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Masahito Sato

Publications and source records attributed to Masahito Sato.

5 recordsLinked to original sources
PubMed2006

Antenatal magnetic resonance imaging is useful in providing predictive values for surgical procedures in abdominal wall defects.

BACKGROUND: Antenatal magnetic resonance imaging (MRI) is useful for the diagnosis of abdominal wall defects. Its predictive value concerning the possibility of primary closure of the abdominal wall, however, has so far not been reported. METHODS: Between August 2001 and November 2004, antenatal MRI was performed on 9 patients with abdominal wall defects in whom surgical repair was performed immediately after birth. Areas of the abdominal cavity and exteriorized viscera were manually traced from both sagittal and axial MR images, and the data were further transmitted to a Workstation for MRI Volumetry (Advantage Windows 4.1, General Electric Medical Systems, Milwaukee, Wis). We examined the exteriorized ratio (ER), which is calculated by dividing the absolute volume of the abdominal cavity by that of the exteriorized viscera, and evaluated the predictive value by a retrospective comparison with surgical procedure. RESULTS: In the primary closure group (n = 5), mean values of ER were 0.33 +/- 0.31 from axial and 0.45 +/- 0.31 from sagittal MR images. In contrast, in the staged closure group (n = 4), mean values of ER were 1.39 +/- 0.40 from axial and 1.34 +/- 0.42 from sagittal MR images. There was a significant difference (P < .05) between the 2 groups for both sets of images. The ER obtained from antenatal MRI correlated well with surgical procedure. CONCLUSIONS: The ER might be useful for antenatal counseling, planning for delivery, and prediction of the most likely surgical procedure.

Abdominal Wall↗
PubMed2006

Increased incidence of transient left ventricular apical ballooning (so-called 'Takotsubo' cardiomyopathy) after the mid-Niigata Prefecture earthquake.

BACKGROUND: On October 23, 2004, a major earthquake, which registered 6.8 on the Richter scale, occurred in Niigata Prefecture in Japan. Emotional stress is important as a trigger of transient left ventricular apical ballooning (so-called 'Takotsubo' cardiomyopathy), but its incidence and clinical profile immediately after a natural disaster have not been fully elucidated. METHODS AND RESULTS: 'Takotsubo' cardiomyopathy was diagnosed in 16 patients (1 man, 15 women, mean age 71.5 years) within 1 month after the earthquake. Of them, 13 (81%) lived in areas where the Japan Meteorological Agency seismic intensity scale registered 6 or above, and 11 (69%) developed symptoms on the day of the earthquake. The incidence of 'Takotsubo' cardiomyopathy 1 month after the earthquake was approximately 24-fold higher near the epicenter than that before the earthquake. CONCLUSION: 'Takotsubo' cardiomyopathy can occur on the day of the earthquake in elderly women living near the epicenter.

Age Factors↗
PubMed2005

Thoracoscopic diaphragmatic procedures under artificial pneumothorax.

Diaphragmatic plication is technically simple using a conventional operative technique, but it requires a large skin incision and rib injury. We present an alternative technique for thoracoscopic plication of the diaphragm and evaluate the advantages of the procedure. Six patients (five with diaphragmatic eventration and one with diaphragmatic hernia with a sac) ranging in age from 8 to 20 months were treated by this method. Three of the six cases were right-sided, and three were left-sided. The operation was performed under artificial pneumothorax using carbon dioxide gas at 4 mmHg. Three trocars for laparoscopy were inserted at the 4th and 5th intercostal spaces. An adequate operative view was obtained by pressing the diaphragm throughout the operation. The eventrated diaphragm was plicated with several rows of nonabsorbable sutures in the anterolateral-to-posterolateral direction to prevent injury to the main phrenic nerve. A tight diaphragm was confirmed by decompressing the artificial pneumothorax. The technique was successfully performed in all cases, and the patients' postoperative courses were uneventful. During the operation, the hemodynamic effects of carbon dioxide gas at 4 mmHg were minimal. Over a mean follow-up period of 3.1 years (range, 1-6 years), no recurrence of diaphragmatic eventration was seen. Judging from the satisfactory postoperative course, this procedure is suitable for children with all forms of diaphragmatic eventration.

Diaphragmatic Eventration↗
PubMed2003

Atypical ductal hyperplasia of the pancreas associated with a stricture of the main pancreatic duct.

Atypical ductal hyperplasia of the pancreas is thought to be a precancerous lesion. We report a case of atypical ductal hyperplasia associated with a stricture of the main pancreatic duct. A 70-year-old man was admitted to our hospital because of abdominal pain with an elevated serum pancreatic isoamylase level. Endoscopic retrograde cholangiopancreatography disclosed a stricture of the main pancreatic duct in the body of the pancreas. Cytological evaluation of endoscopic brushings suggested adenocarcinoma. Distal pancreatectomy was performed. Microscopic examination of the stenotic pancreatic duct showed a hyperplastic epithelium without atypia. Atypical hyperplasia, however, was found in the distal portion of the main pancreatic duct in close proximity to the stricture. Atypical hyperplasia extended along the main pancreatic duct into the ductal branches of the pancreatic tail. In contrast to the vast majority of patients with atypical hyperplasia, the atypical hyperplasia seen in the present patient had no histological features suggestive of intraductal extension of the invasive carcinoma or intraductal papillary-mucinous tumor, thus representing a sporadic precancerous lesion, and it may have been equivalent to carcinoma in situ. Pancreatic duct stricture and the resultant stasis of the pancreatic juice may have promoted the atypical changes in the ductal cells upstream of the stricture.

Adenocarcinoma↗