Abstract
Background
Optical coherence tomography angiography (OCTA) is a novel and noninvasive technique for the quantitative assessment of retinal microvascular perfusion. Since the retinal and cerebral small vessels share similar embryological origins, anatomical features, and physiological properties, altered retinal microvasculature might provide a new perspective on the mechanisms of cerebral small vessel disease (CSVD).
Objective
We aimed to evaluate retinal vessel density (VD) in patients with CSVD using OCTA and identify associations with cerebral magnetic resonance imaging (MRI) markers and cognitive function.
Methods
We prospectively recruited 47 CSVD patients and 30 healthy controls (HCs) to participate in the study. All participants underwent OCTA to evaluate retinal microvascular perfusion. The VDs of the macular region in the superficial retinal capillary plexus (SRCP), deep retinal capillary plexus (DRCP), and foveal avascular zone (FAZ) were determined, along with the VD of the optic nerve head (ONH) in the radial peripapillary capillary (RPC) network. Additionally, cerebral MRI and cognitive function tests were performed.
Results
In the macula area, the VD of the CSVD patients was significantly lower than HCs in the temporal quadrant of SRCP. In the ONH area, CSVD patients had lower VD than HCs in the peripapillary RPC network. According to multiple linear regression analysis, decreased VD of the macular SRCP was associated with white matter hyperintensity scores after adjustment for age, hypertension, diabetes, and hyperlipidemia. Furthermore, the VD of the macular SRCP was significantly correlated with CSVD patients’ cognitive function, especially global cognition, memory function, attention function, information processing, and executive function.
Conclusion
OCTA revealed a significant decrease in retinal microvascular perfusion in CSVD patients, and retinal hypoperfusion was related to MRI markers and cognitive function, suggesting that these parameters could have potential utility as early disease biomarkers.
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Funding
This study was supported by the National Key R&D Program of China (nos. 2016YFC1300604, 2016YFC1305904, and 2018YFC1314200).
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All procedures performed in the studies involving human participants were in accordance with the Scientific Research Projects Approval Determination of Ethics Committee of The First Affiliated Hospital of Anhui Medical University, with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. All the experiments were conducted with the consent of the patient and his/her family, and written informed consent was obtained in accordance with the Declaration of Helsinki.
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Wang, X., Wei, Q., Wu, X. et al. The vessel density of the superficial retinal capillary plexus as a new biomarker in cerebral small vessel disease: an optical coherence tomography angiography study. Neurol Sci 42, 3615–3624 (2021). https://doi.org/10.1007/s10072-021-05038-z
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DOI: https://doi.org/10.1007/s10072-021-05038-z