title: Combined preoperative irradiation and local hyperthermia delays early healing of experimental colonic anastomoses.
abstract: OBJECTIVE
  To determine if a combination of preoperative irradiation and local hyperthermia of a colonic segment is detrimental to subsequent early anastomotic healing.
  
  
  METHODS
  A prospective randomized experimental trial.
  
  
  METHODS
  An animal research laboratory.
  
  
  METHODS
  Eighty male Wistar rats were randomly divided into 4 groups. In each animal, a segment of the colon was treated successively by (sham) irradiation and (sham) hyperthermia. After 5 days, a colonic resection was performed and an anastomosis was constructed; the distal limb consisted of (sham) irradiated, (sham) hyperthermia-treated bowel. The rats were killed 3 or 7 days after surgery.
  
  
  METHODS
  Body weight, serum albumin and protein levels, anastomotic bursting pressure, breaking strength, and hydroxyproline content.
  
  
  RESULTS
  All animals tolerated (sham) treatment well. Weight was diminished, though not notably, in treated animals vs the control group. After combined preoperative irradiation and hyperthermia, the frequency of local anastomotic complications increased: 4 of 20 animals had a covered perforation when they were killed. In this group, the bursting pressure was lower 3 days after the operation (P = .008). The breaking strength was also lower but not notably. The serum albumin level was significantly lower in this group vs the control group (P = .006); the serum protein level was not decreased. After 7 days, no differences existed between the groups. The hydroxyproline content of the anastomotic tissue was notably higher in rats treated with radiation plus hyperthermia vs control rats (in both the 3- and 7-day groups). The anastomotic hydroxyproline concentration did not differ between the groups.
  
  
  CONCLUSIONS
  The combination of preoperative irradiation and hyperthermia results in increased local anastomotic complications. Anastomotic strength is at risk in the first days after the anastomotic reconstruction. Preoperative irradiation or hyperthermia alone does not lead to impaired anastomotic healing in the early phase.
authors.affiliation: Department of Surgery, University Hospital Nijmegen, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Biert
authors.forename: W
authors.initials: W
authors.lastname: Seifert
authors.forename: B
authors.initials: B
authors.lastname: de Man
authors.forename: T
authors.initials: T
authors.lastname: Wobbes
authors.forename: J
authors.initials: J
authors.lastname: Hoogenhout
authors.forename: T
authors.initials: T
authors.lastname: Hendriks
mesh_terms: D000714:Anastomosis, Surgical; D000818:Animals; D001798:Blood Proteins / Q000032:analysis; D001835:Body Weight; D003106:Colon / Q000378:metabolism / Q000528:radiation effects / Q000601:surgery*; D006909:Hydroxyproline / Q000378:metabolism; D006979:Hyperthermia, Induced; D008297:Male; D011300:Preoperative Care; D011829:Radiation Dosage; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012709:Serum Albumin / Q000032:analysis; D013718:Tensile Strength; D014945:Wound Healing / Q000528:radiation effects
chemical_list: D001798:Blood Proteins; D012709:Serum Albumin; D006909:Hydroxyproline