Choroidal vascularity index changes during the Valsalva manoeuvre in healthy volunteers.

Mehmet Orkun Sevik, Furkan Çam, Aslan Aykut, Volkan Dericioğlu, Özlem Şahin
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引用次数: 5

Abstract

Purpose: To evaluate the effects of the Valsalva manoeuvre (VM) on the choroidal vascularity index (CVI) in healthy volunteers.

Methods: This prospective, cross-sectional study included 60 eyes of 30 healthy volunteers. Enhanced depth imaging-optical coherence tomography scans of both eyes involving the fovea were taken, and a 1500 μm subfoveal choroidal area was selected for image binarization with open-access Fiji software. The binarized image was segmented into the stromal area (SA) and luminal area (LA), and CVI was calculated as the ratio (%) of LA to the total choroidal area (TCA). CVI, subfoveal choroidal thickness (SFCT), IOP, systolic and diastolic blood pressure were evaluated at rest and during the VM.

Results: During the VM, a mean ± standard deviation increase in LA (0.02 ± 0.05 mm2 , p < 0.001) and CVI (1.72 ± 2.83%, p < 0.001) was observed, whereas SA (-0.02 ± 0.05 mm2 , p < 0.001) decreased. There was no significant change in TCA (0.00 ± 0.03 mm2 , p = 0.55) or SFCT (1.05 ± 10.92 μm, p = 0.46). There was a moderate positive correlation between the spherical equivalent refractive error (SE) and SFCT both at rest and during VM (r58  = 0.49, p < 0.0005 and r58  = 0.49, p < 0.0005, respectively). However, there was no significant correlation between SE and CVI either at rest or during VM (p = 0.11 and 0.06, respectively). In a multiple linear regression analysis, CVI was only associated with SFCT; however, SFCT was also associated with SE, both at rest and during VM (p < 0.001).

Conclusion: Valsalva manoeuvre increases CVI by choroidal vascular dilation as demonstrated by an increase in LA and a decrease in SA. Researchers should be careful about unintentional VM during examinations.

健康志愿者Valsalva运动期间脉络膜血管指数的变化。
目的:评价Valsalva运动(VM)对健康志愿者脉络膜血管指数(CVI)的影响。方法:这项前瞻性横断面研究包括30名健康志愿者的60只眼睛。采用增强深度成像-光学相干断层扫描(Enhanced depth imaging-optical coherence tomography)对双眼进行涉及中央凹的扫描,选择1500 μm中央凹下脉络膜区域,利用开放获取的Fiji软件进行图像二值化。将二值化后的图像分割为基质面积(SA)和管腔面积(LA),计算CVI为LA与总脉络膜面积(TCA)之比(%)。静息和VM时分别评估CVI、中央凹下脉络膜厚度(SFCT)、IOP、收缩压和舒张压。结果:在VM期间,LA(0.02±0.05 mm2, p 2, p = 0.55)或SFCT(1.05±10.92 μm, p = 0.46)的平均值±标准差增加。静息和VM时的球等效屈光误差(SE)与SFCT之间存在中度正相关(r58 = 0.49, p 58 = 0.49, p)。结论:Valsalva操作通过脉络膜血管扩张增加CVI,表现为LA增加和SA降低。研究人员在检查过程中应小心无意的VM。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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