Biomedical subjects

Nobuyasu Takada

Publications and source records attributed to Nobuyasu Takada.

22 records · Page 2Linked to original sources

PubMedDate not supplied

Surgical repair of esophagobronchial fistula caused by radiation injury.

We present an unusual case of a benign esophagobronchial fistula caused by radiotherapy to treat esophageal carcinoma which was closed successfully. A 62-year-old man with superficial squamous cell carcinoma of the esophagus underwent radiotherapy, including 60 Gy externally and 10 Gy intraluminally from January to March 1995. Esophagography revealed a fistula between the esophagus and left main stem bronchus on January 14, 1996. No residual cancer existed. Neither stenting with a silicone tube nor with a covered flexible metallic stent occluded the fistula. Thoracic esophagectomy, closure of the esophagobronchial fistula using a 2-cm nubbin of esophageal wall, surrounding the orifice of the fistula and antesternal gastric pull-through reconstruction with mediastinal lymphadenectomy were performed. The postoperative course was uneventful and there is no evidence of recurrence of the fistula or the cancer 5 years postoperatively. Radiotherapy may cause esophagobronchial fistula even in cases of superficial esophageal cancer. Bypass surgery should be considered because stenting is not effective for benign fistula without stricture.

Bronchial Fistula↗

PubMedDate not supplied

Correlation between duodenogastric reflux and remnant gastritis after distal gastrectomy.

BACKGROUND/AIMS: Many patients who undergo distal gastrectomy develop remnant gastritis. This report describes the correlation between remnant gastritis and the amount of duodenogastric reflux and looks at the relationship between Helicobacter pylori infection and duodenogastric reflux in remnant gastritis. METHODOLOGY: Sixty-two patients who underwent curative distal gastrectomy for gastric cancer with radical lymphadenectomy were studied. The period of bile reflux (percent time) into the gastric remnant was measured with the Bilitec 2000 under standardized conditions. Remnant gastritis was semi-quantified using the neutrophil infiltration score based on the updated Sydney System, and the presence of H. pylori infection was determined 12 weeks after the surgery. RESULTS: Overall, the correlation was not significant between the neutrophil infiltration score and the percent time (p=0.08). Similarly, the correlation was not significant in patients with H. pylori infection (p=0.30), but it was significant in patients without H. pylori infection (p=0.03). CONCLUSIONS: Duodenogastric reflux after distal gastrectomy can cause remnant gastritis in patients without H. pylori infection. Reconstruction with biliary diversion is protective against the development of remnant gastritis.

Adult↗

PubMedDate not supplied

Effect of H. pylori on COX-2 expression in gastric remnant after distal gastrectomy.

BACKGROUND/AIMS: Helicobacter pylori infection is known to induce gastritis, oxidative stress, and cyclooxygenase (COX)-2 expression in the gastric mucosa. However, the effect of H. pylori infection on remnant gastritis has not been studied. We investigated whether the severity of remnant gastritis and COX-2 expression were affected by H. pylori infection after distal gastrectomy. METHODOLOGY: The study included 97 patients with gastric cancer who underwent curative distal gastrectomy with lymphadenectomy in our department between May 1999 and April 2001. All patients underwent endoscopic examination 2 weeks before and 12 weeks after surgery. The presence of H. pylori infection was determined by urease activity, hematoxylin-eosin staining, and immunochemical staining. Histologic remnant gastritis was graded based on the degree of neutrophil infiltration using the updated Sydney System. COX-2 expression was estimated immunohistochemically. RESULTS: Both the degree of neutrophil infiltration and the level of COX-2 expression were significantly higher in patients with than without H. pylori (p<0.05). There was a significant correlation between the degree of neutrophil infiltration and the degree of COX-2 expression (p<0.001). CONCLUSIONS: H. pylori eradication may become a treatment for preventing both remnant gastritis as well as remnant gastric carcinoma after distal gastrectomy.

Adult↗

PubMedDate not supplied

Duodenogastric reflux eradicates Helicobacter pylori after distal gastrectomy.

BACKGROUND/AIMS: Patients who undergo distal gastrectomy often develop duodenogastric reflux and preoperative H. pylori infection is eradicated spontaneously after distal gastrectomy in some patients. However, whether a causal relationship exists has not yet been studied. This report examines the correlation between H. pylori eradication and the amount of duodenogastric reflux following distal gastrectomy. METHODOLOGY: Among 72 consecutive patients who underwent curative distal gastrectomy with radical lymphadenectomy for gastric cancer, 37 patients had H. pylori infection preoperatively and were included in this study. The period of bile reflux (percent time) into the gastric remnant was measured with the Bilitec 2000 under standardized conditions on the 14th day after the surgery. Endoscopic examination was performed to determine the presence of H. pylori infection on week 12 after surgery. RESULTS: The percent time was higher in patients whose H. pylori infection had been eradicated after distal gastrectomy (58.1+/-9.2%) than in patients who had H. pylori infection after distal gastrectomy (33.8+/-5.7%). CONCLUSIONS: Duodenogastric reflux correlates with spontaneous eradication of H. pylori infection following distal gastrectomy.

Adult↗