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Simultaneous measurement of intraocular pressure in the anterior chamber and the vitreous cavity.
MedLine Citation:
PMID:  19878112     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
PURPOSE: To simultaneously measure, using manometry, the changes of intraocular pressure (IOP) in the anterior chamber and in the vitreous cavity of a single porcine eye, induced by an external column of water.
METHODS: We prospectively measured IOP simultaneously in seven freshly enucleated porcine eyes in both the anterior chamber and the vitreous cavity. Measurements were obtained through blood-pressure transducers connected to 21-gauge catheters. A third cannula was inserted into the anterior chamber to increase the IOP; when the cannula was connected to the water column, the pressure increased rapidly from 0 to 180 mmHg. Changes were registered every 5 seconds during the first minute. Statistical analysis was performed using the Wilcoxon signed-rank test. P ≤ 0.05 was considered significant.
RESULTS: Before the IOP was increased, the median basal IOP value was 18 mmHg in the anterior chamber and 23 mmHg in the vitreous cavity (P > 0.05). Sixty seconds after the end of the experiment, the median IOP value was 135 mmHg (range 122-145) in the anterior chamber and 55 mmHg (range 16-68) in the vitreous cavity (P < 0.01).
CONCLUSION: Cannulation of the anterior chamber measures the actual IOP; however, the IOP measured by cannulation in the vitreous cavity using the same catheter diameter was different, possibly because of the viscosity of the vitreous. The viscosity of the vitreous probably makes the cannulation method of IOP evaluation in the vitreous cavity inaccurate.
Authors:
José Luis Hernández-Verdejo; Miguel A Teus; Gema Bolivar
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta ophthalmologica     Volume:  88     ISSN:  1755-3768     ISO Abbreviation:  Acta Ophthalmol     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101468102     Medline TA:  Acta Ophthalmol     Country:  England    
Other Details:
Languages:  eng     Pagination:  e265-8     Citation Subset:  IM    
Copyright Information:
© 2009 The Authors. Journal compilation © 2009 Acta Ophthalmol.
Affiliation:
Vissum Corporation, Madrid, Spain. jlhernandez@cnoo.es
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