Fontan Procedure

The goal of this research is to validate novel non-invasive Magnetic resonance imaging (MRI) biomarkers to detect Gastroesophageal varices (GEV) in patients with cirrhosis, including fractional flow change in the portal vein and elevated azygos flow. End-stage liver disease (cirrhosis) is characterized by advanced fibrosis, liver failure, and portal hypertension. There are many causes of cirrhosis, including viral hepatitis, alcohol abuse, and perhaps most importantly, non-alcoholic fatty liver disease (NAFLD) and its aggressive subset, non-alcoholic steatohepatitis (NASH). 3 million new cases of end-stage liver disease (cirrhosis) are expected over the next decade. In cirrhosis, portosystemic collaterals that shunt blood away from the liver develop due to increased portal pressure. Gastroesophageal varices (GEV) are the most clinically relevant because they can cause fatal internal bleeding. GEV bleeding carries \~20% mortality at 6 weeks, and \~34% overall mortality. Identification of at-risk varices, prior to bleeding, is of paramount importance to initiate primary prophylaxis. To identify and treat at-risk patients, current guidelines recommend regular esophagogastroduodenoscopy (EGD) and variceal band ligation. Detection of high-risk GEV is key to initiating primary prophylaxis, which can reduce mortality by 50-70%. However, endoscopy is invasive and often unnecessary when no treatment is required. Therefore, the American Association for the Study of Liver Diseases has identified the development of "non-invasive markers that predict the presence of high-risk varices" as a major unmet need.

Young adults with heart failure, including those who have undergone a heart transplant, experience considerable psychosocial stressors associated with living with a chronic illness, including heightened levels of anxiety and depression, and poor health-related quality of life compared to 'healthy' peers. Psychosocial challenges during young adulthood are especially concerning as this life stage represents a unique transitional period for fostering self-identity, friendships, mastery, and decision-making competencies. As young people with heart failure transition into adult healthcare systems, they take on greater personal responsibility due to their increasing independence and involvement in care decisions, and require more support and resources to live longer, healthier lives. Peer support provided by a person with a similar experience has been found to improve disease self-management and psychosocial health outcomes in pediatric healthcare. An established, online mentorship program, iPeer2Peer (iP2P), will be employed through a pilot feasibility waitlist randomized controlled trial with repeated measures across five sites. Sixty mentees will be recruited and randomized into intervention and control groups. Thirty mentees in the intervention group will be matched 1:1 with 20 trained mentors. These pairings will connect over 12 weeks through video calls and text messaging to provide peer support to improve self-management and psychosocial health outcomes.