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Scientific article
English

Positive Vitreous Pressure: Pathophysiology, Complications, Prevention and Management

Published inSurvey of ophthalmology, vol. 62, no. 2, p. 127-133
Publication date2017
Abstract

Positive vitreous pressure (PVP) occurs during anterior segment intraocular surgery associated with acute hypotony and is characterized by forward displacement of the lens-iris diaphragm with shallowing of the anterior chamber resistant to reformation, repeated iris prolapse, and, in severe cases, zonular rupture and vitreous or lens prolapse that can lead to a cascade of intraoperative complications. PVP is particularly common during penetrating keratoplasty (PK), conventional nuclear expression cataract extraction, and repair of anterior open globe injury. Hypotony resulting from aqueous loss leads to elevated vitreous pressure from three possible causes: external scleral compression, acute intraocular intumescence, or rarely acutely increased vitreous volume. Understanding the pathophysiology of PVP helps in its prevention and management.

Citation (ISO format)
CHRONOPOULOS, Argyrios, THUMANN, Gabriele, SCHUTZ, James Scott. Positive Vitreous Pressure: Pathophysiology, Complications, Prevention and Management. In: Survey of ophthalmology, 2017, vol. 62, n° 2, p. 127–133. doi: 10.1016/j.survophthal.2016.10.002
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ISSN of the journal0039-6257
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