Anterior Displacement of Lamina Cribrosa during Valsalva Maneuver in Young Healthy EyesReport as inadecuate




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Purpose

To investigate lamina cribrosa LC displacement during the Valsalva maneuver in young healthy eyes using enhanced depth imaging EDI spectral-domain optical coherence tomography SD-OCT.

Methods

Forty-eight eyes of 48 young healthy volunteers age range: 20–34 years underwent intraocular pressure IOP measurement by Goldmann applanation tonometry as well as Cirrus HD-OCT scans before and during the Valsalva maneuver. The optic nerve head ONH parameters average retinal nerve fiber layer thickness, rim area, disc area, average C-D ratio, vertical C-D ratio, cup volume, anterior LC depth LCD, subfoveal and peripapillary choroidal thickness, and neural canal opening diameter were measured on compensated OCT and compared during Valsalva challenge. The subjects were asked to take a five-minute break after each Valsalva maneuver.

Results

During the Valsalva maneuver, the IOP significantly increased, from 12.7 ± 3.0 mmHg to 16.0 ± 3.2 mmHg P < 0.001, while the LCD sharply decreased, from 463.4 ± 118.8 μm to 427.3 ± 106.4 μm P < 0.001. The subfoveal choroidal thickness 300.7 ± 90.6 vs. 309.6 ± 93.5 μm, peripapilllary choroidal thickness 152.2 ± 55.4 vs. 150.8 ± 49.3 μm, neural canal opening diameter 1651.8 ± 204.2 vs. 1651.0 ± 217.6 μm, and all of the ONH parameters did not change significantly all P > 0.05.

Conclusions

The Valsalva maneuver induced anterior displacement of the LC, but did not alter the choroidal thickness or ONH morphology. The data describe the positional characteristics of the LC in response to the Valsalva maneuver in young healthy eyes.



Author: Yong Woo Kim, Michael J. A. Girard, Jean Martial Mari, Jin Wook Jeoung

Source: http://plos.srce.hr/



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