title: Effects of pegaptanib injections on intraocular pressure with and without anterior chamber paracentesis: a prospective study.
abstract: OBJECTIVE
  To investigate how prophylactic anterior chamber paracentesis affects the intraocular pressure (IOP) after intravitreal pegaptanib injections.
  
  
  METHODS
  In this prospective study, 41 eyes of 41 patients receiving intravitreal pegaptanib injections were randomly assigned either to receive anterior chamber paracentesis prior to the injection (Group A, 20 patients, n = 35 injections) or not (Group B, 21 patients, n = 38 injections). IOP was measured before the pegaptanib injection (T0) and 2 min (T1), 30 min (T2) and 1 week (T3) after the injection. A four-point scale was used to evaluate the subjective pain experienced during the procedure.
  
  
  RESULTS
  The mean IOP at T1 was 15.3 ± 7.5 mmHg in group A and 47.1 ± 24.1 mmHg in group B (difference -31.85 mmHg, 95% Confidence interval -40.13 to -23.56; p < 0.0001). In 45% of the injections without paracentesis, IOP was higher than 50 mmHg 2 min after the pegaptanib injection. No significant difference in IOP was observed at T0, T2 and T3 between the two study groups. The mean pain scores did not differ significantly (0.97 in group A versus 1.32 in group B; p = 0.08).
  
  
  CONCLUSIONS
  The results suggest that prophylactic anterior chamber paracentesis helps to prevent the high postoperative IOP spike without causing patients any additional pain.
authors.affiliation: Department of Ophthalmology, Päijät-Häme Central Hospital, Finland. maria.knip@helsinki.fi
authors.forename: Maria M
authors.initials: MM
authors.lastname: Knip
authors.forename: Juha
authors.initials: J
authors.lastname: Välimäki
mesh_terms: D000368:Aged; D020533:Angiogenesis Inhibitors / Q000008:administration & dosage*; D000867:Anterior Chamber; D052157:Aptamers, Nucleotide / Q000008:administration & dosage*; D058447:Eye Pain / Q000175:diagnosis; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D058449:Intravitreal Injections; D008297:Male; D010147:Pain Measurement; D019152:Paracentesis; D011183:Postoperative Complications / Q000517:prevention & control; D011446:Prospective Studies; D014065:Tonometry, Ocular; D042461:Vascular Endothelial Growth Factor A / Q000037:antagonists & inhibitors
chemical_list: D020533:Angiogenesis Inhibitors; D052157:Aptamers, Nucleotide; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; C495058:pegaptanib