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Download Deep brain stimulation: indications and applications by Kendall H. Lee, Penelope S. Duffy, Allan J. Bieber PDF

By Kendall H. Lee, Penelope S. Duffy, Allan J. Bieber

Deep mind stimulation (DBS) is a everyday treatment for circulate issues resembling Parkinson's disorder, crucial tremor, and dystonia. Its healing luck has resulted in the applying of DBS for an expanding spectrum of stipulations. despite the fact that, the basic relationships among neural activation, neurochemical transmission, and medical results in the course of DBS are usually not good understood.

Drawing at the medical and examine services of the Mayo hospital Neural Engineering Laboratories, this e-book addresses the background of healing electric stimulation of the mind, its present program and results, and theories approximately its underlying mechanisms. It experiences learn on measures of neighborhood stimulation–evoked neurochemical liberate, imaging examine on stimulation-induced neural circuitry activation, and the state-of-the-art on closed-loop suggestions units for stimulation delivery.

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Extra info for Deep brain stimulation: indications and applications

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8). 8 Charge density versus charge per phase showing regions of safe and unsafe tissue stimulation. The parameter k defines the boundary between safe (upper right region) stimulation parameters and those that result in tissue damage (bottom left region). Several studies found that histological damage increases proportionally with charge density at the electrode tip [71, 76]. The safe charge density threshold will vary according to the type of electrode, its metal composition, the stimulation waveform, and the location of the electrode within the body [27, 68, 70–72, 77].

This phenomenon is known as the mass-action theory of neuronal damage [35, 73]. Charge Density and Charge Per Phase Safe chronic electrical stimulation of neural tissue requires not only application of charge-balanced stimulation waveforms, but also analysis of charge density and charge per phase values [71]. The Electrode/Electrolyte Tissue Interface charge density (in μC/cm2) is the amount of electric charge Q in a surface or volume: Q = IxPW/A, log(CD) = k – log(Q) where I represents the current intensity, PW the pulse width, and A the electrode surface area.

Then in 1889, Demitri Zernov, a Russian anatomist at Moscow University, developed a rudimentary frame instrument called the “encephalometer,” using polar coordinates and an arc-based guiding mechanism to guide a probe to a specific brain location [53]. The apparatus was used on at least three occasions in human surgery, mainly in surface topography for localization of the cranial sutures and cerebral sulci. In 1903 physician and neurosurgeon Victor Horsley (1857– 1916) and surgeon, physiologist, and long-term collaborator Robert Clarke (1850–1926) introduced a new apparatus that used the Cartesian coordinate system and cranial landmarks to allow them to introduce lesions at specific locations within the cerebellum of monkeys with quasi-mathematical precision.

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