Clinical trial NCT04764305: Liver Disease, Myocardial Fibrosis and Collaterals in the Adult Fontan Patient a Metabolomics and Proteomics Approach
Official title: Liver Disease, Myocardial Fibrosis and Collaterals in the Adult Fontan Patient - a Metabolomics and Proteomics Approach
Study type: OBSERVATIONAL
Overall status: RECRUITING
Conditions: Patient Participation
Heart Defects, Congenital
Liver Diseases
Collateral Circulation, Any Site
Myocardial Fibrosis
Keywords: Fontan
congenital heart disease
inflammation
Fontan-associated liver disease
Myocardial fibrosis
Collateral vessel
Lead sponsor: Medical University Innsbruck
Sponsor class: OTHER
Collaborators: name: Heart and Diabetes Center North Rhine-Westphalia
name: Austrian Science Fund (FWF)
First posted: 2021-02-21
Enrollment: 300
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Adult patients with Fontan circulation, see inclusion criteria. Healthy, biventrucal age- and sex-matched controls.

Brief summary: Out objective is to identify the mechanisms that promote hepatic and myocardial fibrosis, and collateral vessel formation in patients with complex congenital heart disease and Fontan circulation.

Detailed description: In their prior works the investigators could show that there is evidence of a proinflammatory condition in a certain subgroup of patients with complex congenital heart disease and a so called Fontan circulation. Those patients are also prone to develop hepatic and myocardial fibrosis as well as to reveal collateral vessel formation. The investigators' hypothesis is that this pro-inflammatory condition is not only reflecting pre-stages of one or more of those 3 issues, but that this is also a main driving mechanism to develop and hepatic or myocardial fibrosis and collateral vessels.

The objective of the here proposed study thus is to identify the mechanisms that promote hepatic and myocardial fibrosis, and collateral vessel formation, and thus provide insight into the determination of those Fontan patients that tend to develop those conditions. The investigators attempt to link the issues of hepatic and myocardial fibrosis and collateral vessel formation by directing our focus on the phospholipid, amino acid and bile acid metabolism and on cell surface markers, cytokines, and chemokines as surrogates for proinflammatory, profibrotic and proangiogenic conditions.

This study would thereby allow for a deeper insight into Fontan pathophysiology and sequelae and might provide first steps towards the identification of possible diagnostic or eventually therapeutic targets.

Eligibility criteria: Inclusion Criteria:

* written informed consent of participants
* age at testing of ≥18 years
* 8 h fasting before blood sampling
* Fontan circulation (patients)
* biventricular heart without structural or functional abnormality (controls)

Exclusion Criteria:

* Protein losing enteropathy (PLE) (patients are defined as "PLE positive" if there is/are serum protein \<5g/dL and serum albumin \<3g/dL (duration for more than 3 months and exclusion of other causes for hypoproteinemia) and documented enteric protein loss: faecal alpha-1-antitrypsin ≥400 µg/g
* medication directly affecting metabolic state, such as cholesterol-lowering agents, or haemodynamic state, such as beta-blockers or sildenafil, with the exception of angiotensin converting enzyme inhibitors, diuretics, and anticoagulants
* atrial or ventricular arrhythmia
* coronary artery disease (history of myocardial infarction, myocardial revascularisation, percutaneous coronary intervention, or coronary artery bypass surgery)
* any metabolic disease, such as diabetes mellitus
* malignancy
* obesity (body mass index (BMI) \>25 kg/m2)
* underweight (BMI \< 18 kg/m2)
* renal disease
* inflammatory disease such as acute or chronic infection
* myeloproliferative disorder
* pregnancy or lactation
* malnourishment
* mental handicap not allowing valid consent to participation in the study or CMR
* need of sedation or general anesthesia for CMR
* typical contraindications for performing CMR such as metal-containing mechanical or electronic implants
* claustrophobia

Primary outcomes:
measure: Number of participants
timeFrame: July 2021-December 2023
Secondary outcomes:
Other outcomes:
Locations:
city: Innsbruck
country: Austria
facility: Medical University of Innsbruck
Study officials:
affiliation: Medical University of Innsbruck
name: Miriam Michel, MD
role: PRINCIPAL_INVESTIGATOR
References: