[Antecolic versus retrocolic gastroenteric anastomosis for laparoscopic Roux-en-Y gastric bypass: a prospective randomized control trial].

OBJECTIVE: To compare short-term postoperative outcomes between antecolic and retrocolic laparoscopic Roux-en-Y gastric bypass(LRYGB). METHODS: Forty obesity patients were admitted into The First Affiliated Hospital of Jinan University from March 2008 to July 2010. All patients were randomly assigned to undergo antecolic (group A, 20 cases) and retrocolic (group B, 20 cases) gastroenteric anastomosis. Short-term outcomes were compared. RESULTS: LRYGB procedures were successfully performed in all the 40 patients. There were no significant differences between the two groups in estimated blood loss during surgery, time to flatus passage, time to resumption of oral intake, or length of postoperative hospital stay. The operation time was longer in group B than that in group A [(163.4±28.1) min vs.(131.8±22.7) min, P<0.05]. There were no patients developed internal hernia or anastomotic leakage in either group. Comparison of short-term gastrointestinal symptoms after surgery showed no statistical significance. CONCLUSIONS: Although retrocolic procedure may be closer to anatomical structure, antecolic and retrocolic anastomosis have comparable short-term outcomes after surgery. Further study is warranted to investigate long-term outcomes.

[Treatment of obesity and type 2 diabetes mellitus by laparoscopic Roux-en-Y gastric bypass].

OBJECTIVE: To investigate the efficacy of laparoscopic Roux-en-Y gastric bypass (LRYGB) in the treatment for obesity and type 2 diabetes mellitus (DM). METHODS: Twenty-one cases of obesity and 9 cases of type 2 DM received the LRYGB. Weigh changes, excess body weight lose rate (EWL%) and blood glucose level were measured after surgery and occurrence of complications was observed postoperatively. RESULTS: LRYGB procedures in all the 30 cases were successfully performed with no conversion to open surgery. Average operation time was 168 minutes (110-270 mins), volume of blood loss during the surgery was 24.0 ml (10-75 ml). Twenty-one cases of simple obesity received follow-up from 2 months to 5 years. Body weight and BMI decreased significantly in one month [(85.1+/-10.1) kg vs (97.2+/-15.0) kg, 31.2+/-2.2 vs 35.3+/-3.5, both P<0.01] and to a minimal level in 2 to 3 years [(66.8+/-9.2) kg, 24.3+/-1.1], and then maintained at this level. EWL% was correspondingly higher (all P<0.05). Nine type 2 DM patients were followed up for 3 to 8 months, fasting blood glucose and blood glucose OGTT2 hours decreased significantly [(5.9+/-1.4) mmol/L vs (12.6+/-2.6) mmol/L, (7.8+/-1.4) mmol/L vs (17.8+/-4.1) mmol/L, both P<0.05], of whom 4 patients with obesity decreased in BMI significantly (P<0.05), and 5 patients without obesity had no significant changes in BMI (P>0.05). Five cases (16.7%) had postoperative complications, including 1 case of death due to acute fulminant pancreatitis, 1 case of mesenteric hiatal hernia with obstruction in line for reoperation, and the other 3 cases of healing by conservative therapy. CONCLUSIONS: Treatment of obesity and type 2 DM by LRYGB surgery is feasible with significant short term result. Long term outcome needs further observation.

[Laparoscopic Roux-en-Y gastric bypass surgery for treatment of type 2 diabetes mellitus].

OBJECTIVE: To investigate the surgical approach, feasibility and effectiveness of laparoscopic Roux-en-Y gastric bypass (LRYGB) surgery for treating type 2 diabetes mellitus. METHODS: Seven obese patients with type 2 diabetes and 5 type 2 diabetic patients without obesity received LRYGB surgery. The changes of the body mass, fasting blood glucose (FBG), 2-hour postprandial blood glucose (2 h PBG), C peptide (C-P) and HbA1c% were observed postoperatively. RESULTS: LRYGB procedures were successfully performed in all the 12 patients with no conversion to open surgery. The resolution rate was 85.7% in the obese group and 80% in the non-obese diabetic group. CONCLUSION: LRYGB surgery is feasible for treatment of type 2 diabetes with good short-term result, but the long-term outcome awaits further observation.

Catalyst-assisted solution-liquid-solid synthesis of CdS/CdSe nanorod heterostructures.

We report the synthesis and characterization of axial nanorod heterostructures composed of cadmium selenide (CdSe) and cadmium sulfide (CdS). The synthesis employs a solution-liquid-solid (SLS) mechanism with the assistance of bismuth nanocrystals adhered to a substrate (silicon or a III-V semiconductor). Transmission electron microscopy (TEM) and diffraction studies show that CdSe and CdS segments exhibit the wurtzite (hexagonal) crystal structure with <5% stacking faults. Both of these segments grow along the [002] direction with an epitaxial interface between them. Energy-dispersive X-ray (EDX) spectrometry using a high-resolution TEM operating in scanning mode confirms the alloy-free composition modulation in the nanorod heterostructures, showing that Se and S are localized in the CdSe and CdS portions of the nanorod heterostructures, respectively. This study demonstrates that SLS synthesis provides an alternate route to prepare axial nanorod heterostructures that have been difficult to generate using either vapor-liquid-solid growth or catalyst-free solution-phase synthesis.