WILLIAM OMAR CONTRERAS LOPEZ

(Fonte: Lattes)
Índice h a partir de 2011
8
Lattes
Projetos de Pesquisa
Unidades Organizacionais

Filtros

Limpar filtros

Configurações

Autor: FONOFF, Erich Talamoni × search.filters.applied.f.dateIssued: 2016 ×

Resultados de Busca

Agora exibindo 1 - 3 de 3
  • article 8 Citação(ões) na Scopus
    Microendoscopy-guided percutaneous cordotomy for intractable pain: case series of 24 patients
    (2016) FONOFF, Erich Talamoni; LOPEZ, William Omar Contreras; OLIVEIRA, Ywzhe Sifuentes Almeida de; TEIXEIRA, Manoel Jacobsen
    OBJECTIVE The aim of this study was to show that microendoscopic guidance using a double-channel technique could be safely applied during percutaneous cordotomy and provides clear real-time visualization of the spinal cord and surrounding structures during the entire procedure. METHODS Twenty-four adult patients with intractable cancer pain were treated by microendoscopic-guided percutaneous radiofrequency (RF) cordotomy using the double -channel technique under local anesthesia. A percutaneous lateral puncture was performed initially under fluoroscopy guidance to localize the target. When the subarachnoid space was reached by the guiding cannula, the endoscope was inserted for visualization of the spinal cord and surrounding structures. After target visualization, a second needle was inserted to guide the RF electrode. Cordotomy was performed by a standard RF method. RESULTS The microendoscopic double -channel approach provided real-time visualization of the target in 91% of the cases. The other 9% of procedures were performed by the single -channel technique. Significant analgesia was achieved in over 90% of the cases. Two patients had transient ataxia that lasted for a few weeks until total recovery. CONCLUSIONS The use of percutaneous microendoscopic cordotomy with the double-channel technique is useful for specific manipulations of the spinal cord. It provides real-time visualization of the RF probe, thereby adding a degree of safety to the procedure.
  • article 5 Citação(ões) na Scopus
    Mystery Case: Brown-Sequard syndrome caused by idiopathic spinal cord herniation
    (2016) FONOFF, Erich Talamoni; LOPEZ, William Omar Contreras; TEIXEIRA, Manoel Jacobsen
    A 48-year-old man developed numbness in the left leg, which progressed gradually to paresis and urinary incontinence. Neurologic examination revealed a left Brown-Sequard syndrome with leg paresis, mild spasticity, reduced proprioception, and contralateral thermal and painful hypoesthesia below T6. MRI revealed a thoracic spinal cord herniation (SCH) (figure). Idiopathic SCH is relatively rare. Pathogenesis involves a dura mater defect (see video on the Neurology (R) Web site at Neurology.org); herniation develops over a progressive pressure gradient through the dural fissure.(2) Surgical reduction is typically performed if symptoms progress, but mild symptoms may be eligible for conservative treatment and monitoring. Surgical spinal reduction and dural repair usually reverses neurologic deficits.
  • article 6 Citação(ões) na Scopus
    Simultaneous bilateral stereotactic procedure for deep brain stimulation implants: a significant step for reducing operation time
    (2016) FONOFF, Erich Talamoni; AZEVEDO, Angelo; ANGELOS, Jairo Silva dos; MARTINEZ, Raquel Chacon Ruiz; NAVARRO, Jessie; REIS, Paul Rodrigo; SEPULVEDA, Miguel Ernesto San Martin; CURY, Rubens Gisbert; GHILARDI, Maria Gabriela dos Santos; TEIXEIRA, Manoel Jacobsen; LOPEZ, William Omar Contreras
    OBJECTIVE Currently, bilateral procedures involve 2 sequential implants in each of the hemispheres. The present report demonstrates the feasibility of simultaneous bilateral procedures during the implantation of deep brain stimulation (DBS) leads. METHODS Fifty-seven patients with movement disorders underwent bilateral DBS implantation in the same study period. The authors compared the time required for the surgical implantation of deep brain electrodes in 2 randomly assigned groups. One group of 28 patients underwent traditional sequential electrode implantation, and the other 29 patients underwent simultaneous bilateral implantation. Clinical outcomes of the patients with Parkinson's disease (PD) who had undergone DBS implantation of the subthalamic nucleus using either of the 2 techniques were compared. RESULTS Overall, a reduction of 38.51% in total operating time for the simultaneous bilateral group (136.4 +/- 20.93 minutes) as compared with that for the traditional consecutive approach (220.3 +/- 27.58 minutes) was observed. Regarding clinical outcomes in the PD patients who underwent subthalamic nucleus DBS implantation, comparing the preoperative off-medication condition with the off-medication/on-stimulation condition 1 year after the surgery in both procedure groups, there was a mean 47.8% +/- 9.5% improvement in the Unified Parkinson's Disease Rating Scale Part III (UPDRS-III) score in the simultaneous group, while the sequential group experienced 47.5% +/- 15.8% improvement (p = 0.96). Moreover, a marked reduction in the levodopa-equivalent dose from preoperatively to postoperatively was similar in these 2 groups. The simultaneous bilateral procedure presented major advantages over the traditional sequential approach, with a shorter total operating time. CONCLUSIONS A simultaneous stereotactic approach significantly reduces the operation time in bilateral DBS procedures, resulting in decreased microrecording time, contributing to the optimization of functional stereotactic procedures.