Vancomycin-Loaded Polycaprolactone Electrospinning Nanofibers Modulate the Airway Interfaces to Restrain Tracheal Stenosis

Site-specific release of therapeutics at the infected trachea remains a great challenge in clinic. This work aimed to develop a series of vancomycin (VA)-loaded polycaprolactone (PCL) composite nanofiber films (PVNF-n, n = 0, 1, and 5, respectively) via the electrospinning technique. The physiochemical and biological properties of PVNF-n were evaluated by a series of tests, such as FT-IR, XRD, SEM-EDS, and antibacterial assay. The PVNF-n samples displayed a typical network structure of fibers with random directions. VA was successfully introduced into the PCL nanofibers and could be sustained and released. More importantly, PVNF-5 showed relatively good antibacterial activity against both methicillin-resistant Staphylococcus aureus (MRSA) and Streptococcus pneumoniae (SPn). Thus, PVNF-5 was covered onto the self-expandable metallic stent and then implanted into a New Zealand rabbit model to repair tracheal stenosis. Compared to a metallic stent, a commercial pellosil matrix–covered stent, and a PVNF-0–covered metallic stent, the PVNF-5–covered airway stent showed reduced granulation tissue thickness, collagen density, α-SMA, CD68, TNF-α, IL-1, and IL-6 expression. In conclusion, this work provides an anti-infection film–covered airway stent that in site restrains tracheal stenosis.

A case of hemobilia caused by pancreatic metastasis of renal cell carcinoma treated with a covered metallic stent

We present the case of an 86-year-old man who had undergone left nephrectomy for renal cell carcinoma (clear cell carcinoma) 22 years ago. He visited the emergency department complaining of right hypochondrial pain and fever. He was eventually diagnosed with acute cholangitis. Abdominal contrast-enhanced computed tomography showed multiple tumors in the pancreas. The tumor in the pancreatic head obstructed the distal bile duct. Endoscopic retrograde cholangiopancreatography detected bloody bile juice flowing from the papilla of Vater. Therefore, he was diagnosed with hemobilia. Cholangiography showed extrinsic compression of the distal bile duct; a 6 Fr endoscopic nasobiliary drainage tube was placed. Endoscopic ultrasound showed that the pancreas contained multiple well-defined hypoechoic masses. Endoscopic ultrasound-guided fine-needle aspiration was performed using a 22 G needle. Pathological examination revealed clear cell carcinoma, and the final diagnosis was pancreatic metastasis of renal cell carcinoma (RCC) causing hemobilia. A partially covered metallic stent was placed in the distal bile duct. Consequently, hemobilia and cholangitis were resolved.

Stent Flange-Induced Esophageal Stricture Treated with an Oral Steroid

Esophageal stent complications include stent migration, tumor ingrowth, perforation, a broncho-esophageal fistula, and gastroesophageal reflux. Development of a new stricture at a flange site after stent removal has been predicted but not yet reported. We experienced the first case of a recurrent esophageal stricture induced by a stent flange after stent removal. A fully covered metallic stent, which had been inserted 2 months ago for treatment of an anastomotic stricture, triggered another stricture at the flange site. Although endoscopic balloon dilatations were repeated several times and then the 2nd stent for rescue therapy was inserted, the stricture was refractory to all treatment. Thus, we prescribed oral prednisolone with repeated endoscopic balloon dilation; the stricture eventually improved. The oral steroid seemed to suppress stricture development. If a stent flange-induced refractory stricture is encountered, an oral steroid combined with endoscopic balloon dilation may be helpful.

Manejo y diagnóstico del colangiocarcinoma formador de masa a propósito de un caso

Cholangiocarcinoma is a rare and aggressive adenocarcinoma that arises from epithelial cells of the biliary tract, the intrahepatic has a very low incidence worldwide < 10% in relation to extrahepatic patients. We present this case of an elderly female patient with no history of importance and risk factors that help us discern her etiology, imaging studies, therapeutic that were provided by the endoscopic retrograde cholangiopancreatography with the placement of 10 x 80 mm partially covered metallic stent for biliary drainage as a palliative measure.