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Search Results: 1 - 10 of 3525 matches for " stereotaxic techniques "
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Stereotactic surgery in India : the past, present and the future.
Ramamurthi B
Neurology India , 2000,
Abstract: The achievements of Indian neurosurgeons in different fields of stereotactic surgery over the past decades have been discussed. This covers diverse areas like Parkinson′s disease, abnormal movements, cerebral palsy, spasticity, pain relief, and sedative and functional neurosurgery. Recently, technological advances have made stereotactic surgery useful in many fields like deep biopsies, minimally invasive surgery and radiosurgery. Apart from these areas, there is still a big scope for revival of surgery on deep structures of the brain, as was practised earlier. This will lead to newer knowledge about brain function and also give relief to many patients. The future is bright, provided Indian neurosurgeons show a paradigm shift in their thinking and bring out new ideas. Interaction with other scientific disciplines is necessary in the future if new knowledge has to be added or new techniques have to be devised.
Strategies for resection of lesions in the motor area: preliminary results in 42 surgical patients
Sarmento, Stênio Abrantes;Andrade, Emerson Magno F. de;Tedeschi, Helder;
Arquivos de Neuro-Psiquiatria , 2006, DOI: 10.1590/S0004-282X2006000600015
Abstract: in recent years considerable technological advances have been made with the purpose of improving the surgical results in the treatment of eloquent lesions. the overall aim of this study is to evaluate the postoperative surgical outcome in 42 patients who underwent surgery to remove lesions around the motor cortex, in which preoperative planning by using neuroimaging exams, anatomical study, appropriate microsurgery technique and auxiliary methods such as cortical stimulation were performed. twenty-two patients (52.3%) presented a normal motor function in the preoperative period. of these, six developed transitory deficit. twenty patients (47.6%) had a motor deficit preoperatively, nevertheless 90% of these improved postoperatively. surgery in the motor area becomes safer and more effective with preoperative localization exams, anatomical knowledge and appropriate microsurgery technique. cortical stimulation is important because it made possible to maximize the resection reducing the risk of a motor deficit. stereotaxy method was useful in the location of subcortical lesions.
The Efficacy of Specimen Radiography in Clinically Occult Breast Lesions
Demet KARADA?
Trakya Universitesi Tip Fakultesi Dergisi , 2008,
Abstract: Objectives: The aim of this study was to evaluate the efficacy of specimen radiography for clinically occult breast lesions.Patients and Methods: We retrospectively evaluated specimen radiographs of 215 patients (mean age 48.64±8.4 years; range 28 to 75 years) whose lesions were detected by mammography and/or ultrasonography and localized by wire. Preoperative wire localization was performed under the guidance of ultrasonography in 59 cases (27.4%) and stereotactically in 156 cases (72.6%). The findings of specimen radiography were compared with those of histopathologic examination.Results: Specimen radiographs showed lesions in all but three cases. In these three cases, no breast lesions were found in control mammographies.Conclusion: Breast biopsy specimen radiography is a safe method to ensure complete excision of clinically occult breast lesions.
An analysis to compare the effects of stereotactic surgery and conservative medical treatment on hypertensive intracerebral hemorrhage
Wei-dong GUO
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To analyze the therapeutic effects of stereotactic surgery and conservative medical treatment in patients with hypertensive intracerebral hemorrhage.Methods The clinical data of 100 patients with hypertensive intracerebral hemorrhage who underwent stereotactic surgery(stereotactic surgery group) from June 2002 to October 2009 were retrospectively analyzed,and the result was compared with that of 80 contemporaneous patients with hypertensive intracerebral hemorrhage who received conservative medical treatment(medical treatment group).There was no significant difference of bleeding site,bleeding volume and state of consciousness on admission between two groups.Results The mortality rate of stereotactic surgery group was 21.0%,and of medical treatment group was 30.0%.The average hematoma absorption time in stereotactic surgery group was 4.8d,and that of medical treatment group was 15.1d.All of the surviving patients were followed-up for 6 months,the rate of cure and mild disability in stereotactic surgery group(37%) was significantly higher than that of medical treatment group(26%,P < 0.01),the rate of severe disability in stereotactic surgery group(23%) was significantly lower than that of medical treatment group(37%,P < 0.01),while there was no significant difference in the rate of moderate disability between the two groups(40% and 37%,respectively,P > 0.05).Conclusion Compared with conservative medical treatment,stereotactic surgery could decrease the mortality rate and improve the quality of life in patients with hypertensive intracerebral hemorrhage.
Effects of valerian consumption during pregnancy on cortical volume and the levels of zinc and copper in the brain tissue of mouse fetus
Alireza Mahmoudian
Zhong Xi Yi Jie He Xue Bao , 2012,
Abstract:
Acurácia diagnóstica da biópsia percutanea com agulha grossa orientada por estereotaxia nas les?es mamárias categoria BI-RADS? 4
Moutinho, Maria Silvia Petty;Elias, Simone;Kemp, Cláudio;Nazário, Afonso Celso Pinto;Baracat, Edmund Chada;
Revista Brasileira de Ginecologia e Obstetrícia , 2007, DOI: 10.1590/S0100-72032007001200002
Abstract: purpose: to assess the accuracy (rate of correct predictions) of stereotactic core needle biopsy (cnb) of risk category bi-rads? 4 breast lesions. methods: a retrospective analysis of category bi-rads? 4 breast lesions that had been submitted to a stereotactic core-needle biopsy from june 1998 to june 2003. patients with histological benign results consistent with the radiographic image were referred to mammographic follow-up. patients with malign diagnosis and papillary lesions were submitted to standard specific treatment. excisional biopsies were performed when results were benign, but in disagreement with the mammographic image. it was considered as a gold-standard attendance: (1) the mammographic follow-up of low suspicion lesions with benign results at cnb, which stayed unchanged for, at least, three years, and (2) surgical resection when specimen results were malign or benign, but with a high suspicion on mammography. sensitivity (s) specificity (e) and overall accuracy of stereotactic cnb were statistically analyzed. results: among the 118 non-palpable lesions of category bi-rads? 4 submitted to cnb, the results obtained were: 27 malign cases, 81 benign, and ten lesions with atypical or papillary lesions. the statistical analysis comprised 108 patients (atypical and papillary lesions were excluded). cnb sensitivity was 87.1% and specificity 100%. the positive predictive value was 100% and the negative, 95.1%. false negatives occurred in 3.7% (4/108) of cases. the prevalence of malign diagnostics in the bi-rads? 4 lesions of this sample was 29.7 (31/118).the accuracy of this method in this casuistic was 96.3%. conclusions: these results support stereotactic cnb as an extremely reliable alternative to open biopsy, in the diagnosis and definition of breast lesions. in positive results, it is possible to indicate the appropriate therapy, and, in negative (when mammography shows low suspicion), it allows a follow up.
Resección microquirúrgica estereotáxica de tumores intracraneales guiada por imagen y asistida por computadora
López Flores,Gerardo; Guerra Figueredo,Eritk; Ochoa Zaldívar,Luis; Padrón,Arnaldo; Torres,Abel; Morales,Juan Miguel; García Maeso,Iván; Teijeiro Amador,Juan; Fermín,Eduardo; Villegas,Alexei; Estupi?án,Bárbara; Jordán,José;
Revista Cubana de Cirug?-a , 2000,
Abstract: it is reported that spatial guidance during microsurgery is an essential element. this application of stereotaxic surgery is shown at the international center of neurological restoration (ciren, in spanish) from may, 1994, to february, 1998, on describing the performance of 65 microsurgical procedures under stereotaxic conditions among 62 patients with cerebral intracranial tumors. the procedure was divided into 3 stages: image adquisition, cat, surgical planning , with stassis planning system, and microsurgical procedures that included the leksell, micromar and esteroflex stereotaxic systems. 27 of the total of patients presented glial tumors; 33, non-glial; and only 2 non-neoplastic lesions of diverse localization and size. 30 total resections were made. surgical morbidity was minimum and there was no surgical mortality. the main advantages of this method are: exact localization of the craniotomy, easy spatial guidance, and the opportunity to distinguish the limits between the tumor and the sound tissue. the possibility to apply esteroflex to cerebral microsurgery was demonstrated
A stereotaxic method and apparatus for the Gekko gecko
WenBo Wang,ZhenDong Dai,Hua Tan,Ce Guo,JiuRong Sun
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0175-y
Abstract: To study the modulation mechanism of the middle brain of the Gekko to the locomotion, we introduced a stereotaxic method first in literature and developed an apparatus suitable for Gekko gecko, the biggest wall and ceiling climber in nature. We defined the bregma and nasal points as reference points, selected the bilateral infraorbital margin and top point of the maxillary tooth for locating and fixing, and set up the line passing through the bregma and paralleling to a line connecting the bilateral infraorbital margin as x axis. Then, we defined a horizontal plane in the stereotaxic instrument, passing through x axis and the certain point which is 4.8 mm exactly above the nasal point, as the XOY plane; the sagittal plane, i.e. the YOZ plane, is the plane which is perpendicular to x axis and passes through the bregma; the plane, i.e. the XOZ plane, which passes through x axis and is perpendicular to the horizontal plane is the coronal plane. We designed a set of head holder which includes three parts: bilateral infraorbital margin clamps, a gecko adaptor holding the rostral side of the upper jaw. The allocation and operation of the head holder is accurate and simple, and the device is low in cost and compatible with standard stereotaxic instrument.
Resección microquirúrgica estereotáxica de tumores intracraneales guiada por imagen y asistida por computadora
Gerardo López Flores,Eritk Guerra Figueredo,Luis Ochoa Zaldívar,Arnaldo Padrón
Revista Cubana de Cirugía , 2000,
Abstract: Se reporta que la orientación espacial durante la microcirugía, constituye un elemento indispensable. Se demuestra esta aplicación de la cirugía estereotáxica en el Centro Internacional de Restauración Neurológica (CIREN) de mayo de 1994 a febrero de 1998, al describir la realización de 65 intervenciones microquirúrgicas en condiciones estereotáxicas, a 62 pacientes con tumores cerebrales intracraneales. El proceder se dividió en 3 etapas: adquisición de la imagen, tomografía axial computadorizada, planificación quirúrgica, con sistema de planeamiento STASSIS y procederes microquirúrgicos, que incluyeron los sistemas estereotáxicos: Leksell, Micromar y Estereoflex. Del total, 27 de estos pacientes presentaron tumores gliales, 33 no gliales y sólo 2 lesiones no neoplásicas de localización y tama o variados. Se realizaron 30 resecciones totales. La morbilidad quirúrgica fue mínima y no hubo mortalidad quirúrgica. Las principales ventajas del método son: localización exacta de la craneotomía, fácil orientación espacial, facilidad para distinguir los límites entre el tumor y el tejido sano. Se verificó la aplicabilidad del Estereoflex a la microcirugía cerebral It is reported that spatial guidance during microsurgery is an essential element. This application of stereotaxic surgery is shown at the International Center of Neurological Restoration (CIREN, in Spanish) from May, 1994, to February, 1998, on describing the performance of 65 microsurgical procedures under stereotaxic conditions among 62 patients with cerebral intracranial tumors. The procedure was divided into 3 stages: image adquisition, CAT, surgical planning , with STASSIS planning system, and microsurgical procedures that included the Leksell, Micromar and Esteroflex stereotaxic systems. 27 of the total of patients presented glial tumors; 33, non-glial; and only 2 non-neoplastic lesions of diverse localization and size. 30 total resections were made. Surgical morbidity was minimum and there was no surgical mortality. The main advantages of this method are: exact localization of the craniotomy, easy spatial guidance, and the opportunity to distinguish the limits between the tumor and the sound tissue. The possibility to apply Esteroflex to cerebral microsurgery was demonstrated
Modelo experimental de trauma medular agudo produzido por aparelho estereotáxico modificado
Torres, B.B.J.;Silva, C.M.O.;Almeida, á.E.R.F.;Caldeira, F.M.C.;Gomes, M.G.;Alves, E.G.L.;Silva, S.J.;Melo, E.G.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2010, DOI: 10.1590/S0102-09352010000100013
Abstract: fifty-five male rats (rattus novergicus), wistar variety, were used with the purpose of suggesting an experimental model of spinal cord trauma performed by using a modified stereotaxic equipment capable to reproduce clinically (standardized) pattern spinal cord injury. after dorsal laminectomy of t13, a compression was performed with 50.5g (25 animals - group i) or 70.5g (30 animals - group ii) during five minutes on spinal cord. the animals were assisted during eight days by behavioral tests to evaluate painful sensibility, motor capacity, proprioceptive and tactil placing, and stability on inclined plan. in the group i, moderate and transitory neurological deficits were observed, that varied among the animals. in the group ii, a standardized trauma was obtained, characterized by bilateral and symmetrical paraplegia of hindlimbs, loss of proprioception, and painful sensibility in all the animals. the use of developed stereotaxic equipment allowed to reproduce pattern spinal cord injury in rats, by a simply, economic, and satisfactory way. this can provide progresses in the therapeutic investigations embracing neurodegenerative diseases, like spinal cord injury.
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