title: Hyaluronan levels during laparoscopic versus open colonic resections.
abstract: BACKGROUND
  Plasma hyaluronan binds to fibrinogen, affecting intravascular fibrin polymerization and fibrin clot formation. It has been hypothesized that alterations in fibrin clot formation influence the risk of thromboembolism in those undergoing surgery. The aim of this study is to quantify the intravascular components, especially plasma hyaluronan levels, in laparoscopic and conventional colorectal resections that contribute to thromboembolism formation.
  
  
  METHODS
  Prospective cohort analysis of consecutive patients which were participating in the prospective randomized multi-center trial Lapkon II comparing the long-term effects of laparoscopic and conventional resection for colon cancer. Plasma samples were obtained from 15 patients at the beginning and the end of laparoscopic or conventional colorectal resections. Concentrations and activities of tissue plasminogen activator(t-PA), plasminogen activator inhibitor type 1(PAI-1), t-PA/PAI complex, fibrinogen, d-dimers and hyaluronan were determined by using commercial enzyme-linked immunosorbent assay (ELISA) kits.
  
  
  RESULTS
  No differences in age, sex and type of resection between the laparoscopic and conventional-surgery groups were observed. Laparoscopic procedures lasted longer (p < 0.05). Concentration and activities of t-PA, PAI-1, t-PA/PAI complex, fibrinogen and d-dimers did not vary between the two groups. Plasma hyaluronan decreased from 28.6 to 17.9 IU/ml (p < 0.05) during laparoscopic compared to conventional procedures. Plasma hyaluronan levels were significantly different at the end of operation between the two groups (p < 0.05) .
  
  
  CONCLUSIONS
  Plasma hyaluronan levels were decreased in patients undergoing laparoscopic colorectal resections, compared to those undergoing conventional procedures. Therefore, interactions between plasma hyaluronan and fibrinogen may be lower, with a sequential decrease in fibrin polymerization, and a possibly reduced risk of deep venous thrombosis.
authors.affiliation: Department of General, Visceral, Vascular and Thoracic Surgery, University Medicine Berlin, Charité Campus Mitte, Berlin, Germany. jens.neudecker@charite.de
authors.forename: J
authors.initials: J
authors.lastname: Neudecker
authors.forename: B A
authors.initials: BA
authors.lastname: Neudecker
authors.forename: W
authors.initials: W
authors.lastname: Raue
authors.forename: R
authors.initials: R
authors.lastname: Stern
authors.forename: W
authors.initials: W
authors.lastname: Schwenk
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D003082:Colectomy / Q000379:methods*; D003113:Colonoscopy / Q000009:adverse effects / Q000379:methods*; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D006820:Hyaluronic Acid / Q000097:blood*; D007813:Laparotomy / Q000009:adverse effects / Q000379:methods; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D009367:Neoplasm Staging; D011183:Postoperative Complications / Q000517:prevention & control; D011300:Preoperative Care; D011336:Probability; D011379:Prognosis; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D013923:Thromboembolism / Q000097:blood / Q000517:prevention & control*; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers; D006820:Hyaluronic Acid