title: ELEVATED INTRAOCULAR PRESSURE FOLLOWING PARS PLANA VITRECTOMY DUE TO TRAPPED GAS IN THE POSTERIOR CHAMBER.
abstract: OBJECTIVE
  Elevated intraocular pressure is relatively common following pars plana vitrectomy and intraocular gas tamponade. We discuss a series of patients who experienced elevated intraocular pressure from pupillary block and angle closure secondary to trapped gas in the posterior chamber.
  
  
  METHODS
  Case series.
  
  
  RESULTS
  Case 1 is a patient who underwent pars plana vitrectomy for retinal detachment repair. The intraocular pressure was elevated on postoperative Day 3 because of trapped gas in the posterior chamber, and it did not lower with prone positioning, maximal medical therapy, and laser peripheral iridotomies. Aspiration of the trapped gas was done with the patient sitting upright using a 27-gauge needle at the limbus, which was curative. Case 2 provides anterior-segment optical coherence tomography images that confirmed the location of the trapped gas resulting in angle closure. Case 3 demonstrates the unfortunate sequelae of a central retinal artery occlusion following delayed recognition of this entity. Case 4 highlights the challenges encountered when migratory gas is also seen elsewhere in the eye.
  
  
  CONCLUSIONS
  Clinicians should be aware of elevated intraocular pressure secondary to trapped gas in the posterior chamber, which may be recalcitrant to medical therapy. Aspiration of the trapped gas can alleviate both pupillary block and angle closure without compromising the gas tamponade.
authors.affiliation: Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa.
authors.forename: Eric K
authors.initials: EK
authors.lastname: Chin
authors.forename: David R P
authors.initials: DR
authors.lastname: Almeida
authors.forename: Austin L
authors.initials: AL
authors.lastname: Strohbehn
authors.forename: Vinit B
authors.initials: VB
authors.lastname: Mahajan
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Russell
authors.forename: James C
authors.initials: JC
authors.lastname: Folk
mesh_terms: D000368:Aged; D058450:Endotamponade / Q000009:adverse effects; D005260:Female; D005740:Gases / Q000009:adverse effects*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000209:etiology*; D057972:Posterior Eye Segment; D014821:Vitrectomy / Q000009:adverse effects*
chemical_list: D005740:Gases