title: An evaluation of intraoperative and postoperative outcomes of torsional mode versus longitudinal ultrasound mode phacoemulsification: a Meta-analysis.
abstract: OBJECTIVE
  To evaluate and compare the intraoperative parameters and postoperative outcomes of torsional mode and longitudinal mode of phacoemulsification.
  
  
  METHODS
  Pertinent studies were identified by a computerized MEDLINE search from January 2002 to September 2013. The Meta-analysis is composed of two parts. In the first part the intraoperative parameters were considered: ultrasound time (UST) and cumulative dissipated energy (CDE). The intraoperative values were also distinctly considered for two categories (moderate and hard cataract group) depending on the nuclear opacity grade. In the second part of the study the postoperative outcomes as the best corrected visual acuity (BCVA) and the endothelial cell loss (ECL) were taken in consideration.
  
  
  RESULTS
  The UST and CDE values proved statistically significant in support of torsional mode for both moderate and hard cataract group. The analysis of BCVA did not present statistically significant difference between the two surgical modalities. The ECL count was statistically significant in support of torsional mode (P<0.001).
  
  
  CONCLUSIONS
  The Meta-analysis shows the superiority of the torsional mode for intraoperative parameters (UST, CDE) and postoperative ECL outcomes.
authors.affiliation: University Eye Clinic of Trieste, Ospedale Maggiore, Trieste 34125, Italy.
authors.forename: Pia
authors.initials: P
authors.lastname: Leon
authors.affiliation: University Eye Clinic of Trieste, Ospedale Maggiore, Trieste 34125, Italy.
authors.forename: Ingrid
authors.initials: I
authors.lastname: Umari
authors.affiliation: Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste 34149, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Mangogna
authors.affiliation: University Eye Clinic of Trieste, Ospedale Maggiore, Trieste 34125, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Zanei
authors.affiliation: University Eye Clinic of Trieste, Ospedale Maggiore, Trieste 34125, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Tognetto
keywords: conventional (longitudinal) phacoemulsification; phacoemulsification; torsional phacoemulsification