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 purpose of this project is to study DNA and its connection to your health. DNA is in your blood, your saliva, and other tissues in your body. DNA is the unique instructions you are born with that tells your body how to work. By looking at DNA, you can learn information about your health, certain traits, and even your ancestral roots. DNA is also called your genetic information. DNA is mostly the same from person to person. But everyone's DNA is slightly different. We are still learning how DNA impacts health. This study will look at the DNA of many different people from many different backgrounds and compare it to information in their health records. The goal is to understand how learning about DNA can help improve health care for individuals, families, and the community.

Participants will provide a sample for DNA sequencing. Sequencing is the process of reading the letters of your DNA. This study may sequence your whole genome. Over time, you may be asked to provide additional samples for research purposes. The research team will collect health information about you from your medical record and may ask you questions about your health using surveys or other data collection method.

The purpose of this project is to study DNA and its connection to your health. DNA is in your blood, your saliva, and other tissues in your body. DNA is the unique instructions you are born with that tells your body how to work. By looking at DNA, you can learn information about your health, certain traits, and even your ancestral roots. DNA is also called your genetic information. DNA is mostly the same from person to person. But everyone's DNA is slightly different. We are still learning how DNA impacts health. This study will look at the DNA of many different people from many different backgrounds and compare it to information in their health records. The goal is to understand how learning about DNA can help improve health care for individuals, families, and the community.

Participants will provide a sample for DNA sequencing. Sequencing is the process of reading the letters of your DNA. This study may sequence your whole genome. Over time, you may be asked to provide additional samples for research purposes. The research team will collect health information about you from your medical record and may ask you questions about your health using surveys or other data collection method.

The purpose of this project is to study DNA and its connection to your health. DNA is in your blood, your saliva, and other tissues in your body. DNA is the unique instructions you are born with that tells your body how to work. By looking at DNA, you can learn information about your health, certain traits, and even your ancestral roots. DNA is also called your genetic information. DNA is mostly the same from person to person. But everyone's DNA is slightly different. We are still learning how DNA impacts health. This study will look at the DNA of many different people from many different backgrounds and compare it to information in their health records. The goal is to understand how learning about DNA can help improve health care for individuals, families, and the community.

Participants will provide a sample for DNA sequencing. Sequencing is the process of reading the letters of your DNA. This study may sequence your whole genome. Over time, you may be asked to provide additional samples for research purposes. The research team will collect health information about you from your medical record and may ask you questions about your health using surveys or other data collection method.

The purpose of this study is to evaluate the safety and effectiveness of ION-682884 and determine if it can help people with transthyretin-mediated amyloid cardiomyopathy (ATTR-CM) which is a disease caused by change in a protein called transthyretin (TTR). ION-682884 is an investigational drug. "Investigational" means that ION-682884 is not yet approved for use in any settings outside of clinical research studies like this one and is considered experimental. ION-682884 has been shown to reduce the level of TTR in the blood of animals and healthy volunteers tested to date. Reducing the amount of TTR in your blood may reduce the amount of amyloid deposits in your body and may keep your cardiomyopathy from getting worse over time. However, it is not known if ION-682884 will help your cardiomyopathy.

If you meet the requirements and agree to participate in this study, you will receive subcutaneous (under the skin) injections of either ION-682884 or placebo once every 4 weeks from week 1 through week 137.
Your participation in this study will last up to 36 months and will consist of clinic visits and follow up visits at home.