Intraoperative Application of Fluorescein Sodium Angiography in Vascular Retinopathy

The study used a new surgical technique: intraoperative fluorescence imaging,In the 1980s, some scholars proposed the concept of intraoperative fluorescein angiography.During vitrectomy, intraoperative fluorescein angiography under 3D microscope can guide the surgeon to observe the non-perfusion area and new blood vessels on the same screen for accurate retinal photocoagulation therapy.Through this technology, the primary retinal disease can be identified in time after the removal of vitreous hemorrhage during surgery, providing effective imaging evidence support for the design of further treatment.

With the improvement of living standards, the aging of population, the increasing incidence of chronic diseases such as hypertension and diabetes in China, the incidence of vascular retinopathy (retinal vein obstruction, diabetic retinopathy, retinal vasculitis, etc.) has also shown an increasing trend, and has become an important cause of blindness. Clinically, retinal angiofluciferin sodium angiography is mainly used to diagnose the cause of the disease. This technique has been widely used in clinic for more than 30 years, and it is safe and effective. However, its disadvantage is that patients need to have good refractive media, and the morphological changes of retinal blood vessels can be clearly observed. Vitreous hemorrhage is the most common complication of vascular retinal disease, which can be treated by vitrectomy. However, the occlusion of preoperative blood accumulation makes it impossible to effectively implement fluorescein sodium angiography, which makes doctors unable to make a comprehensive judgment of the disease in advance, which may affect the treatment plan and thus the therapeutic effect. Therefore, it is particularly important to comprehensively evaluate the primary disease of the patient's retina after removing the hematoma during the operation.

In the 1980s, some scholars proposed the concept of intraoperative fluorescein angiography, but due to poor camera resolution, insufficient digital image quality and transmission delay, the application of this technology in the surgical process is limited. In recent years, the rapid development of digitally assisted vitrectomy has enabled fundus surgeons to perform vitrectomy with a high-definition 3D screen. This technique also enables full visualization of intraoperative angiography that has not been possible before, and further real-time surgery based on this information. During vitrectomy, intraoperative fluorescein angiography under 3D microscope can guide the surgeon to observe the non-perfusion area and new blood vessels on the same screen for accurate retinal photocoagulation therapy. Through this technology, the primary retinal disease can be identified in time after the removal of vitreous hemorrhage during surgery, providing effective imaging evidence support for the design of further treatment. In this study, a specific light source and filter were designed according to Zeiss intraoperative microscope. Combined with 3D microscope, the morphology and function of retinal blood vessels can be effectively observed during the operation, which has not been reported in China. Using this technology, the team successfully observed clinical features such as non-perfusion area, neovascularization, and early formation of laser spots during vitrectomy, thus contributing to accurate treatment of the disease.

Eligibility Criteria:
Inclusion Criteria:

* There is non-absorption vitreous hemorrhage in the target eye, which requires vitrectomy;
* can follow up according to the time specified by the study;
* Age ≥ 18 years old;
* Accurate Humphrey visual field test can be performed after surgery;
* Post-operative pupil dilation and clear media for laser photocoagulation, digital photography, and OCT scanning;

Exclusion Criteria:

* Active eyelid or accessory infection;
* Medical, surgical, panomental laser, or macular laser treatment of the study eye in the past 12 months;
* Brain disease, systemic immune system disease and other related medical history;
* Preoperative blood pressure (blood pressure greater than or equal to 180/110 mmHg), blood glucose (recent (past 6 months) or ongoing poor diabetes control, ·glycated hemoglobin \&gt; 10.0 mg/dl) poor control;
* Patients with choroidal detachment and ciliary detachment before surgery;
* Any systemic drug known to be toxic to the retina or associated with the risk of macular edema;Any prior eye conditions associated with the risk of macular edema;
* History of food and drug allergy;