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Biomedical subjects

T Yamato

Publications and source records attributed to T Yamato.

67 records · Page 4Linked to original sources
PubMed1979

Esophagoplasty with an autogenous tubed gastric flap.

As an esophageal substitute, a tubed gastric flap 2.5 cm in inner diameter and 38 cm in length, was constructed from the gastric wall along the greater curvature; a pedicle was attached to the gastric antrum, and its oral stump was brought up into the left supraclavicular fossa through a retrosternal tunnel to perform an esophagogastrostomy. Anastomotic breakdown occurred in only three of fifty cases in which this procedure was used.

Esophageal Neoplasms↗
PubMedDate not supplied

Anomalous pancreaticobiliary junction demonstrated by extraductal ultrasonography using transduodenoscopic miniprobe.

We present a case of an anomalous pancreaticobiliary junction (a long common channel) that was clearly demonstrated by extraductal ultrasonography with a transduodenoscopic miniprobe placed in the duodenal lumen. The present case suggests a potential indication for the ultrasound miniprobe, in extraductal ultrasonography, in the pancreatobiliary region. In this method, the position of a miniprobe can readily be adjusted under endoscopic guidance, unlike ordinary endoscopic ultrasonography.

Aged↗
PubMedDate not supplied

Annular pancreas complicated by carcinoma of the bile duct: diagnosis by MR cholangiopancreatography and endoscopic ultrasonography.

It has been reported that annular pancreas should be evaluated for coexisting malignant tumors. However, no cases have been reported in which magnetic resonance cholangiopancreatography and endoscopic ultrasonography clearly demonstrated an annular pancreas complicated by bile duct carcinoma. We present a case that emphasizes the importance of magnetic resonance cholangiopancreatography and endoscopic ultrasonography in directly confirming a diagnosis of annular pancreas complicated by bile duct carcinoma.

Bile Duct Neoplasms↗
PubMedDate not supplied

Spectral tuning of photoactive yellow protein.

We report a theoretical study on the optical properties of a small, water-soluble photosensory receptor, photoactive yellow protein (PYP). A hierarchical ab initio molecular orbital calculation accurately evaluated the optical absorption maximum of the wild-type, as well as the lambda(max) values of 12 mutants. Electronic excitation of the chromophore directly affects the electronic state of nearby atoms in the protein environment. This effect is explicitly considered in the present study. Furthermore, the spectral tuning mechanism of PYP was investigated at the atomic level. The static disorder of a protein molecule is intimately related to the complex nature of its energy landscape. By using molecular dynamics simulation and quantum mechanical structure optimization, we obtained multiple minimum energy conformations of PYP. The statistical distribution of electronic excitation energies of these minima was compared with the hole-burning experiment (Masciangioli, T. [2000] Photochem. Photobiol. 72, 639), a direct observation of the distribution of excitation energies.

Amino Acid Substitution↗
PubMedDate not supplied

Characterization of the mutations of the K-ras, p53, p16, and SMAD4 genes in 15 human pancreatic cancer cell lines.

Human pancreatic cancer is one of the most malignant diseases in the world. In order to save patients with pancreatic cancer, it is necessary to develop novel methods for treatment. For such a purpose, a series of well-characterized cancer cell lines are of great help for in vitro studies that are generally the first step in approaching the invention of novel methods for treatment. In the present study, we analyzed 15 human pancreatic cancer cell lines for genetic alterations of the K-ras, p53, p16, and SMAD4 genes, which are very frequent targets for mutation in pancreatic cancer; these cell lines are useful resources in cancer research.

Adenocarcinoma↗
PubMedDate not supplied

Peroral jejunoscopy for treating stenosis of hepaticojejunostomy after pancreatoduodenectomy.

A 72-year-old woman suffered from relapsing cholangitis after pylorus-preserving pancreatoduodenectomy for chronic pancreatitis. The common hepatic duct had been anastomosed to the jejunum 8 cm distal to the duodenojejunostomy. Peroral jejunoscopy showed a severe stenosis of the hepaticojejunostomy, which was endoscopically enlarged by means of electroincision and balloon dilation, subsequently. No procedure-related complications occurred. The patient has been asymptomatic for 34 months. Most of the strictures of bilioenterostomy are reportedly treated by surgical revision, the percutaneous transhepatic approach, or the percutaneous transjejunal approach. Endoscopic treatment may be attempted in cases in which the postoperative anatomy potentially allows endoscopic access, because of its minimal invasiveness and effectiveness.

Aged↗
PubMedDate not supplied

Endoscopic treatment of hemorrhagic gastric ulcer in patients aged 80 years or more.

BACKGROUND/AIMS: Hemorrhagic gastric ulcer is a more serious disorder in elderly patients than in young patients. This study aimed to evaluate the efficacy of endoscopic treatment for hemorrhagic gastric ulcer in patients aged 80 years or more. METHODOLOGY: A total of 269 patients underwent endoscopic treatment for hemorrhagic gastric ulcer with hemoclipping and pure ethanol injection, either alone or in combination. These patients were divided into two groups: elderly (> or = 80 years old) and younger (< 80 years) groups. The clinical data, endoscopic findings and outcomes of endoscopic treatment were compared between these two groups. RESULTS: Patients in the elderly group had a significantly higher incidence of concomitant disease (73% vs. 23%), anemia (7.9 +/- 2.1 g/dL vs. 9.3 +/- 2.8 g/dL) and large ulcer (23% vs. 6%) compared with the younger group. However, all patients in the elderly group underwent endoscopic hemostasis successfully with no complications and no deaths. The rebleeding rate was not significantly different (8% vs. 4%) between the two groups. CONCLUSIONS: Elderly patients with hemorrhagic gastric ulcer have high incidences of severe ulcer disease and concomitant medical problems. Endoscopic hemostasis for hemorrhagic gastric ulcer is effective and safe, even for such elderly patients.

Aged↗
PubMedDate not supplied

Endoscopic biliary stenting for treatment of bile leakage after hepatic resection.

BACKGROUND/AIMS: Persistent bile leakage after hepatic resection may cause intraperitoneal sepsis and hepatic failure. Surgical treatment for bile leakage carries a high risk. Endoscopic treatment has only infrequently been documented. METHODOLOGY: Ten patients underwent endoscopic biliary stenting without sphincterotomy for persistent (9-138 days; median, 19 days) bile leakage after hepatic resection. Bile leakage was complicated by intraperitoneal sepsis in seven patients. RESULTS: ERCP showed bile leakage from the bile duct stump in nine patients. Stent placement was successful without complications in all 10 patients. Bile leakage disappeared within 1-17 days (mean, 5 days) in all patients. After 55-91 days, the stent was removed and ERCP confirmed disappearance of the leak. No patients have developed recurrent bile leakage for a mean of 4.1 years of follow-up after stent removal. CONCLUSIONS: Endoscopic biliary stenting is a safe and effective treatment for persistent bile leakage after hepatic resection. Endoscopic treatment may eliminate the need for difficult operations in high risk postoperative cases.

Adult↗
PubMedDate not supplied

Preoperative endoscopic pancreatic stenting for safe local pancreatic resection.

Local pancreatic resection and enucleation have the advantage of preserving pancreatic parenchyma but pancreatic fistula often occurs postoperatively. We describe a case in which preoperative endoscopic pancreatic stenting prevented pancreatic fistula formation following local pancreatic resection. A pancreatic stent seems to prevent leakage from small pancreatic branch ducts not identified or ligated intraoperatively, via the pancreatic decompression effect. The present case demonstrates a novel indication for endoscopic pancreatic stenting.

Carcinoma, Pancreatic Ductal↗