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    Effects of supplemental L-arginine on the intestinal adaptive response after massive small-bowel resection in rats
    (Springer, 2002) Özturk, H; Dokucu, AI; Yagmur, Y; Sari, I
    To evaluate whether L-arginine methyl ester (L-Arg) can improve the structure of the small intestine and enhance adaptation in an experimental model of short-bowel syndrome (SBS), 40 Sprague-Dawley rats were divided randomly into four groups of 10 each. In one group only a laparotomy was performed (G1). The remaining 30 rats underwent 90% small-bowel resection (SBR) and formed the three experimental groups: the SBR/untreated group (G2), the SBR/L-NAME-treated group (W), and the SBR/ L-Arg-treated group (G4). Rats in G2 received no therapeutic treatment. Rats in the SBR/L-NAME and SBR/L-Arg treated groups received N-G-nitro-L-arginine-methyl ester (L-NAME) and L-Arg intraperitoneally for 3 weeks, respectively. The animals were weighed daily. All rats underwent a relaparotomy on day 21 of the experiment. Remnant small bowel was excised and evaluated for villus height and crypt cell mitoses. After the 90% SBR, all animals had from diarrhea and weight loss between the 1st and 6th postoperative days (POD). The body weight of the SBR/L-Arg group showed significant increases at POD 10 and 21 in comparison to the SBR/untreated and SBR/L-NAME groups (P < 0.001). The rats treated with L-Arg had significantly greater villus height and crypt-cell mitoses compared to the other groups (P < 0.0001, P < 0.001). These observations suggest that L-Arg treatment increases villus height and crypt-cell mitoses after massive SBR and may play a considerable role in the mucosal adaptive response in SBS in rats.
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    Öğe
    Effects of the nitric oxide donor molsidomine on the early stages of liver damage in rats with bile duct ligation
    (Karger, 2002) Özturk, H; Yagmur, Y; Buyukbayram, H; Dokucu, AI; Gurel, A
    This study aimed to evaluate the effects of the nitric oxide donor molsidomine on the early stages of liver damage and biochemical changes in rats with bile duct ligation (BDL). Forty prepubertal male Sprague-Dawley rats weighing 125-140 g were studied. Group 1 rats (sham-control, n = 10) were not subjected to any surgical manipulation. Group 2 rats (BDL/untreated, n = 10) were subjected to BDL but no drug was administered. Group 3 rats (BDL/L-NAME, n = 10) received a daily dose of N-G- nitro-L-arginine methyl ester (L-NAME) intraperitoneally for 7 days after BDL. Group 4 rats (BDL/molsidomine, n = 10) received a daily dose of molsidomine by gastric tube for 7 days after BDL. After 1 week, biochemical and histological evaluations were performed and the liver hydroxyproline content was measured. Serum bilirubin and liver enzymes were significantly increased in the BDL/untreated, BDL/L-NAME and BDL/molsidomine groups in comparison with the sham-control group 1 week after BDL. However, the liver enzymes were significantly decreased in the BDL/molsidomine group in comparison with the BDL/untreated and BDL/L-NAME groups. In the BDL/L-NAME group, proliferation of portal and periportal biliary ductules with disorganization of the hepatocyte plates, dilated portal spaces and areas of polymorphonuclear leukocyte infiltration, fibrosis and hepatocyte necrosis were observed. In the BDL/molsidomine group, polymorphonuclear leukocyte infiltration, hepatocyte necrosis and fibrosis were rarely seen. The hydroxyproline content in the liver was increased I week after obstruction in the BDL/untreated and BDL/L-NAME groups when compared to BDL/molsidomine group. Collagen type-IV expression was not observed in the BDL/molsidomine group in contrast to the BDL/untreated and BDL/L-NAME groups. In conclusion, during 1 week of treatment, the nitric oxide donor molsidomine improved hepatic fibrosis in the hepatic parenchyma and did not affect serum bilirubin values, but positively affected the serum aspartate aminotransferase and alanine aminotransferase values. Copyright (C) 2002 S. Karger AG, Basel.
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    Öğe
    Factors effecting morbidity in typhoid intestinal perforation in children
    (Springer-Verlag, 2002) Önen, A; Dokucu, AI; Çigdem, MK; Özturk, H; Otçu, S; Yücesan, S
    To determine the factors affecting morbidity in patients with typhoid intestinal perforation (TIP), 42 patients who had been operated upon for TIP between 1990 and 2000 were reviewed. The average age was 10.4 years, the male-to-female ratio 2.5/1. The mean interval from admission to operation was 6 h. Twenty-three children had multiple perforations. Primary closure (PC) was performed in 55% of the patients, ileostomy in 26%, and resection with anastomosis (RA) in 19%. Parenteral nutrition (PN) was available for 22 patients for an average of 9 days. Postoperative complications occurred more commonly in patients with delayed admission and/or severe peritonitis. Hospitalization was shorter and the postoperative complication rate lower in patients who received PN and in those who underwent ileostomy. None of the patients developed an enterocutaneous fistula. The 2 deaths (4.8%) resulted from overwhelming sepsis. The most significant factors affecting morbidity were prolongation of perforation-operation interval and severe peritonitis. No operative procedure is likely to be the best in all cases; therapy should be individualized. Ileostomy appears to be an effective procedure, particularly in patients with severe abdominal contamination and delayed presentation. The use of PN in addition to standard medical and surgical therapy in patients with TIP may be beneficial.