دسته بندی : پاورپوینت نوع فایل: ppt _ pptx ( قابلیت ویرایش ) قسمتی از اسلاید پاورپوینت : تعداد اسلاید : 49 صفحه Brain Pacemaker What’s Parkinson? Parkinson’s disease is caused by loss of a chemical in the brain called dopamine. Parkinsonian tremor appears to be caused by a population of neurons located in the thalamus and the basal ganglia.These neurons fire in a synchronized and intrinsically periodical manner at a frequency similar to that of the tremor, regardless of any feedback signals.Four Typical Symptoms Tremor (involuntary rhythmic shaking) Rigidity (stiffness of the limbs), Bradykinesia / Akinesia (slowness of movement / no movement) Postural instability (problems with balance or coordination) What Does DBS Do? Electrical deep brain stimulation (DBS)is performed by administering a permanent high-frequency (HF)(>100 Hz) periodic pulse train via the depth electrodes.A patient before su …
