Purchase this article with an account.
H. Tanaka, K. Nitoh, A. Atsuhiro, Y. Shimada, M. Kuze, A. Nakamura, M. Horiguchi; Measurement of Volume of Vitreous Space During Vitrectomy. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3169.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
To measure the volume of the vitreous space during vitrectomy, which is defined as the space in the vitreous cavity filled with fluid after vitrectomy and replaced with air after fluid-air exchange.
The volume of the vitreous space was measured after fluid-air exchange during vitrectomy in 82 eyes (retinal detachment: 43 eyes; idiopathic macular hole, 31 eyes; others, 8 eyes). The volume of the vitreous space was determined by measuring the volume of the aspirated fluid during the fluid-air exchange and subtracting the volume of the fluid in the tube between the infusion needle and three-way stopcock from the measured volume of the aspirated fluid. After the measurement, 20% of the air was aspirated from the vitreous space and the same amount of 100% SF6 was injected into 75 eyes.
The mean ± standard deviation of the volume of the vitreous space was 5.38 ± 1.22 ml with a range from 3.5 ml to 9.2 ml. The volume was significantly correlated with the axial length (Y=0.49X-6.92, R2=0.71, P <0.001) in 82 patients. We also found s significant correlation between them in cases with macular hole (Y=0.38X-4.51, R2=0.71, P<0.0001) and cases with retinal detachment (Y=0.59X-8.88, R2=0.79, P<0.001). The regression coefficient was significantly bigger in the eyes with a retinal detachment (Pearson's correlation coefficient analysis; t=0.3, P<0.004). Postoperatively, the intraocular pressure did not increase, and the volume of the injected gas was not too small to tamponade the retina.
We found a large variation in the volume of the vitreous space, which indicated that the two-way technique for gas injection is good. Our data also suggest that, if surgeons can measure the volume, injection of 20% of the volume with 100% SF6 is reasonable. The volume of the vitreous space was different between macular hole and retinal detachment, which might be caused by that the difference of the shape of the eye ball or difference of the volume of the vitreous left in the vitreous base.
This PDF is available to Subscribers Only