Laser speckle contrast analysis in rheumatoid arthritis: a pilot study

Area of Science:

• Rheumatology
• Medical Imaging
• Microvascular Physiology

Background:

• Early diagnosis and treatment are crucial for managing rheumatoid arthritis (RA).
• There is a need for non-invasive and rapid imaging techniques for RA assessment.
• Laser speckle contrast analysis (LASCA) assesses peripheral blood perfusion (PBP) at the microvascular level and is a potential candidate for RA imaging.

Purpose of the Study:

• To investigate if LASCA can detect increased PBP in active synovitis of RA patients.
• To evaluate LASCA as a potential diagnostic tool for RA-induced microvascular changes.

Main Methods:

• A pilot study involving 30 RA patients with active synovitis and 44 healthy controls (HC).
• LASCA was used to measure PBP in finger joints, expressed in perfusion units (PU).
• Statistical analysis, including a multilevel linear model, compared PBP between RA patients and matched HC.

Main Results:

• The primary analysis revealed no significant difference in mean PBP between RA joints with synovitis and HC joints (mean difference: 8.79 PU, p=0.299).
• Secondary analysis on a monoarticular level also showed no significant differences in PBP.

Conclusions:

• This pilot study found no significant difference in PBP detected by LASCA between RA patients with active synovitis and healthy controls.
• LASCA may not be a suitable method for detecting microvascular changes associated with active synovitis in rheumatoid arthritis.