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Variation of retinal and choroidal microvascularization after an exercise stress test in patients with effort angina
Safa Ben Aoun1,2, Hela Sassi1,2, Khadija Mzoughi2,3
1Department of ophthalmology, Habib Thameur University Hospital, Tunis, Tunisia.
Purpose:
To describe retinal and choroidal vascular changes following an exercise stress test (ET) in patients with effort angina and to determine whether optical coherence tomography angiography (OCT-A) could play a role in the prediction of ischemic cardiac events.
Methods:
Prospective comparative study including patients with effort angina. All patients underwent OCT-A before and after an ET was performed. Blood flow, intercapillary spaces, and vessel density were analyzed in the superficial capillary plexus (SCP) and the deep capillary plexus (DCP). Vessel density in the choriocapillaris and the parameters of the central avascular zone (CAZ) were also analyzed.
Results:
Of the 38 eyes included in the study, a decrease in blood flow was found in 39.5% in the large SCP vessels, in 50% in the capillaris of the SCP, and in 81.6% in the DCP. An increase in intercapillary spaces was observed in the SCP in 68.4% of eyes and in the DCP in 55.3% of eyes. A statistically significant decrease in the DCP density was observed after an ET (p = 0.03). There were no significant modifications in the CAZ parameters, the SCP density, nor the choriocapillaris density. Patients with a positive ET had a decreased DCP density in 83.3%. Among patients with an increased DCP density, 92.85% had a negatif ET.
Conclusion:
This pilot study suggests that DCP density significantly decreases after an ET. The DCP appears to be most affected in patients with effort angina. A larger trial is needed to further investigate these hypotheses.
