title: Vitamin C reduces ischemia-reperfusion injury in a rat epigastric island skin flap model.
abstract: Free radicals have been implicated in the cause of ischemia-reperfusion injury. Various agents have been used in an attempt to reduce ischemia-reperfusion injury pharmacologically, including free radical scavengers. Vitamin C (ascorbic acid), a well-known free radical scavenger, has not, to the best of our knowledge, been evaluated in this respect. Previous work at our institution has shown that vitamin C decreases capillary permeability, thus significantly reducing fluid resuscitation requirements in postburn cases. Because this is due in part to the scavenging effect of vitamin C on free radicals, we investigated the role, if any, of vitamin C on ischemia-reperfusion injury in a rat epigastric island skin flap model. Twenty-four adult Sprague-Dawley rats were divided into control and vitamin C groups. Superficial epigastric island skin flaps measuring 6.0 x 3.5 cm were raised. Pedicles were isolated and occluded with microvascular clamps for 6 hours. The flaps were then sutured back to their beds over Steri-Drape barriers. Fifteen minutes before reperfusion, the control group flaps were perfused via femoral artery cannulation with normal saline (2.5 ml/kg). The vitamin C-treated group was perfused in a similar fashion with 2.5 ml/kg of a vitamin C/normal saline solution (27 mg/ml). The animals were observed for 7 days, and the percentage of flap survival was determined using a paper template technique. The vitamin C-treated group demonstrated a significantly higher percentage of flap survival than did the control group (25.8% mean vs. 7.5% mean, p < 0.025). In this animal model, vitamin C reduced or limited reperfusion injury after 6 hours of ischemia.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Division of Plastic Surgery, Monmouth Medical Center, Long Branch, NJ.
authors.forename: A
authors.initials: A
authors.lastname: Zaccaria
authors.forename: N
authors.initials: N
authors.lastname: Weinzweig
authors.forename: M
authors.initials: M
authors.lastname: Yoshitake
authors.forename: T
authors.initials: T
authors.lastname: Matsuda
authors.forename: M
authors.initials: M
authors.lastname: Cohen
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000627:therapeutic use*; D006085:Graft Survival; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000517:prevention & control*; D013524:Surgical Flaps
chemical_list: D001205:Ascorbic Acid