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Clinical Trial Details — Status: Enrolling by invitation

Administrative data

NCT number NCT05583305
Other study ID # CREC 2022.352
Secondary ID
Status Enrolling by invitation
Phase
First received
Last updated
Start date October 12, 2022
Est. completion date July 17, 2026

Study information

Verified date May 2024
Source Chinese University of Hong Kong
Contact n/a
Is FDA regulated No
Health authority
Study type Observational

Clinical Trial Summary

Antiphospholipid syndrome (APS) is an important cause of young stroke which could result in major disability. Cohort studies suggested that 17% of young ischemic stroke were accountable by APS (1). Although warfarin has been the mainstay of treatment in APS for the past decades, recurrent thromboembolism occurred up to 10% of warfarinized patients with APS (2, 3). These observations call for an in-depth understanding of disease mechanisms secondary to antiphospholipid antibodies (aPL). Contrary to traditional understanding, recent evidence suggested mechanisms of cerebrovascular ischemia in APS are far more complex than hypercoagulability alone. In the proposed cross-sectional study, we aim to determine the prevalence of intracranial stenosis, and to explore the correlations between the neuroimaging findings and the immunological as well as clinical features in patients with APS. In the proposed cross-sectional study, we aim to determine the prevalence of intracranial stenosis, and to explore the correlations between the neuroimaging findings and the immunological as well as clinical features in patients with APS.


Description:

In the proposed cross-sectional study, we aim to determine the prevalence of intracranial stenosis, and to explore the correlations between the neuroimaging findings and the immunological as well as clinical features in patients with APS. Upon reviewing the clinical and laboratory information in the medical specialist out-patient clinics, electronic patient record and/or through the Clinical Data Analysis And Reporting System (CDARS), investigators shall identify and recruit on-site APS patients who fulfilled the modified Sapporo criteria, currently aged ≥18 years, and receive care from the Prince of Wales Hospital. Investigators shall then arrange a study clinic visit for eligible patients. After obtaining an informed consent, patients will be subjected to cognitive assessment (Hong Kong Version of Montreal Cognitive Assessment (HK-MoCA)), blood pressure, pulse, body mass index measurement, urinalysis, and contrast MRI brain (see imaging assessment below). Demographic data (age, gender, smoking, drinking, ambulatory status), medical comorbidities (concurrent autoimmune diseases and their organ involvement, history of catastrophic APS, hypertension, hyperlipidemia, diabetes mellitus, congestive heart failure, number and type of previous arterial or venous thromboembolism), laboratory parameters (complete blood count, liver and renal function test, C-reactive protein, erythrocyte sediment rate, high sensitive C-reaction protein, plasminogen activator inhibitor-1, neurofilament light chain, titers of autoimmune markers including anti-nuclear antibodies, extractable nuclear antigen antibodies, aPLs, rheumatoid factor, anti-cyclic citrullinated peptide antibody, etc.), concurrent medications (aspirin, warfarin, direct oral anticoagulants, antihypertensives, statins, steroid, immunosuppressants, etc.). In another ongoing prospective Brain Health Longitudinal study which contained stroke- and dementia free participants (CREC Ref. No: 2018.148), investigators shall identify age- and gender-matched individuals without aPLs as controls. They will be assessed in the same manner as the APS patients.


Recruitment information / eligibility

Status Enrolling by invitation
Enrollment 60
Est. completion date July 17, 2026
Est. primary completion date January 31, 2026
Accepts healthy volunteers No
Gender All
Age group 18 Years and older
Eligibility Inclusion Criteria: 1. Patients diagnosed with APS who fulfilled the modified Sapporo criteria: 1. at least one clinical criterion (vascular thrombosis or pregnancy morbidity); and 2. laboratory criteria (aPL positivity twice, 12 weeks apart): i. Lupus anticoagulant positivity requires screening, mixing, and confirmation test as per International Society of Thrombosis and Hemostasis guidelines (11). ii. Anticardiolipin antibodies positivity requires a medium to high titer IgG and/or IgM level by ELISA assays. iii. Anti-ß2 glycoprotein antibodies positivity requires a >99th titer IgG and/or IgM level by ELISA assays. 2. Patients age =18 years 3. Patients who are able to provide an informed consent to study procedures Exclusion Criteria: 1. Patient with established neurological disease, such as stroke, cerebral venous thrombosis, vasculitis of the central nervous system, cerebral lupus, etc. 2. Patient contraindicated to contrast MRI scans. E.g. claustrophobia, allergy to gadolinium contrast, MRI incompatible implants, estimated glomerular filtration rate of < 30mL/min/1.73m2.

Study Design


Intervention

Diagnostic Test:
Imaging assessment
Investigators shall perform cranial MRI examinations. The scanning protocol will employ an MRI scan protocol with T1-weighted, T2-weighted, FLAIR, susceptibility weighted imaging, diffusion weighted imaging, and time-of-flight magnetic resonance angiography (MRA) sequences. In addition, high-resolution magnetic resonance vessel wall imaging (HRMRI) allows assessment of the vessel wall using specific the SPACE sequence and the MATCH sequence. Assessors of the HRMRI images shall be blinded to the group allocation and clinical information.
Neurosonology assessment
Investigators shall perform carotid duplex ultrasonography (CD) assessment, focusing on the peak systolic (PSV) and end diastolic velocity (EDV) of bilateral extracranial internal carotid arteries (ICA) Brightness mode imaging shall gauge the intimal thickness and plaque characteristics (if any) of bilateral ICAs.
Blood Test
Nine milliliters of EDTA blood will be drawn during the research clinic visit for evaluation of the degree of neurovascular inflammation. Serum plasminogen activator inhibitor-1 (PAI-1) and high-sensitive C-reactive protein (hsCRP) are markers of vascular inflammation, atherosclerosis, and thrombotic risk. Serum neurofilament light chain (NfL) is a biomarker for neuroaxonal injury that correlates with small vessel disease.

Locations

Country Name City State
Hong Kong Chinese University of Hong Kong Hong Kong

Sponsors (1)

Lead Sponsor Collaborator
Chinese University of Hong Kong

Country where clinical trial is conducted

Hong Kong, 

Outcome

Type Measure Description Time frame Safety issue
Primary Radiological evidence of intracranial arterial stenosis Defined as the presence of >50% stenosis of any intracranial arteries (ICA, MCA, anterior cerebral arteries, posterior cerebral arteries, basilar artery, or vertebral arteries) or presence of arterial plaques in vessel wall imaging. 31/01/2026
Secondary Other radiological outcomes Including the presence and pattern of enhancing intracranial plaques (concentric vs eccentric), Age-related White Matter Change Scale = 2, white matter hyperintensity volume, presence of lacunes, cerebral microbleeds, extracranial ICA plaques, normalized total brain volume. Secondary biochemical outcomes include level of hs-CRP and PAI-1. The relationship between the neuroimaging outcomes and the clinical characteristics of patients with APS will be evaluated. 31/01/2026
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