Association between OCT-based microangiography perfusion indices and diabetic retinopathy severity

• Published in: British journal of ophthalmology Vol. 101; no. 7; pp. 960 - 964
• Main Authors: Lin, Alexander D, Lee, Aaron Y, Zhang, Qinqin, Rezaei, Kasra A, Kinyoun, James, Wang, Ruikang K, Lee, Cecilia S
• Format: Journal Article
• Language: English
• Published: BMA House, Tavistock Square, London, WC1H 9JR BMJ Publishing Group Ltd 01.07.2017; BMJ Publishing Group LTD
• Subjects: Acquisitions & mergers; Capillaries - pathology; Clinical science; Diabetes; Diabetic retinopathy; Diabetic Retinopathy - diagnosis; Diagnostic tests/Investigation; Disease Progression; Female; Fluorescein Angiography - methods; Follow-Up Studies; Fundus Oculi; Humans; Hypertension; Imaging; Male; Medical diagnosis; Medical imaging; Middle Aged; Multivariate analysis; Retina; Retina - pathology; Retinal Vessels - pathology; Retrospective Studies; Severity of Illness Index; Tomography, Optical Coherence - methods; Visual Acuity; Retina; Imaging; Diagnostic tests/Investigation
• ISSN: 0007-1161; 1468-2079
• DOI: 10.1136/bjophthalmol-2016-309514

AimTo evaluate the association between retinal capillary non-perfusion and diabetic retinopathy (DR) severity using optical coherence tomography-based microangiography (OMAG).Methods33 patients (51 eyes) with a history of diabetes underwent imaging with a 68 kHz Cirrus-5000 spectral domain OMAG prototype. Demographic and clinical characteristics were collected. The perfusion index (PI) was defined as per cent coverage of area by retinal vessels with flow, measured within a minimum of 6.8×6.8 mm2 OMAG scan. The PI in each ETDRS zone was analysed using an automated algorithm. Univariate and multivariate analyses were used to determine the degree of association between PI and DR severity.Results51 eyes with different DR severities were imaged. More severe DR was significantly associated with lower PI after adjusting for logarithm of the minimum angle of resolution best-corrected visual acuity, hyperlipidaemia, diabetes type and ETDRS ring in a multivariate mixed linear model. Compared with the none–mild non-proliferative diabetic retinopathy (NPDR) group, the moderate–severe NPDR group had 2.7 lower PI (p=0.03) and proliferative DR group had 4.3 lower PI (p=0.003). All ETDRS zones except for the foveal centre showed inverse associations between PI and DR severity (p values<0.001 to 0.862).ConclusionsA statistically significant inverse association exists between PI and DR severity. Our study suggests that PI may become a useful biomarker in evaluating and following the progression of DR.