title: Adverse events after radiofrequency ablation of unresectable liver tumors: a single-center experience.
abstract: BACKGROUND
  Radiofrequency ablation (RFA) is a relatively new modality to treat liver tumors that is being incorporated into practice despite the fact that its risk profile has not been well described.
  
  
  METHODS
  A retrospective cohort study, using structured chart review, on patients with liver tumor(s) was conducted from August 1998 to November 2006. Univariate and multivariate exploratory analyses were used to evaluate factors associated with adverse events.
  
  
  RESULTS
  RFA procedures were performed on 196 patients (58% primary tumors, 24% colorectal metastases, and 18% other metastases). Twenty-three patients (12%) experienced serious adverse events. Multivariate analysis showed advanced age (>or=55 y), underlying liver disease, large tumor size (>4 cm), and concomitant procedure were associated with an increased risk of adverse events (P = .01, P < .01, P = .01, and P = .01, respectively). There were no in-hospital deaths.
  
  
  CONCLUSIONS
  RFA was associated with acceptable morbidity and mortality. Factors associated with adverse events should be considered when counseling patients regarding RFA procedures.
authors.affiliation: Department of Surgery, University of Washington, Seattle, WA 98195, USA. olao@u.washington.edu
authors.forename: Oliver B
authors.initials: OB
authors.lastname: Lao
authors.forename: Farhood
authors.initials: F
authors.lastname: Farjah
authors.forename: David R
authors.initials: DR
authors.lastname: Flum
authors.forename: Raymond S
authors.initials: RS
authors.lastname: Yeung
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017115:Catheter Ablation / Q000009:adverse effects* / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D010535:Laparoscopy; D007813:Laparotomy; D008113:Liver Neoplasms / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011183:Postoperative Complications / Q000453:epidemiology*; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate / Q000639:trends; D014861:Washington / Q000453:epidemiology; D055815:Young Adult