Konstantinos Vagenas

Weight Loss, Appetite Suppression, and Changes in Fasting and Postprandial Ghrelin and Peptide-YY Levels After Roux-en-Y Gastric Bypass and Sleeve Gastrectomy A Prospective, Double Blind Study

Background:Bariatric surgery is currently the most effective treatment in morbidly obese patients, leading to durable weight loss. Objective:In this prospective double blind study, we aim to evaluate and compare the effects of laparoscopic Roux-en-Y gastric bypass (LRYGBP) with laparoscopic sleeve gastrectomy (LSG) on body weight, appetite, fasting, and postprandial ghrelin and peptide-YY (PYY) levels. Methods:After randomization, 16 patients were assigned to LRYGBP and 16 patients to LSG. Patients were reevaluated on the 1st, 3rd, 6th, and 12th postoperative month. Blood samples were collected after an overnight fast and in 6 patients in each group after a standard 420 kcal mixed meal. Results:Body weight and body mass index (BMI) decreased markedly (P < 0.0001) and comparably after either procedure. Excess weight loss was greater after LSG at 6 months (55.5% ± 7.6% vs. 50.2% ± 6.5%, P = 0.04) and 12 months (69.7% ± 14.6% vs. 60.5% ± 10.7%, [P = 0.05]). After LRYGBP fasting ghrelin levels did not change significantly compared with baseline (P = 0.19) and did not decrease significantly after the test meal. On the other hand, LSG was followed by a marked reduction in fasting ghrelin levels (P < 0.0001) and a significant suppression after the meal. Fasting PYY levels increased after either surgical procedure (P ≤ 0.001). Appetite decreased in both groups but to a greater extend after LSG. Conclusion:PYY levels increased similarly after either procedure. The markedly reduced ghrelin levels in addition to increased PYY levels after LSG, are associated with greater appetite suppression and excess weight loss compared with LRYGBP.

Changes in aetiology and clinical outcome of acute upper gastrointestinal bleeding during the last 15 years.

Objectives The diagnostic and therapeutic approaches to patients with acute upper gastrointestinal bleeding have been improved during the last decades. The aim of this study was to compare the aetiology and clinical outcome of acute upper gastrointestinal bleeding (AUGIB) between two distinct periods during the last 15 years. Methods The causes of AUGIB and clinical outcome of 668 patients hospitalised with the problem in 1986–1987 were compared to 636 patients with AUGIB in 2000–2001. Patients were admitted to our hospital or they bled while they were inpatients for other reasons. No patient was excluded because of age or concurrent diseases. Endoscopic haemostasis with adrenaline injection for bleeding peptic ulcers was performed in the second period while no endoscopic method of haemostasis was performed in the first period. Results We observed an increase in the age of patients (56.5 ± 16.9 vs 62.9 ± 17.5 years, P < 0.0001) and the percentage of patients who received non-steroidal anti-inflammatory drugs (NSAIDs) before bleeding (from 44% to 63.5%, P < 0.0001). An increase in the diagnosis rate of gastric ulcer (12% vs 19.2%, P = 0.005) and varices (13.2% vs 3.3%, P < 0.001) with a simultaneous decrease in that of erosive gastroduodenitis (18.4% vs 7.2%, P < 0.0001) and duodenal ulcer (48.7% vs 33.3%, P < 0.0001) as a cause of bleeding was also observed. In peptic ulcer bleeding, emergency surgical haemostasis was reduced from 14% to 5.3%, P < 0.001. Overall mortality was also reduced from 5.2% to 3.1% and in peptic ulcer bleeding patients from 3.3% to 2.4%, respectively, but the differences are not statistically significant. Conclusion The aetiology of AUGIB has changed during the last 15 years probably due to the better therapeutic approach to chronic duodenal ulcers and increasing use of NSAIDs in the elderly. Emergency surgical haemostasis has been reduced but the reduction of mortality was not significant.

Assessing Sexual Function in Obese Women Preparing for Bariatric Surgery

Background: Obesity has become a modern epidemic, increasingly affecting the general population worldwide. Obese people are vulnerable to a variety of co-morbidities, including cardiovascular and pulmonary disease, osteoarthritis, diabetes, cancer and psychiatric conditions, that not only diminish life expectancy but also impair quality of life. Research has shown that obesity is further linked to sexual dysfunction, although relevant studies are limited and further investigation is needed. Methods: We assessed the sexual function of 60 obese women scheduled to undergo bariatric surgery and 50 healthy controls matched by age, education and marital status. All participants were administered the Female Sexual Function Index (FSFI). Additionally, participants completed the Hospital Anxiety and Depression Scale (HADS). Results: Obese women reported significant impairment on most domains of sexual function, including sexual desire, arousal, lubrication, orgasm, and satisfaction, compared to healthy controls. The observed sexual impairment was associated with BMI but was not entirely attributed to the presence of anxiety or depression. Conclusion: Obese women complain of significant sexual impairment. Obesity-related sexual dysfunction appears to be a complex condition linked to a range of social, psychological and biological factors. Clinicians are encouraged to evaluate routinely sexual function in this patient population in order to detect those who are in need of intervention.

Mini-laparotomy Cholecystectomy Versus Laparoscopic Cholecystectomy: Which Way to Go?

Purpose The aim of this paper is to report the results of a prospective clinical trial investigating traditional laparoscopic cholecystectomy versus “mini-lap” cholecystectomy in a tertiary care University Hospital. Materials and Methods This is a prospective, randomized, single-center observational study. Forty-four patients were allocated in each group; patients in group L underwent laparoscopic cholecystectomy, whereas patients in group M had open “mini-laparotomy” cholecystectomy with a small incision through the rectus abdominis muscle. Results The operation lasted significantly longer in group L compared with group M, whereas patients of group L had a shorter hospital stay. There was no difference between groups regarding postoperative day on which patients commenced eating. There was no significant difference between groups regarding doses of analgesics used during surgery or in the recovery room. However, patients in group M used significantly more opioids in the postoperative period. Time to resume normal activity was significantly shorter in group L. A very good aesthetic result was obtained in 97.7% of patients in group L and 77.3% of patients in group M. Conclusions Cholecystectomy through a mini-laparotomy incision is a lower-cost, versatile, and safe alternative to laparoscopic cholecystectomy.

Effect of Antioxidant Treatments on the Gut–Liver Axis Oxidative Status and Function in Bile Duct-Ligated Rats

BackgroundExperimental and clinical studies have demonstrated the pivotal role of oxidative stress in the promotion of hepatic and intestinal injury in obstructive jaundice. The present study was undertaken to investigate the effect of well known antioxidant treatments on the gut–liver axis oxidative status and function in bile duct-ligated rats.MethodsA total of 60 male Wistar rats were randomly divided into six groups of 10 animals each: controls, sham operated, bile duct ligated (BDL), and BDL treated with either N-acetylcysteine (NAC), allopurinol, or α-tocopherol (α-TC). Ten days after treatment, the hepatic and intestinal oxidative status was estimated by measuring lipid peroxidation and a battery of biochemical markers comprising the organ’s thiol redox state (i.e., glutathione, cysteine, protein thiols, oxidized glutathione, nonprotein mixed disulfides, oxidized cysteine derivatives, protein symmetrical disulfides, and protein mixed disulfides). Portal and aortic endotoxin concentrations and alanine aminotransferase (ALT) levels were also determined.ResultsAll antioxidant treatments significantly improved intestinal barrier function and protected from cholestatic liver injury, as evidenced by reduction of the portal and aortic endotoxin concentration and ALT levels, respectively. This effect accompanied their significant antioxidant action in both organs, mediated by a certain influence profile on the thiol redox state by each treatment.ConclusionNAC, allopurinol, and α-TC, exerting a potent combined antioxidant effect on the intestine and liver in experimental obstructive jaundice, significantly prevented intestinal barrier dysfunction and liver injury. The variety of results depending on the antioxidant agent that was administered and the marker of oxidative stress that was estimated, indicates that a battery of biomarkers would be more appropriate in assessing pharmacologic responses to therapeutic interventions.

Predictors of hemostatic failure after adrenaline injection in patients with peptic ulcers with non-bleeding visible vessel.

Background: Non‐bleeding visible vessel (NBVV) in patients with bleeding peptic ulcer is associated with a high risk of rebleeding. The aim of this study was to define factors associated with failure of endoscopic hemostasis and rebleeding in patients with NBVV. Methods: Clinical and endoscopic parameters related to failure of endoscopic hemostasis with adrenaline in 191 bleeding peptic ulcer patients with NBVV were evaluated. Results: Endoscopic hemostasis was permanently successful in 154 patients (80.6%). Emergency surgical hemostasis for rebleeding was required in 37 patients (19.4%). Univariate analysis showed that therapeutic failure was significantly related to the presence of shock on admission (P = 0.003), posterior duodenal ulcers (P = 0.001), peptic ulcer history (P = 0.001), previous peptic ulcer bleeding (P = 0.002), or lack of history of non‐steroidal anti‐inflammatory drugs consumption, when compared to use of such drugs (P = 0.04). Patients where therapy failed had lower hemoglobin levels at admission (7.8 ± 1.9 g/dL versus 10 ± 2.4 g/dL, P = 0.005). In a multivariate analysis low hemoglobin (P < 0.001) as well as history of previous peptic ulcer bleeding (P = 0.002) and posterior duodenal ulcers (P = 0.001) were negative predictors. Using the mean value of hemoglobin as the cut‐off point, it is noteworthy that only 2 out of 81 patients (2.5%) who had none of these predictive factors required emergency surgical hemostasis, whereas 34 out of 110 patients (30.9%) with at least one predictive factor required emergency surgery. Conclusion: It is possible, by employing specific characteristics, to define a subgroup of high‐risk patients for rebleeding in patients with NBVV despite therapeutic endoscopy and thus candidates for a complementary endoscopic method of hemostasis or emergency surgical intervention.

BCL-2 and BAX expression and cell proliferation, after partial hepatectomy with and without ischemia, on cholestatic liver in rats: an experimental study

BACKGROUND Liver regeneration after partial hepatectomy (PHx) is regulated by several factors that activate or inhibit hepatocyte proliferation. Apoptosis seems to play an important role in cellular proliferation and liver regeneration. This study investigates the expression apoptosis-associated genes bcl-2 and bax, and the presence of apoptosis and cell proliferation after PHx, in normal and jaundiced rats with or without superimposed ischemia. MATERIALS AND METHODS The study included 50 male Wistar rats assigned into; five groups (10 rats each). On day 0, rats of groups II, IV, and V underwent common bile duct ligation (BDL). On day 10, total liver ischemia (TLI) (occlusion of hepatic artery and portal vein-TLI) for 30 min was performed on animals of group V. When TLI was completed, all 30 animals (of groups I, IV, and V) underwent PHx (68%). Animals of group III underwent only TLI for 30 min. Rats of groups I, IV, and V were sacrificed 24 and 48 h after PHx was completed. Rats of group II were sacrificed 10, 11, and 12 days after BDL. Rats of group III were sacrificed immediately, 24 and 48 h after TLI completion. Liver tissue was obtained and pathologic examination included: (a) H&E stain, (b) in situ hybridization (detection of bcl-2 and bax mRNA) in paraffin sections, (c) Western blot analysis for the evaluation of bcl-2 and bax protein levels, (d) in situ hybridization (TUNEL) for the detection of apoptotic bodies, and (e) immunohistochemical stains (streptavidin-biotin method) in paraffin sections to detect cells that (i) express bcl-2 and bax proteins and (ii) undergo proliferation (Ki67+ cells). Results were expressed following morphometric analysis. RESULTS Before hepatectomy, bcl-2 (protein or mRNA) levels were higher in jaundiced rats vs controls. Furthermore, bax (protein or mRNA) levels and apoptotic body index (ABI) were higher in cholestatic livers. After hepatectomy, there was an early decrease in the protein and mRNA levels of antiapoptotic gene bcl-2 and a late increase of proapoptotic gene bax and the ABI, compared to controls. Cell proliferation of hepatocytes was lower in group V (BDL + TLI) compared to that of groups II and IV (BDL). CONCLUSIONS This study shows that apoptosis takes place in cholestatic livers with or without superimposed ischemia and may contribute in the impaired regenerative response observed in livers of jaundiced rats after partial hepatectomy.