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Biomedical subjects

Hiroshi Maekawa

Publications and source records attributed to Hiroshi Maekawa.

6 recordsLinked to original sources
PubMed2005

Clinical review: Tokyo - protecting the health care worker during a chemical mass casualty event: an important issue of continuing relevance.

Determine the effectiveness of decontamination, and perform thorough dry or wet decontamination, depending on the circumstances. Always remain cognizant of the fact that, even after decontamination has been completed, contamination may not have been completely eliminated. Perform periodic monitoring to determine whether secondary exposure has occurred in health care workers; if it appears that secondary exposure has occurred, then the PPE level must be increased and attempts must be made to identify and eliminate the source of the contamination. Finally, if the victims were exposed through ingestion, then consider the possibility that secondary exposure will occur during gastric lavage.

Chemical Terrorism↗
PubMed2003

Multiple esophagogastric granular cell tumors.

Multiple granular cell tumors of the esophagus and the stomach found in a 53-year-old man are reported. One lesion was detected within the lower thoracic esophagus and seven lesions were detected in the stomach. The esophageal tumor was resected endoscopically, and gastrectomy was performed for the multiple gastric lesions. Histologically, the tumors consisted of spindle or polyhedral cells and the cytoplasm contained punctated eosinophilic granules with positive immunohistochemical staining for S-100 protein. The tumors were mainly located in the submucosal layer. Some tumor cells were seen in the mucosae propria and the muscularis propria. The tumor cells were only slightly positive for p53- and Ki-67-immunohistochemical stainings. Based on these findings, we diagnosed the granular cell tumors as benign. Granular cell tumor is comparatively rare in clinical practice, but a few such tumors have been seen in the digestive tract. A few cases of multiple esophagogastric granular cell tumors have also been reported in the literature.

Esophageal Neoplasms↗
PubMed2003

A case of triple synchronous cancers occurring in the gallbladder, common bile duct, and pancreas.

We report a 74-year-old man with triple synchronous cancers occurring in the gallbladder, common bile duct, and pancreas. The patient had consulted a nearby physician because of epigastralgia and icterus. On September 30, 1997, the patient was admitted to our department for further evaluation and treatment. Abdominal computed tomography (CT) showed dilatation of the common bile duct, cystic duct, and intrahepatic bile duct, and swelling of the gallbladder. On CT, the wall of the distal common bile duct was thick and a low-density mass was detected on the left side. Cholangiography, performed via percutaneous transhepatic cholangiodrainage (PTCD), revealed stenosis of the distal common bile duct. Endoscopic retrograde pancreatography (ERP) showed marked dilatation of the main pancreatic duct. On October 17, 1997, pancreatoduodenectomy was performed under the diagnosis of carcinoma of common bile duct and pancreas. Histopathological examination revealed poorly differentiated tubular adenocarcinoma of the common bile duct, well-differentiated tubular adenocarcinoma of the gallbladder, and mucinous cystadenocarcinoma of the pancreas. These three tumors were histopathologically different. Moreover, p53-positive nuclei were recognized only in the pancreas tumor. These findings suggested that the oncogenic mechanisms of multiple synchronous cancers were not the result of only abnormal DNA reparative mechanisms.

Adenocarcinoma↗
PubMed2002

Extensive hemorrhagic erosive gastritis associated with acute pancreatitis successfully treated with a somatostatin analog.

In massive hemorrhage from acute gastric mucosal lesions, it is occasionally difficult to control the bleeding with nonsurgical therapy. We used the somatostatin analog, octreotide, which suppresses gastric and pancreatic function, to treat severe hemorrhagic erosive gastritis in a patient with acute pancreatitis. A 22-year-old man presented with epigastralgia and melena. Blood levels of pancreatitis markers were elevated. Computed tomography revealed diffuse enlargement of the pancreas, without fluid collection around the organ. An endoscopic examination showed extensive hemorrhagic erosions over almost the whole gastric mucosa. We diagnosed extensive hemorrhagic erosive gastritis with acute pancreatitis. A protease inhibitor (nafamostat mesilate 50 mg/day) and an H(2) receptor antagonist (famotidine 40 mg/day) were administered by injection for 6 days; the patient's serum and urine amylase levels fell, but the gastric erosions with hemorrhage were not attenuated. Octreotide was given subcutaneously, at a daily dose of 100 microg for 5 days, without famotidine administration. His melena disappeared, and the gastric erosions were markedly decreased. Administration of the somatostatin analog, octreotide, proved to be effective treatment in a patient with severe hemorrhagic erosive gastritis associated with acute pancreatitis.

Acute Disease↗