Atsuhiro Nakagawa

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Traumatic brain injury caused by explosive or blast events is traditionally divided into four phases: primary, secondary, tertiary, and quaternary blast injury. These phases of blast-induced traumatic brain injury (bTBI) are biomechanically distinct and can be modeled in both in vivo and in vitro systems. The primary bTBI injury phase represents the(More)
BACKGROUND In blast wave injury and high-energy traumatic brain injury, shock waves (SW) play an important role along with cavitation phenomena. However, due to lack of reliable and reproducible technical approaches, extensive study of this type of injury has not yet been reported. The present study aims to develop reliable SW-induced brain injury model by(More)
OBJECT Circulating blood volume (cBV) is reported to decrease in patients who suffer a subarachnoid hemorrhage (SAH), but little is known about the correlation between changes in cBV, and patient clinical condition and time course after SAH, especially during the very acute stage. To determine appropriate management of patients with SAH, the authors(More)
OBJECT The "wearing-off" phenomenon often hampers the treatment of Parkinson disease (PD). Although deep brain stimulation (DBS) of the subthalamic nucleus (STN) is known to ameliorate the wearing-off phenomenon, the mechanism by which it does this remains unclear. As part of an inquiry into the mechanism of STN DBS, the authors measured synaptic dopamine(More)
OBJECT Shock waves have been experimentally applied to various neurosurgical treatments including fragmentation of cerebral emboli, perforation of cyst walls or tissue, and delivery of drugs into cells. Nevertheless, the application of shock waves to clinical neurosurgery remains challenging because the threshold for shock wave-induced brain injury has not(More)
OBJECT Surgical revascularization for moyamoya disease prevents cerebral ischemic attacks by improving cerebral blood flow (CBF). Symptomatic cerebral hyperperfusion is a potential complication of this procedure, but its treatment is contradictory to that for ischemia. Because intraoperative techniques to detect hyperperfusion are still lacking, the authors(More)
OBJECTIVE To monitor patency of the bypass and to accomplish comprehensive visualized evaluation of brain surface hemodynamics in childhood moyamoya patients, we performed intraoperative monitoring using novel infrared imaging system. MATERIALS AND METHODS Intraoperative monitoring of brain surface blood flow by IRIS V infrared imaging system has been(More)
Of 250 patients admitted with aneurysmal subarachnoid hemorrhage (SAH) from 1994 to 2000, 16 had massive intra-sylvian hematomas. To predict the useful determinants of the clinical outcome for such patients we analyzed our last 16 cases. The study was performed in 2 parts. Part 1 covered the period from 1994 to 1996 and included 5 patients who underwent(More)
Intraventricular hemorrhage (IVH) on initial computed tomography (CT) was reported to predict lesions of diffuse axonal injury (DAI) in the corpus callosum (CC) on subsequent magnetic resonance imaging (MRI). We aimed to examine the relationship between initial CT findings and DAI lesions detected on MRI as well as the relationship between the severity of(More)
BACKGROUND The transsphenoidal approach has recently been used to treat complex lesions beyond the sella turcica, but the difficulties of dealing with small vessels, deep and narrow space, and working angle may limit the procedures. To overcome these problems, we have developed a pulsed laser-induced liquid jet (LILJ) system to dissect tumor tissue with(More)