title: Reduction of fluence to decrease pain during panretinal photocoagulation in diabetic patients.
abstract: OBJECTIVE
  To assess the effect of laser fluence reduction to reduce pain during panretinal photocoagulation.
  
  
  METHODS
  Twenty-five patients (50 eyes) with diabetic retinopathy who had indication for panretinal photocoagulation were included in this prospective, interventional, and comparative study. The right eyes were treated using low fluence parameters (LFP), whereas the left eyes were treated with standard fluence parameters (SFP). At the end of each session, the patient was asked to rate pain from 0 (no pain) to 10 (maximum pain) for each eye (NRS-11 scale). Fluence per burn and total fluence were determined for each eye. Statistical analysis was performed using the Mann-Whitney U test and the Pearson correlation coefficient.
  
  
  RESULTS
  Pain perception (P < .01) and fluence per burn (P < .01) were significantly less using LFP compared with SFP. Pain was proportional to fluence per burn (R(2) = 0.4), but not to number of burns (R(2) = -0.2).
  
  
  CONCLUSIONS
  The use of LFP seems to be a good option to diminish the pain during panretinal photocoagulation.
authors.affiliation: Retina Department, Hospital Dr. Luis Sanchez Bulnes, Coyoacan, México.
authors.forename: Oscar
authors.initials: O
authors.lastname: Alvarez-Verduzco
authors.forename: Gerardo
authors.initials: G
authors.lastname: Garcia-Aguirre
authors.forename: Maria de Lourdes
authors.initials: Mde L
authors.lastname: Lopez-Ramos
authors.forename: Sandra
authors.initials: S
authors.lastname: Vera-Rodriguez
authors.forename: José Luis
authors.initials: JL
authors.lastname: Guerrero-Naranjo
authors.forename: Virgilio
authors.initials: V
authors.lastname: Morales-Canton
mesh_terms: D000328:Adult; D000368:Aged; D003930:Diabetic Retinopathy / Q000601:surgery*; D006801:Humans; D017075:Laser Coagulation / Q000379:methods*; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008875:Middle Aged; D010146:Pain / Q000517:prevention & control*; D010147:Pain Measurement; D011446:Prospective Studies