title: Comparison of cumulative dissipated energy between the Infiniti and Centurion phacoemulsification systems.
abstract: OBJECTIVE
  To compare cumulative dissipated energy between two phacoemulsification machines.
  
  
  METHODS
  An ambulatory surgical center, Honolulu, Hawaii, USA.
  
  
  METHODS
  Retrospective chart review.
  
  
  METHODS
  A total of 2,077 consecutive cases of cataract extraction by phacoemulsification performed by five surgeons from November 2012 to November 2014 were included in the study; 1,021 consecutive cases were performed using the Infiniti Vision System, followed by 1,056 consecutive cases performed using the Centurion Vision System.
  
  
  RESULTS
  The Centurion phacoemulsification system required less energy to remove a cataractous lens with an adjusted average energy reduction of 38% (5.09 percent-seconds) (P<0.001) across all surgeons in comparison to the Infiniti phacoemulsification system. The reduction in cumulative dissipated energy was statistically significant for each surgeon, with a range of 29%-45% (2.25-12.54 percent-seconds) (P=0.005-<0.001). Cumulative dissipated energy for both the Infiniti and Centurion systems varied directly with patient age, increasing an average of 2.38 percent-seconds/10 years.
  
  
  CONCLUSIONS
  The Centurion phacoemulsification system required less energy to remove a cataractous lens in comparison to the Infiniti phacoemulsification system.
authors.affiliation: Department of Surgery, University of Hawaii, Honolulu, HI, USA.
authors.forename: Ming
authors.initials: M
authors.lastname: Chen
authors.affiliation: Department of Ophthalmology, John H Stroger, Jr Hospital of Cook County, Chicago, IL, USA.
authors.forename: Erik
authors.initials: E
authors.lastname: Anderson
authors.affiliation: Department of Ophthalmology, UT Southwestern Medical Center, Dallas, TX, USA.
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Hill
authors.affiliation: Biostatistics Core, John A Burns School of Medicine, University of Hawaii, Honolulu, HI, USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: Chen
authors.affiliation: Department of Ophthalmology, John H Stroger, Jr Hospital of Cook County, Chicago, IL, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Patrianakos
keywords: Centurion Vision System; Infiniti Vision System; cumulative dissipated energy; phacoemulsification