This research is being done to assess whether it is safe and effective to stop oral anticoagulation medications (a blood-thinning medication) during prolonged periods of normal heart rhythm in participants with infrequent episodes of atrial fibrillation (AF).

You may qualify for this study if you have a history of atrial fibrillation (AF) and are currently taking an oral anticoagulant (a blood-thinning medication). You will be randomized to one of two groups: Control Group or Study Intervention Group.

If you are randomized to the Control group, you will be asked to stay on your previously prescribed oral anticoagulant. If you are randomized to the Study Intervention group, you will be asked to take the oral anticoagulant for 30 days only if a prolonged episode of AF is detected on an AF-sensing Apple smartwatch you will be provided.

This study is seeking participants with arrhythmogenic cardiomyopathy (ACM), also known as arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C), due to a genetic abnormality known as a PKP2 variant. ARVD/C is an inherited disease where the muscle tissue in the right ventricle, one of the lower pumping chambers of the heart, dies and is replaced with scar tissue. This causes a weakened heart muscle and disrupts the heart's electrical system which can lead to heart failure and/or fatal heart rhythms. This study is looking at the safety and effectiveness of an investigational medication, meaning it is not yet approved for use by the Food and Drug Administration (FDA). The study medication is a gene therapy called LX-2020, and is designed to add new PKP2 genes to replace the faulty ones so your cells can make the correct PKP2 genes. The study medication is given via an intravenous (IV) line meaning in a vein. Participation in this study involve up to 25 visits including a hospitalization over the course of 1 year with an additional 4 years of follow up afterwards. Study related procedures include a variety of heart testing like electrocardiogram (ECG), echocardiogram, a test that records a tracing of the heart's electrical activity, Echocardiogram, (echo) a test that uses ultrasound to capture moving images of the heart, magnetic resonance imaging (MRI), a test that shows an image of the heart and surrounding structures, sample collection including blood, urine, tissue, nasal mucus, saliva and stool, liver ultrasound, questionnaires, physical exams, and at least a two night stay in the hospital. Medications to suppress (meaning weaken) the immune system, before receiving the LX2020 are also required. Risks associated with gene therapy include an immune response that may cause inflammation in the liver, heart or other organs. It may damage red blood cells, cause a low platelet count or cause the formation of small blood clots. There are also risk related to the study procedures including bleeding associated with the heart biopsy, risks related to drawing blood, risks of radiation, and loss of confidentiality. There is potential benefit and in the future, others with ACM may benefit from the knowledge gained from this study.

The study uses a monitoring system to measure pressures inside the heart and lungs in a non-invasive way. This monitoring system consists of a handheld electronic device, similar to a smartphone, which will be placed on the chest and a smartwatch to wear on the wrist. Ultimately, the monitoring system will be intended to be used by doctors as a tool to support them when assessing patients with symptoms that may be due to a condition of their heart and/or lungs.

The purpose of this study is to collect data from eight sensors built in the study device (the smartphone and the watch). The data collected from the device, as well as the data collected during your Right Heart Catheterization, will be uploaded in a database. Once all subjects have been enrolled in the study, these data are then used to build the software which will be used in the final monitoring system. The device used in this study is not approved for commercial use and can only be used in clinical investigations.

The purpose of the study is to evaluate the safety and how well the medication levosimenden works versus placebo in treating Pulmonary Hypertension and Heart Failure with a Preserved Ejection Fraction measured by a 6 minute walk. This is a condition where the lower left chamber (left ventricle) of the heart is not able to fill properly with blood during the filling phase and the amount of blood pumped out to the body is below normal. The study will also look at information obtained from the tests performed as part of the study to see if subjects have improvement in symptoms of heart failure. Levosimendan is a drug that has been FDA-approved for intravenous (IV) delivery to your body. This study aims to determine if the tablet form of the drug is as effective as the IV route. Tablets are much more attainable for patients to manage their heart failure from home, rather than going to an infusion clinic for treatments. Participation in this study will last approximately 12 weeks with the option to continue to the stage 2 phase of the study. If the stage 2 phase is selected as well, participation will last approximately 26 months or a little over 2 years. These visits will include such activities as blood tests, questionnaires, physical evaluation by a study doctor, echocardiogram, and 6 minute hall walks.

Participants will be randomized to either the treatment group (and receive the medication) or the control group (receive an inactive medication). Subjects will have a 50:50 chance of receiving the study medication during their participation in the trial. The treatment assignment is determined by randomization, where a computer selects at random which treatment group you will be in (like drawing straws). Neither the subject, nor the blinded personnel will know which group subjects are in. Neither the subject nor the study doctor will decide what group subjects are assigned.

The purpose of this study is to collect information about patients with Arrhythmogenic right ventricular cardiomyopathy(ARVC) and about the disease. ARVC is a rare condition that affects heart muscle and causes abnormal heart rhythms (this is called "arrhythmia"). Participation in this study will take about 5 years. If your study doctor determines you are eligible and you agree to participate, you will be asked to visit the study doctor's office as part of your regular care for a screening visit and about 1 time each year for the length of the study. The majority of the data collected for this study will be part of your regular care, however study related procedures include arrhythmia monitoring, using wearable devices to measure tracing of the electrical activity of your heart, blood work, including genetic testing, and patient questionnaires

The study will aim to link data collected during the DELIVER Randomized Contolled Trial (RCT) to Real World Data (RWD) during the 10 year period following subject participation in the clinical trial. Only individuals who participated in the DELIVER clinical trial will be approached to participate in this research. The study team will need to collect some of the subject's personal health identifiers. A research team at Brigham and Women's Hospital, the coordinating center for the DELIVER Trial, will then use the subject's personal identifiers to obtain data from subjects' health insurance and/or hospital systems.

A randomized clinical trial study that compares 2 different timepoints to clamp the cord at birth. The study involves babies with heart disease born between 37 0/7- 41 6/7 weeks of pregnancy. Doctors will clamp the umbilical cord around 30 seconds (between 1-<60 seconds) after birth vs. around 120 seconds (between 60-<180 seconds) after birth. Doctors consider both treatment groups to be "usual care." A goal of this study is to find out which umbilical cord clamping timepoint is best for babies with heart disease.

This is a study to evalaute the device's safety, function, and effects on heart function, and clinical outcomes of using the Edwards APTURE system (study device) in subjects with heart failure.

Major study activities include 3 right heart catheterizations (RHC) with exercise, a computed tomography (CT) scan with contrast, multiple ultrasounds of the heart, labs, and other assessments. The length of subject participation in the study is 5 years and includes 11 research visits.

The information obtained from this study will show how safe and effective this approach is in treating the symptoms of heart failure. Alternative treatment for heart failure depends on the cause, but may include diet and exercise, managing stress, medication (such as medications to treat leg swelling, high blood pressure, or abnormal heart rate), participation in another research study or continuing with current medical therapy

This study will include all adult (18 years or older) patients who received a heart transplantation at MUSC. This study will conduct a chart review of all adult heart transplant participants to understand how different variables including, donor and recipient comorbidities, donor and recipient medical history, donor and recipient social determinants of health, recipient length of time on transplant waitlist, donor cause of death (morbidity), donor conditions when harvested, recipient presence of mechanical circulatory support (MCS) (temporary or permanent), recipient reason for transplant, recipient use of inotropes and/or vasopressors, recipient pre-transplant lab values, recipient pre-transplant ECHO, recipient pre-transplant right heart catheterization (RHC), donor lab and test values, other donor and recipient imaging studies, recipient surgical time and patient stay data, donor-recipient prediction heart mass (PHM) ratio, recipient medications, donor medications, post-transplant follow-up data, as well as other donor and/or recipient variables, will affect heart transplant outcomes.

This study is for patients with obstructive hypertrophic cardiomyopathy (oHCM). oHCM is a condition where the heart muscle becomes abnormally thickened, which can sometimes block the blood flow out of the heart and results in the heart muscle working harder to pump blood to the body.

The study is done to compare the side effects and effectiveness of an investigational (not yet approved by the Food and Drug Administration (FDA)) medication with the beta-blocker metoprolol succinate in participants with oHCM. The study medication is known as Aficamten and is a tablet taken by mouth. This is a randomized study (participants will be assigned by chance to the study medication Aficamten and placebo or metoprolol succinate and placebo). A placebo looks just like the study medication but has no active ingredient in it. The medications will be administered in the form of a pill. This study will take about 9 months and include about 11 visits to the study site. Study related procedures include blood work, echocardiograms (ultrasound test of the heart), electrocardiogram (recording of heart's electrical activity), exercise testing, physical exams, questionnaires and optional genetic testing. Risks associated with this study include shortness of breath, nausea, diarrhea, headaches and dizziness.