, there are no prospective studies or registries on consecutive patients wilt failed unipolar ablation, therefore, the proportion of candidates for bipolar ablation after failed unipolar approach is not known. Also, invasive electrophysiological parameters associated with successful unipolar and bipolar ablation have not been well established. It has been hypothesised that (1) bipolar ablation fails in 12-75% (mean 30%) of consecutive patients and these patients are candidates for bipolar ablation, (2) local ventricular signal precocity > 20 ms, unipolar signal without R wave and pace mapping 12/12 predict effective unipolar ablation but not bipolar ablation, (3) morphology of VA from surface ECG can identify patients with possible intramural localization, and (4) successful ablation results in improvement of quality of life (QoL). Aims: To assess how many patients after failed unipolar ablation need redo procedure with bipolar ablation (primary end-point) To assess which intraprocedural electrophysiological parameters predict success during standard unipolar ablation (secondary endpoint) To assess short term efficacy of bipolar ablation (secondary endpoint) To assess one-month efficacy of bipolar ablation (secondary endpoint) To assess which intraprocedural electrophysiological parameters predict success during redo bipolar ablation (secondary endpoint) To evaluate the performance of ECG-based algorithms in predicting the localization / origin of VA, especially of transmural origin (secondary endpoint) To assess the effects of ablation on QoL (secondary endpoint)Methods. The study group consists of all consecutive patients who underwent unipolar ablation of VA originating from the base of the heart in the Grochowski Hospital and collaborating centres. All these patients are referred to Grochowski Hospital for further follow-up and treatment if needed, including bipolar ablation if initial unipolar approach failed. In all patients acute and one-month efficacy of unipolar and bipolar ablation is assessed.

The objective of this observational study is to assess clinical benefits of innovative features (e.g. Bluetooth technology and smartphone patient applications) in a patient population that is implanted with standard indication for implantable cardiac defibrillator.

Research objective. - To study the associations between combinations of single nucleotide polymorphisms and behavioural risk factors with non-communicable diseases and adverse outcomes in women with premature ovarian failure. Research objectives: To study the associations between combinations of single-nucleotide polymorphisms and behavioural risk factors with heart rate disorders and adverse outcomes in women with premature ovarian failure Examine the associations between combinations of single nucleotide polymorphisms and behavioural risk factors with stable STIs in women with premature ovarian failure. Examine the associations between combinations of single nucleotide polymorphisms and behavioural risk factors with thrombomolia in women with premature ovarian failure Study the associations between combinations of single nucleotide polymorphisms and behavioural risk factors and adverse cardiovascular outcomes in women with premature ovarian failure.

Ventricular tachycardia and ventricular fibrillation (VT/VF) are the most common causes of sudden cardiac death in patients with diseased hearts. The factors contributing to these deadly arrhythmias are not well understood. The presence of a wide variety of microbial flora in the human GI tract, particularly colon has been well recognized for a long time. There are also emerging links showing the effect of an intact gut microbiome having effects on left ventricular remodeling after myocardial infarction and hypertension. Gut microbiota has also been associated with outcomes in atrial fibrillation. There is little available in current literature showing a relationship between gut microbiome characteristics and ventricular arrhythmia burden. The gut microbiome has particularly strong interactions with neuroendocrine and immunologic mediators and has effects on the modulation of the autonomic nervous system. These systems are also hypothesized to influence ventricular arrhythmias. The investigators propose to study the relation and interaction between gut microbiome and ventricular arrhythmogenesis.

The primary objectives for the registry is to evaluate the overall incidence of serious complications or adverse events for primary implants and replacement devices, and assess the cost and time efficiency for both physicians and patients. The Registry is a multi ASC data collection registry. Data collection will occur at the time of screening, implant, and 2 weeks after implant at the time of wound check.