Active clinical trials for "Bradycardia"

This is a pilot study into the effects on heart function when pacing the right ventricle (RV). This study aims to enrol a population with structurally normal hearts. The investigators aim to measure heart function directly when pacing. When normal conduction within the heart fails, the treatment may be to implant a permanent pacemaker. Pacing involves passing a lead via a vein to the heart and using an electrical impulse to stimulate a beat. The usual site for pacing is the tip of the RV. This has been shown to be less efficient than the normal conduction system of the heart and in some cases leads to markedly reduced function. What the investigators do not know is why this is the case. Much effort has been directed at looking at features within the left ventricle (LV) for markers of disease progression but little has been investigated regarding the RV. There may be some benefit to pacing the heart preferentially from different parts of the RV and the investigators aim to measure if any differences are detectable from stimulating the heart at various sites within the RV.

Safety and effectiveness will be summarized for the model 4965 lead. This study was conducted within Medtronic's System Longevity Study (SLS).

This is a clinical investigational plan (CIP) for the "Clinical Study to Confirm MRI Safety and Effectiveness Using SJM Cardiac Rhythm Management Systems (ASSURE MRI)". This study intends to enroll patients who meet standard bradycardia or tachycardia indications and have already been implanted with one of the SJM device/lead combinations listed in this protocol. The objective of this study is to confirm the safety and effectiveness of each of the four SJM device/lead combinations in an MRI environment. This clinical investigation is sponsored by St. Jude Medical.

The objective of this study is to assess the accuracy of the Apple Watch 4 Series watch in generating an ECG that is suitable for determination of heart rhythm compared to rhythms monitored via telemetry. Secondary objective is to assess the accuracy of the Apple Watch 4 series watch in identifying atrial fibrillation when it is present.

Heart rate (HR) is not routinely assessed during newborn resuscitations in low- and lower-middle income countries (LMICs). Many non-breathing newborns classified as fresh stillbirths have a heartbeat and are live born. The effect of a low-cost monitor for measuring HR on the problem of misclassification of stillbirths in LMICs is unknown. Knowledge of HR during newborn resuscitation might also result in timely administration of appropriate interventions, and improvement in outcomes. Helping Babies Breathe (HBB), a resuscitation algorithm developed by the American Academy of Pediatrics (AAP), is widely accepted as the standard of care for newborn resuscitation in low-resource settings. In keeping with the International Liaison Committee on Resuscitation (ILCOR) recommendations that HR be measured during newborn resuscitation, HBB calls for HR assessment after 1 minute of positive-pressure ventilation with good chest movement (or sooner if there is a helper who can palpate/auscultate heart rate). However, given the frequent reality of a single provider attending deliveries in LMICs, as well as the currently available methods for assessing HR (i.e. palpitation or auscultation), assessment of HR is challenging to perform without delaying or stopping the provision of other life-saving interventions such as bag and mask ventilation. The effect of low-cost, continuous HR monitoring to guide resuscitation in these settings is unknown. NeoBeat is a low-cost, battery-operated device designed by Laerdal Global Health for the measurement of newborn HR. The device can be placed rapidly on a newborn by a single provider, and within 5 seconds, displays HR digitally. A preliminary trial of NeoBeat in 349 non-breathing newborns in Tanzania detected a HR in 67% of newborns classified as stillbirths, suggesting up to two thirds of fresh stillbirths may be misclassified in similar settings. This trial will evaluate: 1) the effectiveness of HBB in combination with NeoBeat for vital status detection on reduction of reported stillbirths, and 2) the effectiveness of HR-guided HBB on effective breathing at 3 minutes. The primary hypothesis is that implementation of HBB with measurement of HR using NeoBeat will decrease the reported total stillbirth rate by 15% compared to standard care. The secondary hypothesis is that implementation of HR-guided HBB will increase the proportion of newborns not breathing well at birth who are effectively breathing at 3 minutes by 50% compared to HBB with NeoBeat.

The objective of this post-market, clinical follow up (PMCF) study, is to confirm the long-term safety of the Tendril STS and Isoflex leads, implanted with the Assurity MRI™ or Endurity MRI™ pacemakers, in patients undergoing a clinically indicated 3T MRI (3 Tesla Magnetic Resonance Imaging) scan.

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.

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.

The purpose of this observational study is the assessment (safety and efficacy) of the St. Jude Medical Tendril MRI™ leads. The Tendril MRI™ leads are a full part of the Accent MRI™ System, consisting of Tendril MRI™ leads and Accent MRI™ pacemaker. The subject population includes patients with a standard bradycardia pacing indication.

The primary objective of this study is to document the success rate of the automatic threshold testat pre-discharge in a normal pacemaker patient population implanted with Guidant Insignia Ultra or AVT .