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Biomedical subjects

Y Takanashi

Publications and source records attributed to Y Takanashi.

At least 19 recordsLinked to original sources
PubMed2006

Technique and assessment of sentinel lymph node biopsy usefulness in laparoscopy-assisted distal gastrectomy.

BACKGROUND: Recently, some studies have suggested that sentinel node biopsy also can be applied to gastric cancer. The authors apply sentinel lymph node biopsy in laparoscopy assisted distal gastrectomy to perform it as safe limited surgery. Limited surgery is a procedure in which the extent of lesion resection and lymph node dissection is reduced. The authors demonstrate that intraoperative diagnosis of lymph node metastasis is useful in this respect. METHODS: The study was conducted with 38 patients (29 men and 9 women) who had a preoperative diagnosis of T1 tumor invasion. The patients had a mean age of 66.2 years. Patent blue (1%) was injected submucosally into four or five different sites around the primary tumor at 1 ml per site. Blue-stained lymphatics and lymph nodes could be seen by turning over the greater omentum and the lesser omentum extraperitoneally. If blue nodes were found, biopsy was performed. RESULTS: The mean number of blue nodes dissected was 2.5 +/- 1.9. Intraoperative identification and biopsy of blue nodes could be performed for 35 (92.1%) of the 38 patients. Of the 35 patients in whom blue nodes were identified, 4 (9.7%) had metastases in blue nodes confirmed by intraoperative frozen-section diagnosis. Intraoperative frozen-section diagnosis was negative for blue node metastasis in 31 patients. Postoperative permanent section diagnosis also showed no evidence of lymph node metastasis in these 31 patients (100% accuracy, 0% false-negative rates). CONCLUSION: The reported method allows observation of blue-stained lymphatics up to 2 h after patent blue injection. Sentinel node biopsy was performed in laparoscopy assisted distal gastrectomy, making it technically equivalent to open gastrectomy. Sentinel node biopsy can serve as a method to determine the appropriate use of laparoscopy assisted distal gastrectomy for management of T1 gastric cancer.

Aged↗
PubMed2006

[Completion pneumonectomy for pulmonary aspergillosis with hyper immunoglobulin-E syndrome].

A 22-year-old man was admitted to the department of pediatrics of our institute in February 2005, because of pulmonary aspergillosis. He had been diagnosed as hyper immunoglobulin-E syndrome in infancy, and repeated pulmonary infectious desease, such as pulmonary aspergillosis. He received art of right upper lobectomy by pulmonary aspergillosis at the age of 17. In February 2005, he had hemosputum and the chest X-ray showed a giant cavity with niveau in the right lung. In spite of medical treatment by antibiotics and antimycotics, the lesion rapidly increased in size. Therefore, right completion pneumonectomy and omentopexy around the bronchial stump was done. His postoperative course was uneventful.

Adult↗
PubMed2005

Cost-effectiveness of mandibular two-implant overdentures and conventional dentures in the edentulous elderly.

Implementation of new therapies is usually governed by financial considerations, so efficacy studies should also include cost comparisons. The cost and effectiveness of mandibular conventional dentures (CD, n = 30) and two-implant overdentures (IOD, n = 30) were compared in elderly subjects. Effectiveness (Oral Health Impact Profile, OHIP-20) and cost were measured up to one year post-treatment. Data for subsequent years were estimated by the Delphi method. Using an average life expectancy of 17.9 years, the equalized annual costs (in Canadian dollars) were dollar 399 for CD and dollar 625 for IOD (p < 0.001), and the equalized annual values for the outcome (OHIP-20) were 47.0 for CD and 31.3 for IOD treatment (p < 0.05). These values translate into a yearly additional cost for IOD treatment of dollar 14.41 per OHIP-20 point. These results are key to the implementation of programs to provide this form of therapy for edentulous adults.

Aged↗
PubMed2004

Staple line coverage with absorbable mesh after thoracoscopic bullectomy for spontaneous pneumothorax.

BACKGROUND: Thoracoscopic simple bullectomy for primary spontaneous pneumothorax (PSP) has a relatively high postoperative recurrence rate and sometimes results in postoperative air leakage. One of the reasons for postoperative recurrence is the regrowth of bullae around the staple line. Therefore, reinforcement of the visceral pleura around the staple line is a reasonable way to prevent postoperative air leaks and recurrence. This study was done to determine the efficacy in preventing postoperative air leak and recurrent pneumothorax of widely covering the staple line with absorbable mesh after thoracoscopic bullectomy. METHODS: Wide coverage of the staple line with absorbable mesh was performed on 114 patients with PSP. These patients were retrospectively compared with 126 patients who underwent thoracoscopic simple bullectomy alone. RESULTS: The postoperative duration of chest drainage in the coverage group (mean, 1 day; range, 0-5) was significantly shorter than that in the simple bullectomy group (mean, 3 days; range 0-20). A prolonged air leak (>7 days) occurred in six patients in the simple bullectomy group, but there were no such leaks in the coverage group. Recurrent pneumothorax occurred in three patients (2.6%) in the coverage group and 12 patients (9.5%) in the simple bullectomy group. CONCLUSION: Wide coverage of the staple line with absorbable mesh is effective in preventing postoperative air leak and in decreasing the recurrence rates of PSP.

Adolescent↗
PubMed2002

Penetrating brain injury with nasal entry by a plastic stick. Case report.

A case of a 52-year-old male presented with an unusual penetrating brain injury with nasal entry. At admission he had erythema of periorbital soft tissue in the left eye and epistaxis. His neurological condition was lethargic (Glasgow Coma Scale of 13) with nonfluent aphasia. Computed tomography scan revealed intracranial contusion hematoma in the left frontal lobe and fracture of the left frontal base, which were treated surgically. At the 6-month follow-up he still showed nonfluent aphasia. Disturbances, mostly cognitive, were noted on his psychological tests. A survey of the literature reveals a few cases of this nature in penetrating brain injury with nasal entry. A penetrating brain injury with nasal entry which causes nonfluent aphasia is discussing.

Aphasia↗
PubMed2001

Reoperative coronary artery bypass grafting via a left thoracotomy and a small laparotomy without cardiopulmonary bypass: report of a case.

A 66-year-old woman with aortic stenosis underwent an aortic root replacement with a composite graft and coronary artery reconstruction 2 years before presentation. On coronary angiography performed 2 years after operation, saphenous vein graft (SVG) to right coronary artery and SVG to first diagonal branch had both become totally occluded. SVG to left anterior descending artery showed 75% stenosis on the heel side of the distal anastomosis. The patient underwent a second coronary artery bypass via a left thoracotomy (the left internal thoracic artery was anastomosed to the first diagonal branch by interposing it with the left radial artery) and a small laparotomy (the right gastroepiploic artery was anastomosed to the right coronary artery) without a cardiopulmonary bypass. This approach is preferable to avoiding both a resternotomy and cardiopulmonary bypass in patients requiring repeat surgery.

Aged↗
PubMed2001

Plasma concentration of tissue inhibitor of matrix metalloproteinase 1 in patients with colorectal carcinoma.

BACKGROUND: The expression of tissue inhibitor of matrix metalloproteinase (TIMP) 1 in tumour tissue from patients with colorectal carcinoma has been reported to be related to disease progression. However, the clinical significance of plasma TIMP-1 has not been fully elucidated. METHODS: The plasma level of TIMP-1 protein was determined by enzyme-linked immunosorbent assay in samples from 54 patients who underwent resection of the primary tumour. RESULTS: Plasma TIMP-1 levels were associated significantly with depth of invasion and metastasis to lymph nodes and liver. Circulating TIMP-1 levels were significantly higher in patients with serosal invasion, liver metastases and Dukes' stage C tumours. Using a cut-off value of 160 ng/ml, serosal invasion and Dukes' C stage could be predicted with an accuracy of 68.5 per cent. With a cut-off value of 170 ng/ml, metastasis to the lymph node and liver could be predicted with an accuracy of 66.7 and 70.4 per cent respectively. These values were greater than those for carcinoembryonic antigen and CA19-9. CONCLUSION: These data suggest that the plasma concentration of TIMP-1 correlates with both invasion and metastasis in patients with colorectal carcinoma.

Adult↗
PubMed2001

Clinical long-term results of vascular prosthesis sealed with fragmented autologous adipose tissue.

Tissue engineering can improve the former limitations of artificial organs. This article reports the long-term clinical results of grafts constructed with fragmented autologous adipose tissue. We did a retrospective analysis of a series of 53 patients with lower leg ischemia that received 69 fragmented adipose tissue (FAT) grafts implantation at our institution. The mean follow-up period was 36.0 months. After 1, 2, 3, and 5 years, the primary potency rates were 85.3, 83.3, 73.8, and 67.7%, respectively. The lumen of occluded areas not only at anastomotic sites but also in areas far from the anastomotic sites was occupied by a thickened neointima, which had a great number of capillary blood vessels, elastic laminae, smooth muscle cells, fibroblasts, and collagen fibers. This type of intimal hyperplasia was a characteristic finding in the FAT grafts. From the results of this clinical trial, we conclude that the FAT grafts are acceptable as vascular prostheses for ischemic lower extremities. The intimal hyperplasia at sites far from the anastomotic lines suggested the possibility of neointima formation throughout the luminal surface of the grafts.

Adipose Tissue↗
PubMed2001

Midterm results of stent-graft repair for thoracic aortic aneurysms: computed tomographic evaluation.

Midterm observation of endovascular surgery using a fabric-covered stent graft for thoracic aortic aneurysms is discussed with postoperative follow-up findings based on regularly performed thoracic computed tomography (CT). From 1996 to 1999, 20 patients with thoracic aortic aneurysm underwent stent-graft placement in our hospital. One year follow-up CT results after placement were obtained for 17 patients. The CT scans found that there were both thrombosis and size reduction of aneurysm in 8 patients (46%), thrombosis without size reduction in 2 (13%), a new ulcerlike projection (ULP) in 3 (19%), persistent minor endoleakage in 2 (13%), a new endoleak in 1 (6%), and a recurrent endoleak from intercostal arteries in 1 (6%). The new ULP formation seemed to be a peculiar problem stemming from an intimal injury caused by edges of the stent. Therefore, we recently adopted a new spiral stent instead of the previous stent to avoid the injury. The new endoleak suggested that aneurysmal thrombosis without size reduction could cause the aneurysm to develop recurrent endoleaks. From these findings, we concluded that midterm observation of stent-graft repair for thoracic aortic aneurysms did not give satisfactory results. In order to improve the results of endovascular surgery using stent-grafts, we need to develop safer stent grafts with a reliable design to prevent endoleaks and to avoid intimal injury of the aorta. We also hope to develop effective technologies that can accelerate organization of thrombus in the aortic aneurysm after stent-graft placement.

Adult↗
PubMed2001

Magnetic resonance imaging for surgical consideration of acute head injury.

The authors studied the extravasation of contrast enhancement on magnetic resonance (MR) imaging within 6 hours after head injury in 10 patients with 12 intracranial haemorrhagic lesions. The decision for surgical intervention was made by neurological examination, computed tomographic scan, and contrast extravasation on MR imaging. Nine of 10 patients showed extravasation of contrast agent and one patient showed equivocal findings of contrast extravasation. All intracranial lesions with contrast extrav asation led to enlargement in size. With the exception of 1 patient who showed equivocal findings of contrast extravasation, 9 patients needed surgical evacuation of the haemorrhagic lesions. The results of the current study imply that extravasation of contrast medium indicates persistence of post-traumatic bleeding. MR imaging with gadolinium enhancement in acutely head injured patients may be used to predict the development of haemorrhagic lesions and could be helpful in decision making for surgical intervention.

Acute Disease↗
PubMed2001

Intrathecal application with liposome-entrapped Fasudil for cerebral vasospasm following subarachnoid hemorrhage in rats.

To date, the pharmacological approach to cerebral vasospasm following subarachnoid hemorrhage has been hampered in part by an inability to attain sufficiently high concentrations of vasodilator drugs in the cerebrospinal fluid (CSF). To overcome this limitation of current drug therapy, we have developed a sustained-release preparation of protein kinase inhibitor Fasudil. Cerebral vasospasm in rats was induced by double-injection method. Treated rats received 0.417 mg liposome-entrapped Fasudil via the cisterna magna and control rats received drug-free liposomes in the same manner. The diameter of the basilar artery was assessed at 7 days after the initial blood injection. Vasoconstriction of the rat basilar artery was significantly reduced in group treated with liposomal Fasudil compared to the control group (treated group: 87.7 +/- 6.18%, n= 10; control group: 66.3 +/- 9.82%, n = 10; ***P< 0.001). This new approach for cerebral vasospasm may have significant potential for use in the clinical setting.

1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine↗
PubMed2001

Efficacy of intrathecal liposomal fasudil for experimental cerebral vasospasm after subarachnoid hemorrhage.

OBJECTIVE: To investigate the safety and efficacy of liposomal fasudil in a sustained-release form for the prevention of cerebral vasospasm after subarachnoid hemorrhage (SAH). METHODS: Eighteen rats were divided into three groups, each of which received 2.5 mg/kg of liposomal fasudil, 5 mg/kg of liposomal fasudil, or drug-free liposomes after SAH. Next, experimental SAH was induced in 15 dogs by injection of autologous arterial blood into the cisterna magna twice after baseline vertebral angiography. In six dogs, 0.94 mg/kg of liposomal fasudil was injected into the cisterna magna (treatment group). In four dogs, drug-free liposomes were similarly injected (placebo group), and the remaining five dogs were not treated with liposomal injection after SAH (control group). Angiography was repeated on Day 7, and cerebrospinal fluid was collected before the dogs were killed. RESULTS: A high dose of liposomal fasudil caused no significant changes in mean arterial blood pressure and did not induce seizures during the observation period. Gross and microscopic examination of the brains revealed no abnormalities, but severe vasospasm was noted in the rat basilar artery, mainly in the group treated with drug-free liposomes. Likewise, in the canine placebo and control groups, significant vasospasm occurred in the basilar artery on Day 7. In the treatment group, vasospasm in the basilar artery was significantly ameliorated (P < 0.01). In vivo, 90% of fasudil was released from liposomes in the cerebrospinal fluid. CONCLUSION: A single injection of intrathecal liposomal fasudil is safe and effective for the prevention of vasospasm in experimental SAH.

1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine↗
PubMed2001

Neuroprotection by intrathecal application of liposome-entrapped fasudil in a rat model of ischemia.

Pharmacological treatment for cerebral ischemia cannot attain sufficiently high concentrations of the drugs in the cerebrospinal fluid (CSF) without precipitating systemic side effects. The objective of this study is the development of a liposomal drug delivery system that maintains effective concentrations of protein kinase inhibitors fasudil in the CSF, resulting in neuroprotection against cerebral ischemia. Focal cerebral ischemia in rats was induced by middle cerebral artery occlusion using an intraluminal suture technique. Treated rats received 0.25 mg liposome-entrapped fasudil via the cisterna magna 2 hours after ischemic insult. Control rats received drug-free liposomes. Neurological condition and the infarct size were assessed at 24 and 72 hours after ischemia. The concentration of liposome-entrapped fasudil in the CSF was measured before sacrifice. Treated animals showed significantly improved neurological outcomes after the 24-hour observation period compared to the control group (p < 0.001). Treatment with 0.25 mg liposomal fasudil resulted in a reduction in the infarct area (24 hours: 29.0 +/- 4.4%, 72 hours: 28.1 +/- 3.9% of total brain slices) compared to controls (49.6 +/- 4.6%, p < 0.001), but there was no statistical difference between 24 and 72 hours. At 24 hours post-administration, CSF concentrations of liposome-entrapped fasudil were 45.4 +/- 31.5 micrograms/ml (20% of the injected dose). A single intrathecal injection of liposomal fasudil can maintain a therapeutic drug concentration in the CSF over a period of time, significantly decreasing infarct size in a rat model of acute ischemia.

1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine↗
PubMed2001

[Relationship between hyperglycemia following head injury and neurological outcome].

Severe head injury is associated with a stress response that includes hyperglycemia, which has been shown in both experimental and clinical studies to exacerbate the severity of brain injury during ischemic conditions. To define the relationship between serum glucose levels and the outcome of patients suffering from closed head injury, we retrospectively reviewed the clinical courses of 88 consecutive head-injured patients. The patients were divided into two groups according to their GCS score on admission: severely head-injured group (GCS score of 8 or less) in 36 patients; moderately head-injured group (GCS score of 9 to 12) in 52 patients. Severely head-injured group had significantly higher serum glucose levels than moderately head-injured group (mean +/- standard error of the mean; 201 +/- 4.6 mg/dl vs. 171.4 +/- 3.8 mg/dl) (p < 0.01). Patients who subsequently resulted in severe disability, vegetative state, or death had significantly higher serum glucose levels than patients who had good recovery or moderate disability (204.9 +/- 5.9 mg/dl vs. 162.9 +/- 5.1 mg/dl) (p < 0.01). Cases with a fatal clinical course were mostly associated with high glucose levels. All patients who showed a serum glucose level greater than 240 mg/dl on admission were dead. These data suggest that the hyperglycemia on admission is a frequent component of the stress response to head injury, a significant indicator of severity of injury and a potent predictor of the outcome from head injury.

Adolescent↗
PubMed2001

Corrected transposition of the great arteries diagnosed in an 84-year-old woman.

Corrected transposition of the great arteries without associated cardiac anomalies is a rare cardiac malformation. Few patients with this anomaly survive beyond 50 years of age because of systemic ventricular dysfunction or development of AV valvular regurgitation or conduction disturbance. We describe an autopsied, uncomplicated corrected transposition of the great arteries case in which the patient died at 84 years of age. We believe this patient to be the longest surviving corrected transposition of the great arteries associated person in the world.

Aged↗
PubMed2001

Case report: endovascular repair of a thoracic aortic aneurysm (saccular type) with a stent-graft.

We describe the repair of a descending thoracic aortic aneurysm (saccular type, maximal size 85 mm) with an endovascular stent-graft in a 69-year-old man with chronic renal failure. The graft consisted of a self-expanding Z-stent covered with a woven polyester graft. An angiogram obtained intraoperatively showed complete thrombosis of the aneurysm. One month after the procedure, a contrast-enhanced computed tomographic (CT) scan showed thrombosis of the aneurysmal sac. A follow-up CT scan obtained 18 months after operation confirmed that the aneurysm had disappeared.

Aged↗