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Assessment of choroidal thickness before and after steep Trendelenburg position using swept-source optical coherence tomography

Authors
 Tyler Hyungtaek Rim  ;  Christopher Seungkyu Lee  ;  Kangyoon Kim  ;  Sung Soo Kim 
Citation
 BRITISH JOURNAL OF OPHTHALMOLOGY, Vol.99(4) : 493-499, 2015 
Journal Title
 BRITISH JOURNAL OF OPHTHALMOLOGY 
ISSN
 0007-1161 
Issue Date
2015
MeSH
Adult ; Blood Pressure/physiology ; Choroid/anatomy & histology* ; Female ; Head-Down Tilt/physiology* ; Healthy Volunteers ; Heart Rate/physiology ; Humans ; Imaging, Three-Dimensional ; Male ; Organ Size ; Prospective Studies ; Tomography, Optical Coherence*
Keywords
Anatomy ; Choroid ; Imaging
Abstract
BACKGROUND: To evaluate changes in choroidal thickness before and after steep Trendelenburg position (STP, 40° head-down) using automated segmentation software to analyse swept-source optical coherence tomography (SS-OCT) data. METHODS: The eyes of 20 healthy volunteers underwent a three-dimensional wide scanning protocol with SS-OCT (Topcon, Tokyo, Japan) at baseline, immediately after STP was initiated, and 5, 10 and 15 min after STP; blood pressure and heart rate were measured concurrently. The predictive mean difference was calculated using a generalised linear mixed model that adjusted for potential confounders. RESULTS: Mean choroidal thickness significantly and transiently increased immediately (268.18±9.24 μm, p<0.01) and 5 min (264.25±9.30 μm, p=0.03) after STP, relative to baseline (256.51±9.20 μm). However, choroidal thickness decreased by 10 min (262.51±9.34 μm, p=0.15) and 15 min (261.38±9.40 μm, p=0.37) after STP. Mean arterial pressure also transiently increased from baseline (78.2±1.2 mm Hg) immediately after STP (79.9±1.1 mm Hg, p=0.01), but normalised by 5 min after STP (p>0.05 for all comparisons ≥5 min). CONCLUSIONS: Choroidal thickness significantly but transiently increases after adopting STP, as evaluated by automated layer segmentation analysis of SS-OCT data.
Full Text
http://bjo.bmj.com/content/99/4/493.long
DOI
10.1136/bjophthalmol-2014-305525
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sung Soo(김성수) ORCID logo https://orcid.org/0000-0002-0574-7993
Lee, Christopher Seungkyu(이승규) ORCID logo https://orcid.org/0000-0001-5054-9470
Rim, Tyler Hyungtaek(임형택)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/140783
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