title: Supplemental perioperative fluid administration increases tissue oxygen pressure.
abstract: BACKGROUND
  Wound infections are common and serious surgical complications. Wound perfusion delivers oxygen, inflammatory cells, growth factors, and cytokines to injured tissues. Hypoperfused regions experience low oxygen tensions that do not support adequate oxidative killing or wound healing. Clinicians may fail to recognize clinically important hypovolemia because hemodynamic stability and urine output are maintained after peripheral perfusion is compromised. We tested the hypothesis that supplemental fluid administration during and after elective colon resection increases tissue perfusion and tissue oxygen pressure.
  
  
  METHODS
  Fifty-six patients undergoing colon resection were randomly assigned to conservative (8 mL x kg(-1) x h(-1), n = 26) or aggressive (16 to 18 mL x kg(-1) x h(-1), n = 30) fluid management. Anesthetic technique was standardized. We used 60% nitrous oxide in 40% oxygen. During surgery and postanesthetic recovery, subcutaneous oxygen tension (P(sq)O(2)) was measured by using a polarographic sensor implanted subcutaneously into 1 upper arm. Capillary blood flow was evaluated postoperatively with a thermal diffusion system. Data were analyzed with 2-tailed t tests; P value less than.05 was considered statistically significant.
  
  
  RESULTS
  Hemodynamic and renal responses were similar in the groups. Intraoperative tissue oxygen tension was significantly greater in patients given supplemental fluid: 81 +/- 26 vs 67 +/- 18 mm Hg, P =.03. Postoperative P(sq)O(2) (77 +/- 26 vs 59 +/- 15 mm Hg, P =.009) and capillary blood flow (69 +/- 12 vs 53 +/- 12, P <.001) were also greater in the supplemental fluid patients.
  
  
  CONCLUSIONS
  Supplemental perioperative fluid administration significantly increases tissue perfusion and tissue oxygen partial pressure. Optimizing tissue perfusion will require providing more fluid than indicated by normal clinical criteria or use of invasive monitoring to guide treatment. The actual effect of supplemental fluid administration on incidence of wound infection requires further investigation.
authors.affiliation: Department of Anesthesiology, Section of Colon and Rectal Surgery, Washington University, St Louis, Mo, USA.
authors.forename: Cem F
authors.initials: CF
authors.lastname: Arkiliç
authors.forename: Akiko
authors.initials: A
authors.lastname: Taguchi
authors.forename: Neeru
authors.initials: N
authors.lastname: Sharma
authors.forename: Jebadurai
authors.initials: J
authors.lastname: Ratnaraj
authors.forename: Daniel I
authors.initials: DI
authors.lastname: Sessler
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Read
authors.forename: James W
authors.initials: JW
authors.lastname: Fleshman
authors.forename: Andrea
authors.initials: A
authors.lastname: Kurz
mesh_terms: D000328:Adult; D003108:Colonic Diseases / Q000601:surgery*; D005260:Female; D005440:Fluid Therapy / Q000379:methods*; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000378:metabolism*; D019990:Perioperative Care / Q000379:methods*; D013530:Surgical Wound Infection / Q000517:prevention & control
chemical_list: D010100:Oxygen