Angioid Streaks, Grönblad-Stranberg Disease (Pseudoxanthoma Elasticum), Peau d'Orange, Pseudoxanthoma Elasticum
Conditions
Keywords
ABCC6, Pseudoxanthoma elasticum, PXE, Angioid streaks, Peau d'orange, Grönblad-Strandberg Syndrome
Brief summary
This monocentric clinical observational study at the University Eye Hospital Bonn investigates the natural history and structural consequences of a diseased Bruch's membrane (BrM) in Pseudoxanthoma elasticum (PXE). The study includes four main objectives: 1. Direct Bruch's Membrane Alterations: Longitudinal analysis of BrM reflectivity using high-resolution OCT to assess correlations with disease progression 2. Choriocapillaris Flow Deficits: Evaluation of choriocapillaris (CC) perfusion in relation to BrM calcification, aiming to clarify whether CC deficits precede or result from BrM changes 3. Retinal Atrophy Progression: Monitoring the development and expansion of retinal atrophic areas over two years, including correlations with specific features like reticular pseudodrusen and hyperreflective spots 4. Genotype-Phenotype Correlation: Analysis of different ABCC6 gene mutations to identify correlations with imaging features and disease severity, potentially guiding future personalized therapeutic strategies The study will recruit 100 PXE patients and 100 controls, with data collection over 10 years. It involves non-invasive imaging and blood sampling. No direct benefit is expected for participants, but the findings may inform future clinical trials and improve patient counseling.
Interventions
None listed
Sponsors
University Hospital, Bonn
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Healthy volunteers
Yes
Inclusion criteria
for PXE cohort: * PXE based on the criteria of Plomp et al. * Clear ocular media * Ability to perform the tasks of the study protocol (i.e., holding the head still for image aquisition)
Exclusion criteria
* Any confounding ocular disease not associated with PXE * Systemic diseases hindering the study examinations
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Eccentricity of 'Peau d'orange' over 2 years | 2 years | 'Peau d'orange' will be measured in en-face imaging \[mm2\] |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Bruch's Membrane changes on High-Resolution Optical coherence tomography (OCT) | 2 years | Bruch's membrane will be qualitatively graded on High resolution OCT (integrity, breaks, ...) |
| Choriocapillaris flow voids on Optical Coherence Tomography Angiography (OCT-A) | 2 years | Choriocapillaris degeneration will be evaluated on OCT-Angiography, i.e. percent (%) of flow voids, progression over 2 years |
| Angioid Streak Length on Fundus Photography and Infrared Reflectance Imaging | 2 years | Angioid Streaks will be measured manually with the unit \[mm\] |
Countries
Germany
Contacts
Primary ContactKristina Pfau, MD, FEBO
Outcome results
None listed