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Search Results: 1 - 10 of 4858 matches for " Hiroshi Iida "
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Cerebral Infarction after Spine Surgery: Report of Two Cases  [PDF]
Katsunori Fukutake, Hiroshi Takahashi, Yuichiro Yokoyma, Yasuaki Iida, Ryo Takamatsu, Kazumasa Nakamura, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.34037
Abstract: There has been an increase in spinal surgery for the elderly, with a corresponding potential increase in perioperative complications. In our department, 1833 patients underwent spinal surgery under general anesthesia from April 2001 to October 2012, and 2 of 260 patients aged ≥75 years old had postoperative cerebral infarction. An analysis of the pathogenic mechanism and potential risk factors showed that a history of cerebral infarction was a significant risk factor. Blood pressure rapidly increased on arousal from anesthesia, and particularly on extubation. The change in blood pressure was examined as a potential risk factor for cerebral infarction, but no significant relationship was observed. This result requires further examination in more patients with cerebral infarction after spinal surgery.

Calculation of Forest Potential Evapotranspiration of Okinawa in Japan Using the Penman Equation  [PDF]
Takuya Arakaki, Akira Shimizu, Naoki Kabeya, Hitoshi Ikuzawa, Takanori Shimizu, Shin’ichi Iida, Hiroshi Furugen
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.69077

The northern area of Okinawa Island is a unique forest area in Japan, with a distinctive ecosystem and subtropical climate. The area is a central region of forestry in Okinawa Prefecture. However, quantitative evaluation of the effects of the forest environment is inadequate. The authors began meteorological observation of this forested area to address this situation by setting up a weather station in 2009. In this study, we performed research on one of the major factors of the water cycle in forest ecosystems, evapotranspiration. We calculate seasonal changes in potential evapotranspiration through analysis of data from our weather station in 2013, because all measurement elements were assembled. To calculate potential evapotranspiration, we used the Penman equation. We found that the potential evapotranspiration in this forest area was 1170.5 mm in 2013. The mean temperature in 2013 was 20.7°C, yearly average relative humidity was 84.7%, and average wind speed was 1.40 m/s. Regarding the amount of evapotranspiration in the forests of northern Okinawa Island, which has not been previously obtained, it has become possible to calculate the amount of potential evapotranspiration using the Penman equation.

A Case of Acute Cauda Equina Syndrome for Combined Lumbar Ossification of the Posterior Longitudinal and Yellow Ligament  [PDF]
Kazumasa Nakamura, Yuichirou Yokoyama, Akihito Wada, Yasuhiro Inoue, Keiji Hasegawa, Shintaro Tsuge, Hiroshi Takahashi, Yasuaki Iida
Open Journal of Orthopedics (OJO) , 2014, DOI: 10.4236/ojo.2014.46024
Abstract: Acute cauda equina syndrome is known as a symptom of lumbar disc herniation, but to date, there have been no reports of cases caused by lumbar vertebral ligament ossification. We encountered a 61-year-old female patient with acute cauda equina syndrome associated with lumbar vertebral OPLL and OLF. The symptoms were improved by emergency laminectomy. One year after the surgery, the disturbances of gait and urination have been resolved.

A Case of Thoracic Disc Herniation Extruded to the Dorsal Epidural Space  [PDF]
Shigeta Takeuchi, Yuichirou Yokoyama, Yasuaki Iida, Keiji Hasegawa, Akihito Wada, Ryoichi Fukano, Kazutoshi Shibiuya, Hiroshi Takahashi
Open Journal of Orthopedics (OJO) , 2015, DOI: 10.4236/ojo.2015.58030
Abstract: We encountered a patient with thoracic disc herniation that extruded to the dorsal epidural space. The patient was a 78-year-old man in whom listlessness of the lower limbs developed without an inducer and walking became difficult. The patient was diagnosed as having a thoracic spinal cord tumor on MRI by a physician, and was referred to our hospital. Since ring enhancement was observed on contrast MRI performed at our hospital, the patient was diagnosed with disc herniation and surgery was performed. A hernia continuous with the intervertebral space that extruded to the dorsal epidural space was excised. At the final follow up, 1 year and 4 months after surgery, the patient could walk with a cane. Among thoracic disc herniation cases, hernia extruded to the dorsal epidural space is rare and difficult to diagnose by imaging before surgery, but evaluation using contrast MRI is useful in the diagnosis. When a space-occupying lesion is observed in the spinal canal in the lower thoracic spinal region, it is necessary to evaluate it by contrast MRI in consideration of thoracic disc herniation.
Spinal Epidural Cavernous Hemangioma of the Thoracic Spine: A Case Report  [PDF]
Ryoichi Fukano, Yasuaki Iida, Keiji Hasegawa, Yuichirou Yokoyama, Akihito Wada, Shigeta Takeuchi, Kazutoshi Shibuya, Hiroshi Takahashi
Open Journal of Orthopedics (OJO) , 2015, DOI: 10.4236/ojo.2015.510042
Abstract: Cavernous hemangiomas can arise in any region of the body, including the central nervous system. Spinal cavernous hemangiomas account for 5% - 12% of all cases of vertebral vascular malformation. Most of these are of vertebral origin, and cases that are non-vertebral in origin are rare. We encountered a patient with a relatively rare spinal epidural cavernous hemangioma of the thoracic spine that was non-vertebral in origin. The patient was a 63-year-old man. He had become aware of bilateral leg pain and numbness about 2 months earlier, and gait disturbance appeared gradually thereafter. On MRI, a lesion showing iso-intensity on T1-weighted imaging and high intensity on T2-weighted imaging was detected at the 7th thoracic vertebra. On gadolinium contrast-imaging, the lesion was found to be a homogenously-enhanced dumbbell-shaped extradural spinal neoplasm protruding from the left 7th/8th thoracic intervertebral foramen. A neurogenic tumor was suspected based on myelography and MRI findings, and complete tumorectomy was performed, which improved the lower limb symptoms and gait disturbance. The histopathological diagnosis was cavernous hemangioma. Epidural hemangiomas arise from the vertebra in many cases, and pure spinal epidural cavernous hemangiomas are rare. It is difficult to make a preoperative diagnosis because there are no specific imaging findings that can differentiate these tumors. It may be important to consider this disease before surgery in the differential diagnosis of epidural tumors.
Inhibition of gastric perception of mild distention by omeprazole in volunteers
Akihito Iida,Hiroshi Kaneko,Toshihiro Konagaya,Yasushi Funaki
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i39.5576
Abstract: AIM: To evaluate the effects of omeprazole on gastric mechanosensitivity in humans. METHODS: A double lumen polyvinyl tube with a plastic bag was introduced into the stomach of healthy volunteers under fluorography and connected to a barostat device. Subjects were then positioned so they were sitting comfortably, and the minimal distending pressure (MDP) was determined after a 30-min adaptation period. Isobaric distensions were performed in stepwise increments of 2 mmHg (2 min each) starting from the MDP. Subjects were instructed to score feelings at the end of every step using a graphic rating scale: 0, no perception; 1, weak/vague; 2, weak but significant; 3, moderate/vague; 4, moderate but significant; 5, severe discomfort; and 6, unbearable pain. After this first test, subjects received omeprazole (20 mg, after dinner) once daily for 1 wk. A second test was performed on the last day of treatment. RESULTS: No adverse effects were observed. Mean MDP before and after treatment was 6.3 ± 0.3 mmHg and 6.2 ± 0.5 mmHg, respectively. One subject before and 2 after treatment did not reach a score of 6 at the maximum bag volume of 750 mL. After omeprazole, there was a significant increase in the distension pressure required to reach scores of 1 (P = 0.019) and 2 (P = 0.017) as compared to baseline. There were no changes in pressure required to reach the other scores after treatment. Two subjects before and one after omeprazole rated their abdominal feeling < 1 at MDP, and mean (± SE) abdominal discomfort scores at MDP were 0.13 ± 0.09 and 0.04 ± 0.04, respectively. Mean scores induced by each MDP + 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 (mmHg) were 1.1 ± 0.3, 2.0 ± 0.4, 2.9 ± 0.5, 3.3 ± 0.4, 4.6 ± 0.3, 5.2 ± 0.3, 5.5 ± 0.2, 5.5 ± 0.3, 5.7 ± 0.3, and 5.4, respectively. After omeprazole, abdominal feeling scores for the same incremental pressures over MDP were 0.3 ± 0.1, 0.8 ± 0.1, 2.0 ± 0.4, 2.8 ± 0.4, 3.8 ± 0.4, 4.6 ± 0.4, 4.9 ± 0.3, 5.4 ± 0.4, 5.2 ± 0.6, and 5.0 ± 1.0, respectively. A significant decrease in feeling score was observed at intrabag pressures of MDP + 2 mmHg (P = 0.028) and + 4 mmHg (P = 0.013), respectively, after omeprazole. No significant score changes were observed at pressures ≥ MDP + 6 mmHg. CONCLUSION: Although the precise mechanisms are undetermined, the present study demonstrated that omeprazole decreases mechanosensitivity to mild gastric distension.
Endoscopic diagnosis of Barrett’s esophagus
Tomoyuki Akiyama,Yusuke Sekino,Hiroshi Iida,Shigeru Koyama
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i26.3477
Abstract: The Prague C and M Criteria have been developed for the objective endoscopic diagnosis of Barrett’s esophagus (BE). BE arises between the squamocolumnar junction and the gastroesophageal junction at the proximal margin of the gastric folds. In this study, we reported that 43.0% of the subjects examined were diagnosed with BE based on the Prague C and M Criteria. Previous criticism by John Dent proposed that our data should be considered invalid because the prevalence of BE reported in our study was extraordinarily high and discordant with previous studies. Dent predicted that the position of the gastroesophageal junction in our study was judged to be lower than the actual position due to the effacement of the proximal ends of the gastric folds because of the routine use of a high degree of air distension during typical Japanese endoscopic examinations. The endoscopic evaluation of the superior gastric folds is certainly influenced by the degree of air distension of the esophagus. However, in our study, the proximal limit of the gastric mucosal folds was prospectively imaged while the oesophagus was minimally insufflated. Then, under a high level of air distension, the distal ends of the palisade-shaped longitudinal vessels were imaged because they are more easily observed when distended. In the majority of patients, the distal ends of the palisade-shaped longitudinal vessels correspond to the proximal limit of the gastric mucosal folds. Our endoscopic evaluation was appropriately performed according to the Prague C and M Criteria. We suspect that the high prevalence of BE in our study may be due to the inclusion of ultrashort-segment BE, which defines BE with an affected mucosal length under 5 mm, in our positive results.
Rapidly enlarged inflammatory hepatocellular adenoma: A case report  [PDF]
Kenji Koneri, Hidetaka Kurebayashi, Katsuji Sawai, Mitsuhiro Morikawa, Yasuo Hirono, Takanori Goi, Atsushi Iida, Kanji Katayama, Hiroshi Itoh, Motoko Sasaki, Yasuni Nakanuma, Akio Yamaguchi, Makoto Murakami
Open Journal of Gastroenterology (OJGas) , 2013, DOI: 10.4236/ojgas.2013.34038
Abstract: We present a rare case of rapidly enlarging inflamematory hepatocellular adenoma (IHCA) in a 60-year-old Japanese man. Screening abdominal computed tomography (CT) for the fatty liver patient revealed a 1.7-cm liver mass in the anterior segment of the liver. After 19 months, the lesion had rapidly enlarged to 6 cm in diameter and the patient was referred to our hospital. On perflubutane microbubble contrast-enhanced ultrasonography, the tumor showed a characteristic centripetal filling pattern in the vascular phase. We performed hepatic anterior segment resection because we could not rule out malignant tumor. Histopathological examination showed hyperplasia of mildly atypical hepatocytes and sinusoidal dilatation with marked inflammatory cell infiltration. Immunohistological staining revealed positive staining for serum amyloid A and C-reactive protein; therefore, we diagnosed this tumor as IHCA. The patient remains alive 42 months after operation without evidence of recurrence.

Evaluation of Conservative Treatment of Acute Fracture of the Odontoid Process of Axis with a Halo-Vest  [PDF]
Yuichiro Yokoyama, Hiroshi Takahashi, Yasuaki Iida, Yasuhiro Inoue, Keiji Hasegawa, Daisuke Suzuki, Shintaro Tsuge, Wataru Shishikura, Katsunori Fukutake, Ryo Takamatsu, Kazumasa Nakamura, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.37054
Abstract: We fitted a halo-vest on patients with a fracture of the odontoid process of the axis and evaluated the effects of conservative treatment on cervical muscular atrophy and the number and type of patient complaints after bone union. Four patients had Anderson Type II fractures and 6 patients had Type III fractures. Bone union was observed in all patients within 3 months after injury. After halo-vest fitting, cervical muscular atrophy increased with time, however, it gradually improved after removal of the halo-vest. Patients fixed with a halo-vest for more than 10 weeks complained of cervical discomfort and limited range of motion. No patients with fixation for less than 10 weeks had problems in bone union or had cervical complaints. Thus, less than a 10-week fixation period was considered to be appropriate.
Successful Treatment of Spine Fracture for Diffuse Idiopathic Skeletal Hyperostosis with Teriparatide—A Report of Two Cases  [PDF]
Yasuaki Iida, Hiroshi Takahashi, Yuichiro Yokoyama, Yasuhiro Inoue, Daisuke Suzuki, Keiji Hasegawa, Shintaro Tsuge, Wataru Shishikura, Katsunori Fukutake, Ryo Takamatsu, Kazumasa Nakamura, Masayuki Sekiguchi, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.36051
Abstract: We experienced 2 cases of spinal fracture in patients aged 80 years or older with diffuse idiopathic skeletal hyperostosis (DISH). Since they decided not to undergo surgical treatment, we provided conservative treatment with teriparatide. There has been no previous study on teriparatide for spine fracture in DISH. This is the first report of the successful use of teriparatide to treat spine fracture in DISH without surgical intervention. Our patients were treated with teriparatide for 8-9 months after diagnosis of the fracture. Union was obtained in two cases and no adverse events were observed during treatment. Our report showed that teriparatide could be an alternative to conventional intervention in spinal fracture of DISH.
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