Resveratrol attenuates oxidative stress and histological alterations induced by liver ischemia/reperfusion in rats

This study was designed to determine the effects of intraperitoneally or orally administered N-acetylcysteine (NAC) on wound healing following resection and anastomosis of a colon segment with ischemia/reperfusion injury. Forty female Spraque-Dawley rats were randomly allocated to one of four groups containing 10 rats each: (1) normal resection plus anastomosis; (2) ischemia/reperfusion plus resection plus anastomosis; (3) ischemia/reperfusion plus resection plus anastomosis plus intraperitoneal NAC; (4) ischemia/reperfusion plus resection plus anastomosis plus oral NAC. Group comparison showed that the anastomosis bursting pressure was significantly higher in group 3 than in the other groups. The mean tissue hydroxyproline concentration in the anastomotic tissue was significantly lower in group 2 than in the other groups. The collagen deposition was significantly increased on day 7 in groups 3 and 4 compared to the other groups. In conclusion, this study demonstrates that NAC significantly prevents the effects of reperfusion injury on colonic anastomoses in a rat model.

Free radicals are chemicals that play roles in the etio-pathogenesis of ischaemia-reperfusion injury. Various antioxidants have been used in an attempt to mitigate the damage induced by these chemicals. In the present study, the antioxidative effects of grape seed extract (proanthocyanidin), tomato extract (lycopene), and vitamin C (ascorbic acid) on a composite re-established-flow inferior epigastric artery based rectus abdominis muscle-skin flap model on which experimental ischaemia was induced were investigated. The rats have been administered antioxidants for 2 weeks prior to the surgery and for 2 more weeks thereafter. Macroscopic, histopathological, and biochemical analyses were carried out at the decision of the experiment. It was found that flap skin island necrosis was significantly reduced in the proanthocyanidin, lycopene, vitamin C groups (p < 0.001). Statistical analyses showed significant decreases in inflammation, oedema, congestion, and granulation tissue in the proanthocyanidin and lycopene groups compared to the vitamin C and control groups (p < 0.001). When the viability rates of fat and muscle tissues were examined, significant improvements were found in the proanthocyanidin and lycopene groups in comparison to the other groups (p < 0.001). Serum antioxidant capacity measurements revealed significant differences in the lycopene group compared to all other groups (p < 0.001). It is concluded that lycopene and proanthocyanidin are protective antioxidants in rat composite muscle-skin flap ischaemia-reperfusion models.

Background/Aims: Patients with colorectal cancer continue to present with relatively advanced tumors that are associated with poor oncological outcomes. The aim of the present study was to assess the association between localization, symptom duration, and tumor stage. Materials and Methods: A prospective, multicenter cohort study was conducted on patients newly diagnosed with a histologically proven colorectal adenocarcinoma. Standardized questionnaire-interviews were performed. Data were collected on principal presenting symptoms, duration of symptoms (time to first presentation to a doctor and time to diagnosis) and treatment, diagnostic procedures, tumor site, and stage of the tumor (tumor, node, and metastasis (TNM)). Results: A total of 1795 patients with colorectal cancer were interviewed (mean age: 60.76±13.50 years, male patients: 1057, patients aged >50 years: 1444, colon/rectal cancer: 899/850, right side/left side: 383/1250, stage 0-1-2/stage 3-4: 746/923). No statistically significant correlations were found between duration of symptoms and either tumor site or stage. Principal presenting symptoms were significantly associated with left colon cancer. Patients who had “anemia,” “change in bowel habits,” “anal pruritus or discharge,” “weight loss,” and “tumor in right colon” had a significantly longer symptom time. Conclusion: Symptom duration is not associated with localization, nor is the tumor stage. Diagnosis of colorectal cancer at an earlier stage may be best achieved by screening of the population.

Purpose: Polymeric clips (Hem-o-lok ligation system) are now widely used to securing the base of the appendix during laparoscopic appendectomy. Studies comparing the use of single or double hem-o-lok clips are limited. The aim of this study was to compare the reliability of a single hem-o-lok clips with a double hem-o-lok clips for closure of an appendiceal stump. Methods: This prospective randomized study includes patients from two centers who underwent laparoscopic appendectomy with the diagnosis of appendicitis between September 2020 and March 2023. Demographic, operative and clinical outcomes of the use of single or double hem-o-lok clips for closure of the appendiceal stump were compared. Factors affecting long postoperative hospital stay were investigated using univariate and multivariate analyzes. Results: One hundred forty two (48.3%) patients in the single hem-o-lok arm and 152 (51.7%) patients in the double hem-o-lok arm were included in the analysis.The shortest operative time was noted in the single hem-o-lok group (52.1 ± 19.9 versus 61.6 ± 24.9 min, p < 0.001). The median hospital stay was 1 day (range 1–10) in the single hem-o-lok group and 1 day (range 1–12) in the double hem-o-lok group, and was shorter in the single hem-o-lok arm (1.61 ± 1.56 vs 1.84 ± 1.69, p = 0.019). Based on multivariate analysis, drain placement was identified as an independent predictive factor for long hospital stay. Conclusions: The use of single hem-o-lok clips for appendiceal stump closure during laparoscopic appendectomy is safe and effective. Trial registration NCT04387370 (http://www.clinicaltrials.gov).

Background: Breast cancer is the most common cancer in women over the age of 40. The lifetime risk is around 12%. Today, breast cancer patients are diagnosed at an early stage thanks to screening programs, and thus mortality has decreased to around 25-30%. The positivity or closeness of surgical margins in breast conserving surgery varies between 5-60%. Negativity of surgical margins is very important to prevent future recurrent breast cancer, to pre-vent recurrent surgeries, and to prevent additional treatments. In this study, we aimed to investigate the efficacy of intraoperative ultrasonography and frozen section use in breast cancers treated with breast conserving surgery in obtaining safe surgical margins and in postoperative cosmetic terms. Materials and Methods: This study includes 150 patients diagnosed with breast cancer and treated with breast con-serving surgery in between January 2015 and January 2019. The presence of distant metastases and multifocal or centrally located tumor involvement in the breasts were investigated. The localization of the tumor was marked anatomically by preoperative ultrasonography in all patients. The operation was started 15 minutes after the injec-tion. The tumor was completely excised, leaving at least 1 cm of intact tissue around the tumor, including the skin, on the preoperatively marked area, including the underlying muscle fascia. Medial and superior borders were marked with string. This excised tissue block was examined with intraoperative ultrasonography. Results: The mean age of the patients was 48,3± 9.7 years. While the tumor was located in the right breast in 83 (55.3%) of the patients, it was located in the left breast in 67 (44.7%) patients. The tumor was located in the upper outer quadrant in 67 (44.7%) patients, in the upper inner quadrant in 53 (35.3%) patients, and in the lower outer quadrant in 30 (20%) patients. Axillary dissection was performed in 21 (14 %) of the patients because sentinel lymph node was positive. In histological typing, 141 (94 %) patients were ductal carcinoma and 9 (6 %) patients were lobular carcinoma. Conclusions: As a result of our study and literature review, we think that frozen examination together with intraope-rative ultrasonography is a simple, easily applicable and cosmetically good method to determine the safe surgical margin in breast conserving surgery.