title: Sub-Tenon's anesthetic administration for cataract surgery: how much stays in?
abstract: We performed a prospective, randomized trial assessing the "remaining" volume of anesthetic solution that stays within the sub-Tenon's space after administration of 2 different volumes: 3 mL and 5 mL. The remaining volume correlated with motor block (r = 0.72; P < 0.001). The volume lost through the incision as a percentage of total volume injected was similar in both groups, suggesting sub-Tenon's space is not limited to a finite injected volume less than 5 mL and may be capable of receiving larger volumes of anesthetic to improve motor block.
  
  
  CONCLUSIONS
  The volume of anesthetic solution remaining within sub-Tenon's space correlates with motor block. The amount of volume lost as a percentage of total administered is independent of the volume injected, suggesting sub-Tenon's space is not limited to a finite injected volume less than 5 mL and may be capable of receiving larger volumes of anesthetic to improve motor block.
authors.affiliation: Department of Ophthalmology, Princess Margaret Hospital, Dunfermline, Fife, United Kingdom.
authors.forename: Niall
authors.initials: N
authors.lastname: Patton
authors.forename: Tahira Y
authors.initials: TY
authors.lastname: Malik
authors.forename: Tariq M
authors.initials: TM
authors.lastname: Aslam
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000772:Anesthesia, Local / Q000379:methods*; D002387:Cataract Extraction / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies