Active clinical trials for "Tachycardia"

Retrospectively review the charts of all children who had heart rate variability, deep breathing test, valsalva maneuver, tilt table test, thermoregulatory sweat testing, quantitative sudomotor axon reflex test (QSART) completed and were cared for at Children's Hospital of Wisconsin.

Heart failure with preserved ejection fraction (HFPEF) is a large medical problem, for which no drug or device has a recommendation in current heart failure guidelines. Sudden cardiac death is suggested as the most common cause of death in HFPEF patients, although data is sparse. Use of an Implantable Loop Recorder (ILR) may be useful in patients with HFPEF to evaluate the incidence of sustained ventricular tachyarrhythmias. If ventricular tachyarrhythmias are seem frequently, treatment with an Implantable Cardioverter Defibrillator (ICD) may be an option in the future.

The Medtronic Market-Released DF4 Lead Imaging Study is a prospective, non-randomized study, multi-center clinical investigation. The purpose of this clinical investigation is to collect high quality medical images of the Medtronic Market-Released DF4 lead in the shoulder and heart. Images collected during the study will allow for lead design and testing processes better tailored to the implanted environment.

This study will test the ability of computer algorithms to predict successful ablation therapy for atrial arrhythmias.

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.

The investigators aim to study whether the Compensatory Reserve Index (CRI) (an FDA approved device that assesses intravascular volume) can be used to evaluate severity of Postural Orthostatic Tachycardia Syndrome (POTS) and whether the CRI value has a correlation with severity of psychosocial symptoms and functional impairment associated with POTS.

Following product approval, confirmation of appropriate VF episode detection after MRI exposure of the ProMRI ICD/CRT-D systems and to evaluate left ventricular pacing threshold changes post-MRI.

Prospective observational clinical study to verify an algorithm used to predict cardiopulmonary events in patients presenting to the emergency department.

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™).

Determine the accuracy of the NTX wireless monitoring system alerts Evaluate patient compliance with wearing device Determine false alarm rates