title: Laparoscopic hepatectomy: a systematic review, meta-analysis, and power analysis.
abstract: OBJECTIVE
  A previous meta-analysis study demonstrated that bleeding and the duration of the hospital stay following laparoscopic hepatectomy (Lap) were significantly smaller and shorter, respectively, than for patients undergoing an open approach (Op). The aim of the present study was to re-evaluate perioperative variables and adverse outcomes in patients undergoing Lap versus (vs) Op after 2000.
  
  
  METHODS
  A PubMed and Ovid Medline search identified clinical studies that compared the outcomes of Lap vs Op patients after 2000. A meta-analysis and power analysis were performed.
  
  
  RESULTS
  Operative time was not significantly different between the two approaches (95% confidence interval [CI]: -0.063 to 0.992). Patient bleeding in the Lap group was significantly lower than in the Op group (95% CI: -1.027 to -0.390). Complications with Lap patients were significantly less frequent (95% CI: 0.231-0.642), and the duration of the hospital stay for Lap patients was significantly shorter (95% CI: -0.950 to -0.530) than for Op patients. Only one paper presented 80% power with 0.05 α-errors in all four outcomes, whereas four studies did not have sufficient statistical power.
  
  
  CONCLUSIONS
  The clinical benefits of Lap include a smaller incidence of complications and a shorter duration of hospital stay at the current time. Several studies had too few cases to sufficiently evaluate these factors, although other studies were appropriately analyzed.
authors.affiliation: Department of Surgery I, Sapporo Medical University, S-1, W-16, Chuo-ku, Sapporo, Hokkaido 060-8543, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Mizuguchi
authors.forename: Masaki
authors.initials: M
authors.lastname: Kawamoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Meguro
authors.forename: Toshihito
authors.initials: T
authors.lastname: Shibata
authors.forename: Yukio
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Yasutoshi
authors.initials: Y
authors.lastname: Kimura
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Furuhata
authors.forename: Tomoko
authors.initials: T
authors.lastname: Sonoda
authors.forename: Koichi
authors.initials: K
authors.lastname: Hirata
mesh_terms: D006498:Hepatectomy; D006801:Humans; D010535:Laparoscopy; D008107:Liver Diseases / Q000150:complications / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications; D016896:Treatment Outcome