Vascular density with optical coherence tomography angiography and systemic biomarkers in low and high cardiovascular risk patients

{We aimed to compare retinal vascular density in Optical Coherence Tomography Angiography (OCT-A) between patients hospitalized for acute coronary syndrome (ACS) and control patients and to investigate correlation with angiogenesis biomarkers. Patients hospitalized for an acute coronary syndrome (ACS) in the Intensive Care Unit were included in the ``high cardiovascular risk'' group while patients without cardiovascular risk presenting in the Ophthalmology department were included as ``control''. Both groups had blood sampling and OCT-A imaging. Retina microvascularization density in the superficial capillary plexus was measured on 3x3 mm angiograms centered on the macula. Angiopoietin-2, TGF-beta 1, osteoprotegerin, GDF-15 and ST-2 were explored with ELISA or multiplex method. Overall, 62 eyes of ACS patients and 42 eyes of controls were included. ACS patients had significantly lower inner vessel length density than control patients (p=0.004). A ROC curve found that an inner vessel length density threshold below 20.05 mm(-1) was moderately associated with ACS. Significant correlation was found between serum levels of angiopoietin-2 and osteoprotegerin, and retinal microvascularization in OCT-A (R=- 0.293