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The effect of nicotine on choroidal thickness
Mehmet Ozgur Zengin1, Esat Cinar, Cem Kucukerdonmez
1Department of Ophtalmology, Izmir University Faculty of Medicine, , Izmir, Turkey.
Purpose:
To investigate the effect of nicotine on choroidal thickness using optical coherence tomography (OCT).
Design:
Prospective, case-control study.
Methods:
Sixteen young, healthy subjects and 16 age and gender matched control cases were included in this study; 4 mg nicotine gum was given to the study group and placebo gum to the control group. All participants underwent OCT scanning with a high-speed and resolution spectral-domain OCT device (3D OCT 2000, Topcon, Japan) at baseline, and 1 h following nicotine or placebo administration. The measurements were taken in the morning (10:00-12:00 hours) to avoid diurnal fluctuation.
Results:
The median foveal choroidal thickness at baseline was 337.00 μm (IQR 84.50), which decreased to 311.00 μm (IQR 78.00) at 1 h following oral nicotine intake (p=0.001). The median choroidal thickness was also significantly decreased at five other extrafoveal points (p<0.05 for all). In the control group, the median baseline choroidal thickness at the fovea was 330.50 μm (IQR 104.25), and was 332.00 μm (IQR 103.75) at 1 h (p=0.271).
Conclusions:
Nicotine causes a significant decrease in choroidal thickness following oral intake. This acute decrease might be a result of reduced ocular blood flow due to the vasoconstrictive effect of nicotine.
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