相互相関型および多次元デコンボリューション型地震波干渉法による地震波の再現とその応用

京都大学0048新制・課程博士博士(工学)甲第16813号工博第3534号新制||工||1534(附属図書館)29488京都大学大学院工学研究科社会基盤工学専攻(主査)教授 松岡 俊文, 教授 清野 純史, 教授 三ケ田 均学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA

Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records

We estimated the changes in seismic velocity in the southern Tohoku district of Japan during the six-month period centered on the 11 March 2011 Tohoku-oki earthquake, using scattered waves retrieved by autocorrelation of ambient seismic noise. The estimated velocity decrease after the earthquake, and after two large aftershocks in the study area, was as great as 1.5% in the area nearest to the mainshock. The velocity changes displayed gradual healing. The spatial distribution of the velocity change showed a correlation with both the changes in static strain, derived from GPS records, and the peak particle velocity experienced during the three earthquakes, derived from strong-motion records. Therefore, our results show that velocity changes possibly contain information from deep in the crust bearing on coseismic stress release, in addition to shallower effects due to strong ground motion

One-Stage Laparoscopic Surgery for Pulmonary Sequestration and Hiatal Hernia in a 2-Year-Old Girl

We herein report a case of one-stage laparoscopic surgery for extralobar pulmonary sequestration (EPS) and hiatal hernia. Our patient was a 2-year-old girl who was diagnosed as a mediastinal mass lesion. Postnatal computed tomography revealed that the mediastinal mass was an EPS. Two weeks after birth, the patient developed gastroesophageal reflux (GER), and esophagography showed a hiatal hernia. At 2 years of age, she underwent one-stage laparoscopic Nissen's fundoplication for GER with resection of the EPS in the posterior mediastinum. The sequestrated lung was grasped via the esophageal hiatus; three aberrant blood vessels were dissected to allow removal of the sequestration through the umbilical port site. The esophageal hiatus was repaired and Nissen's fundoplication was performed laparoscopically. The patient's postoperative course was uneventful, with no recurrence of GER symptoms for 1 year. We conclude that one-stage laparoscopic surgery is useful for patients with EPS and hiatal hernia

Nissen fundoplication for gastroesophageal reflux: No deterioration of gastric emptying measured by 13C-acetate breath test

Aim: To study the gastric emptying 30 days after laparoscopic Nissen fundoplication (NF) in gastroesophageal reflux. Materials and Methods: Three patients were evaluated with 13 C-acetate breath test (ABT) performed pre and post-NF. The liquid test meal consisted of Racol TM mixed with 13 C-acetate. Results: In the patient without neurological impairment (NI), the preoperative t 1/2 ex and t lag were 0.900 and 0.510 hours, respectively. The postoperative t 1/2 ex and t lag were 0.959 and 0.586 hours, respectively. In one patient with NI, the preoperative t 1/2 ex and t lag were 1.828 and 1.092 hours, respectively. The postoperative t 1/2 ex and t lag were 2.081 and 1.025 hours, respectively. In the other patient with NI, the preoperative t 1/2 ex and t lag were 2.110 and 0.980 hours, respectively. The postoperative t 1/2 ex and t lag were 1.118 and 0.415 hours, respectively. Conclusions: Our findings suggest that 13 C-ABT parameters did not worsen in any of the children after laparoscopic NF

Factors Associated with the Risk of Persistent Gastrostomy Site Infection Following Laparoscopic or Open Nissen Fundoplication

Background: Gastrostomy for feeding disorders or swallowing dysfunctions can be complicated by persistent gastrostomy site infection (PGSI). PGSI causes nutrient leakage, with dilated PGSI requiring gastrostomy reconstruction. The purpose of this study was to evaluate the causes, patient characteristics, and perioperative management of PGSI after Nissen fundoplication and gastrostomy for patients with gastro-oesophageal reflux. Patients and Methods: The records of all patients who underwent Nissen fundoplication and gastrostomy for gastro-oesophageal reflux over the past 12 years were retrieved. Risk factors were analysed, including age at surgery, gender, operative procedure, use of postoperative ventilator management, gastrostomy tube migration towards the pylorus, bacterial culture results, and length of hospital stay. PGSI as a cause of inflammation was analysed statistically. Results: Forty patients were identified, ranging in age from 1 to 49 years (median, 11 years) surgically. Twenty each underwent laparoscopic and open surgery, with all undergoing gastrostomy using the Stamm technique. Four patients developed PGSI. Gastrostomy tubes had migrated postoperatively to the pyloric side in three of these four patients (P < 0.005), increasing intragastric pressure. Three of these four patients also required positive pressure ventilation during the perioperative period (P < 0.001). Conclusion: PGSI correlates with the perioperative management of positive pressure and with increased intragastric pressure resulting from pyloric obstruction, which is caused by aberrant distribution of the gastrostomy tube to the pyloric side. Statistical Analysis Used: Factors in the two groups were compared statistically by Mann–Whitney U-test to determine whether PGSI caused inflammation. Statistical significance was defined as P < 0.05

A staged operation for anopenile urethral fistula

Anopenile urethral fistula (APUF) is not rare, but there are only a few detailed reports regarding its surgical treatment. We describe a patient with APUF who had no anal opening, and meconium was discharged from the external urethral orifice. The patient was treated with a staged operation