Genes Associated With Development of Pulmonary Arterial Hypertension in Patients With Congenital Shunt Lesions

Prospective, Monocentric Pilot Study for the Identification of Known or Novel Genes Associated With Development of Pulmonary Arterial Hypertension in Patients With Congenital Shunt Lesions

Pulmonary arterial hypertension (PAH) in patients with congenital heart disease (CHD) is associated with considerable morbidity and even mortality.

Next to environmental risk factors, the investigators believe that there is an important role of genetic predisposition to develop PAH in CHD. There often is a discrepancy between the severity of PAH and the CHD, where it is useful to screen for PAH gene mutations. The investigators hypothesize that the genotype is partly responsible for the phenotypic variability in patients with congenital shunt lesions, where some develop PAH and others do not. If a genetic predisposition for PAH in CHD could be identified, then genetic screening could be a useful additional tool for early detection of patients at risk of pulmonary vascular disease and PAH development, with new opportunities for prevention or early treatment.

Study Overview

• Status: Recruiting
• Conditions: Pulmonary Arterial Hypertension; Heart Defects, Congenital; Genetic Testing
• Intervention / Treatment: Other: Genetic testing

Detailed Description

Pulmonary arterial hypertension (PAH) in patients with congenital heart disease (CHD) usually develops secondary to chronic volume overload of the pulmonary circulation following left to right shunt. This overload leads to elevated pulmonary artery pressure (PAP) and later to increased pulmonary vascular resistance. This causes pressure overload in the right heart, and thereby right ventricular and right atrial dysfunction, which may implicate considerable morbidity and even mortality.

Since PAH nowadays is mostly detected when symptoms occur and PAP are elevated, the disease already evolved to an advanced (partially irreversible) stage and treatment is often initiated too late.

Next to environmental risk factors, the investigators believe that there is an important role of genetic predisposition to develop PAH in CHD. In the past, certain genes have been identified that play a role in the development of atrial septal defect (ASD). There are also a lot of genes identified that play a role in PAH. Until now, not many research groups have studied a genetic link between CHD and PAH development. But it becomes more and more clear that there often is a discrepancy between the severity of PAH and the CHD, where it is useful to screen for PAH gene mutations. The investigators hypothesize that mutations in some of these known PAH genes or in other, still unidentified, genes are partly responsible for the phenotypic variability in patients with congenital shunt lesions, where some develop PAH and others do not. If a genetic predisposition for PAH in CHD could be identified, then genetic screening could be a useful additional tool for early detection of patients at risk of pulmonary vascular disease and PAH development, with new opportunities for prevention or early treatment.

• Study Type: Interventional
• Enrollment (Anticipated): 21
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Werner Budts, MD, PhD; Phone Number: +32 16 344369; Email: werner.budts@uzleuven.be
• Study Contact Backup: Name: Charlien Gabriels, MD; Phone Number: +32 16 341486; Email: charlien.gabriels@uzleuven.be

Study Locations

• Belgium
  • Leuven, Belgium, 3000
    • Recruiting
    • University Hospitals Leuven
    • Contact: Werner Budts, MD, PhD; Phone Number: +32 16 344369; Email: werner.budts@uzleuven.be
    • Contact: Charlien Gabriels, MD; Phone Number: +32 16 341486; Email: charlien.gabriels@uzleuven.be
    • Sub-Investigator: Charlien Gabriels, MD

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Previous diagnosis of secundum atrial septal defect (ASD) or ventricular septal defect (VSD), with or without repair
• Development of PAH, defined as mean PAP ≥ 25 mmHg by right heart catheterization, in combination with a pulmonary wedge pressure of ≤ 15 mmHg and a PVR (pulmonary vascular resistance) of > 3 Wood units
• Preferably, families with congenital shunt lesions (at least three family members affected with ASD or VSD) will be considered for inclusion

Exclusion Criteria:

• Other congenital heart disease
• Mental retardation
• Dysmorphic characteristics
• Chronic lung disease or total lung capacity < 80% of predicted value
• History of pulmonary embolism

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: Patients with ASD or VSD and PAH	Other: Genetic testing; Genetic testing by DNA sequencing on blood samples after DNA extraction

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Presence of pathogenic mutations in PAH or ASD genes	In a first step, known PAH genes (BMPR2, ALK1 and endoglin) will be screened for mutations.; In a second step, known ASD genes will be screened.; If step 1 and 2 remain negative, exome sequencing will be performed.	18 months

Collaborators and Investigators

• Sponsor: Universitaire Ziekenhuizen KU Leuven
• Investigators: Principal Investigator: Werner Budts, MD, PhD, Universitaire Ziekenhuizen KU Leuven

Study record dates

Study Major Dates

• Study Start: November 1, 2015
• Primary Completion (Anticipated): February 1, 2025
• Study Completion (Anticipated): February 1, 2025

Study Registration Dates

• First Submitted: February 17, 2016
• First Submitted That Met QC Criteria: February 20, 2016
• First Posted (Estimate): February 25, 2016

Study Record Updates

• Last Update Posted (Actual): May 9, 2023
• Last Update Submitted That Met QC Criteria: May 8, 2023
• Last Verified: May 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Heart Diseases; Cardiovascular Diseases; Vascular Diseases; Respiratory Tract Diseases; Lung Diseases; Hypertension, Pulmonary; Cardiovascular Abnormalities; Hypertension; Congenital Abnormalities; Pulmonary Arterial Hypertension; Familial Primary Pulmonary Hypertension; Heart Defects, Congenital
• Other Study ID Numbers: S57936