Yazar "Aksoyek, S." seçeneğine göre listele

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    Comparison of electromagnetic field stimulation on the healing of small and large intestinal anastomoses
    (Lippincott Williams & Wilkins, 2001) Naycı, A.; Çakmak, M.; Aksoyek, S.; Renda, N.; Yücesan, S.
    PURPOSE: Magnetic fields have been shown to affect biologic processes. Accordingly, an experimental study was designed to investigate the effect of electromagnetic field stimulation on intestinal healing and to compare small and large intestinal anastomoses. METHODS: An ileal or a colonic anastomosis was constructed in rats. Beginning the day after surgery, randomly assigned groups were exposed to sinusoidal electromagnetic field stimulation of 10.76-mT intensity and 50-Hz frequency, with 2-hour-on/10-hour-off cycles. After seven days, intestinal anastomoses were assessed for hydroxyproline content and breaking strength. Statistical comparison between each experimental and control group yielded significance (P < 0.05) in all cases. RESULTS: Hydroxyproline content increased significantly in ileum from 1.650 +/- 0.11 (mean standard error of the mean) to 2.036 +/- 0.11 g/mg (P = 0.0249) and in colon from 1.526 +/- 0.11 to 1.922 +/- 0.11 mug/mg (P = 0.0135). Breaking strength also increased significantly in ileum from 0.213 +/- 0.01 to 0.255 +/- 0.01 MPa (P = 0.001) and in colon from 0.227 +/- 0.01 to 0.270 +/- 0.01 MPa (P = 0.006). CONCLUSIONS: Electromagnetic field stimulation provided a significant gain in anastomotic healing in both small and large intestine. There were no apparent differences detected between the healing of small and large intestinal anastomoses except for slight differences in the tune sequences of events and magnitude. The study demonstrated a significant increase in both biochemical and mechanical parameters. Additional investigations are needed to determine optimal conditions and promote selective biologic responses.
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    Effect of electromagnetic fields and early postoperative 5-fluorouracil on the healing of colonic anastomoses
    (Springer-Verlag, 2003) Nayci, A.; Cakmak, M.; Renda, N.; Aksoyek, S.; Yucesan, S.
    Background and aims: Studies have indicated a deleterious effect of perioperative 5-fluorouracil (5-FU) administration on the healing of intestinal anastomoses. This study examined the effect of early postoperative 5-FU on the healing of colonic anastomoses and investigated the effect of electromagnetic fields (EMF) on colonic anastomotic repair under normal physiological conditions and in the presence of 5-FU therapy in a rat model. Materials and methods: Forty male Wistar rats were randomly assigned into four groups and underwent a standardized left colonic resection and anastomoses. The animals then served as control or received intraperitoneal 5-FU (20 mg/kg per day, 5 days), EMF stimulation (10.76 mT, 50 Hz; 2-h on/10-h off cycles, 7 days) or both, starting on the day of surgery. After 7 days anastomotic healing was assessed by measurement of hydroxyproline content and breaking strength. Results: Hydroxyproline content increased in EMF exposed group (1.53+/-0.11 to 1.92+/-0.11 mug/mg) and in EMF + 5-FU group (1.53+/-0.11 to 1.89+/-0.12 mug/mg). Breaking strength also increased in the EMF group (0.23+/-0.02 to 0.27+/-0.01 MPa) and in the EMF + 5-FU group (0.23+/-0.02 to 0.28+/-0.01 MPa. No differences were found in hydroxyproline content or breaking strength between the 5-FU group and controls. Conclusion: Early postoperative 5-FU administration did not impair the healing of colonic anastomoses in rats. Additionally, EMF stimulation provided a significant gain in colonic anastomotic strength, in rat intestines in control animals and in animals exposed to 5-FU.
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    The role of the spleen on colonic anastomotic healing
    (Taylor & Francis Inc, 2003) Nayci, A.; Çakmak, M.; Comelekoglu, U.; Renda, N.; Aksoyek, S.
    The role of the spleen on wound healing remains unclear. This study investigates the effect of splenectomy on the healing of colonic anastomoses. Twenty-six Wistar rats were assigned into four groups: sham, splenectomy, anastomoses, and splenectomy and anastomoses. The rats underwent a standardized left colonic resection and primary anastomoses, and/or splenectomy. Bursting pressure and hydroxyproline content were used to evaluate anastomotic healing, five days postoperatively. No differences were found in the bursting pressure and hydroxyproline content between the groups. The present results indicate that splenectomy has no negative effect on the healing of colonic anastomoses in rats.