Abstract
Purpose
To evaluate the edema reduction after intravitreal injection of ranibizumab (IVR) in two diabetic macular edema (DME) components in the same eye using optical coherence tomography (OCT).
Methods
Totally 113 eyes with mixed OCT pattern of DME were included. All the eyes underwent best-corrected visual acuity (BCVA) examination and OCT scanning at baseline and follow-up visits (1, 3, and 6 months after 3 monthly consecutive IVR). The mixed OCT pattern of DME was classified into 2 OCT components: serous retinal detachment (SRD) component and non-SRD component. Foveal thickness of the SRD component (SRDFT) and the non-SRD component (NSRDFT) was compared between baseline and follow-up visits. Reduction and reduction ratio of the SRDFT and the NSRDFT at each follow-up were compared. When calculating the NSRDFT reduction ratio, we innovatively optimized a commonly used formula by subtracting the normal foveal thickness from the baseline NSRDFT.
Results
SRDFT was 265.6 ± 175.4 μm at baseline and was significantly decreased to 126.7 ± 114.4 μm at 1 month, to 110.5 ± 103.4 μm at 3 months, and to 110.4 ± 89.6 μm at 6 months (all P < 0.001). NSRDFT was 409.5 ± 173.1 μm at baseline and was significantly decreased to 274.1 ± 140.4 μm at 1 month, to 249.1 ± 95.9 μm at 3 months, and to 254.1 ± 90.4 μm at 6 months (all P < 0.001). There was no significant difference in reduction or reduction ratio between NSRDFT and SRDFT during follow-up (all P > 0.05). The correlation between BCVA and SRDFT was most significant at baseline (r = 0.366, P < 0.001) and the correlation between BCVA and NSRDFT was most significant at 6 months (r = 0.426, P < 0.001). BCVA improvement was more significantly correlated with reduction or reduction ratio of SRDFT at each follow-up timepoint (r = 0.271–0.426, all P < 0.01).
Conclusions
IVR was effective in reducing both the SRD and non-SRD components of DME according to our optimized formula. The association between BCVA improvement and edema reduction was more significant in the SRD component.
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Funding
This study was funded by the National Natural Science Foundation of China (Grant Number 81870663) and Talent Introduction Fund of Guangdong Provincial People’s Hospital (Grant Number Y012018145).
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Yijun Hu, Qiaowei Wu, and Baoyi Liu contributed equally to the article. Thanks to Xiaohong Yang and Tao Li for their design, analysis, and interpretation of the data, so they are considered as co-corresponding authors.
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All procedures performed in our study were in accordance with the ethical standards of the Research Ethics Committee of Guangdong Provincial People’s Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, informed consent is not required.
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Since the study is about the outcomes of a standard treatment of DME and no individual patient could be identified from the data, formal informed consent was waived.
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Hu, Y., Wu, Q., Liu, B. et al. Comparison of clinical outcomes of different components of diabetic macular edema on optical coherence tomography. Graefes Arch Clin Exp Ophthalmol 257, 2613–2621 (2019). https://doi.org/10.1007/s00417-019-04471-3
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DOI: https://doi.org/10.1007/s00417-019-04471-3