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서석인,이종률,박성호,하현권,김진천 대한대장항문학회 2015 Annals of Coloproctolgy Vol.31 No.4
Purpose: This study evaluated the efficacy of a water-soluble contrast enema (WCE) in predicting anastomotic healing after a low anterior resection (LAR). Methods: Between January 2000 and March 2012, 682 consecutive patients underwent a LAR or an ultra-low anterior resection (uLAR) and were followed up for leakage. Clinical leakage was established by using physical and laboratory findings. Radiologic leakage was identified by using retrograde WCE imaging. Abnormal radiologic features on WCE were categorized into four types based on morphology: namely, dendritic, horny, saccular, and serpentine. Results: Of the 126 patients who received a concurrent diverting stoma, only two (1.6%) suffered clinical leakage due to pelvic abscess. However, 37 patients (6.7%) in the other group suffered clinical leakage following fecal diversion (P = 0.027). Among the 163 patients who received a fecal diversion, 20 showed radiologic leakage on the first WCE (eight with and 12 without a concurrent diversion); 16 had abnormal features continuously until the final WCE while four patients healed spontaneously. Eleven of the 16 patients (69%), by their surgeon’s decision, underwent a stoma restoration based on clinical findings (2/3 dendritic, 3/4 horny, 5/7 saccular, 1/2 serpentine). After stoma reversal, only 2 of the 11 (19%) complained of complications related to the rectal anastomosis. Conclusion: WCE is helpful for detecting radiologic leakage before stoma restoration, especially in patients suffering clinical leakage after an uLAR. However, surgeons appear to opt for stoma restoration despite the persistent existence of radiologic leakage in cases with particular features on the WCE.
The Role of Diverting Stoma After an Ultra-low Anterior Resection for Rectal Cancer
서석인,유창식,김권식,이종률,윤용식,김찬욱,임석병,김진천 대한대장항문학회 2013 Annals of Coloproctolgy Vol.29 No.2
Purpose: A diverting stoma is known to reduce the consequences of distal anastomotic failure following colorectal surgery. The aim of this study was to evaluate the efficacy of a diverting stoma after an ultra-low anterior resection (uLAR)for rectal cancer. Methods: Between 2000 and 2007, 836 patients who underwent an uLAR were divided into two groups, depending on the fecal diversion: 246 received fecal diversion, and 590 had no diversion. Patient- and disease-related variables were compared between the two groups. Results: Thirty-two of the 836 patients (3.8%) had immediate anastomosis-related complications and required reoperation. Anastomosis leakage comprised 72% of the complications (23/32). The overall immediate complication rate was significantly lower in patients with a diverting stoma (0.8%, 2/246) compared to those without a diverting stoma (5.1%,30/590; P = 0.005). The fecal diversion group had lower tumor location, lower anastomosis level, and more preoperative chemo-radiation therapy (P < 0.001). In total, 12% of patients in the diverting stoma group had complications either in making or reversing the stoma (30/246). Conclusion: The diverting stoma decreased the rate of immediate anastomosis-related complications. However, the rate of complications associated with the diverting stoma was non-negligible, so strict criteria should be applied when deciding whether to use a diverting stoma.
질산성 질소가 감성돔(Acanthopagrus schlegelii) 치어에 미치는 급성 독성 영향
서석,최은지,박정환 한국수산과학회 2019 한국수산과학회지 Vol.52 No.3
This study evaluated acute nitrate nitrogen (NO3-N) toxicity in juvenile blackhead seabream Acanthopagrus schlegelii. Seventy juveniles (Trial A, 7.1±0.6 g) and nine juveniles (Trial B, 71.3±3.5 g) per 70 L tank were exposed to NO3-N concentrations of 0, 500, 1500, 2500, 3500, and 4500 mg/L and 0, 600, 1200, 1800, 2400, and 3000 mg/L, respectively, in triplicate for 7 days. In Trial A, all fish exposed to 3500 and 4500 mg NO3-N/L died within 48 h; in Trial B, all fish exposed to 3000 NO3-N/L died after 120 h. The 96 LC50 and 168 LC50were 2505 and 1806 mg NO3-N/L, respectively, in Trial A, and 2663 and 2377 mg NO3-N/L in Trial B. Large juveniles were more resistant to NO3-N than small juveniles. The results of acute NO3-N toxicity studies provide important data for subsequent chronic toxicity studies.
순환여과양식 시스템 내 감성돔(Acanthopagrus schlegelii) 치어에 미치는 질산성 질소의 만성적 영향
서석,최태건,박정환 한국수산과학회 2019 한국수산과학회지 Vol.52 No.5
This study evaluated the chronic effects of NO3-N on juvenile blackhead seabream Acanthopagrus schlegelii. The experiment used six identically configured recirculating aquaculture systems (435 L), with three tanks (70 L) each. The NO3-N concentrations studied were 0 (control), 62.5, 125, 250, 500, and 1,000 mg/L NO3-N/L. Thirty juvenile blackhead seabream (18.8±2.2 g) were stocked in each tank. Growth and hematological changes were evaluated after 120 days. At the end of the experiment, the growth, survival, and cortisol levels indicated that blackhead seabream were healthy in 500 mg NO3-N/L. However, insulin-like growth factor I (IGF-1) and the IGF-1 receptor were significantly lower at 250, 500, and 1,000 mg NO3-N/L than in controls (62.5 and 125 mg NO3-N/L). Juveniles were likely affected at a much lower NO3-N concentration than 250 mg/L NO3-N/L in terms of IGF-1 and the IGF-1 receptor. Therefore, for the sake of long-term fish welfare, the NO3-N should be maintained at lower than 250 mg/L for blackhead seabream in recirculating aquaculture systems.