Christopher D Roark

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BACKGROUND The frequency and associations of spontaneous hyperventilation in subarachnoid hemorrhage (SAH) are unknown. Because hyperventilation decreases cerebral blood flow, it may exacerbate delayed cerebral ischemia (DCI) and worsen neurological outcome. METHODS This is a retrospective analysis of data from a prospectively collected cohort of SAH(More)
PURPOSE To evaluate the capabilities of MR-guided "prospective stereotaxy" methods for accessing brain structures for biopsy or electrode implantation. MATERIALS AND METHODS MR-guided biopsy and deep brain stimulator (DBS) electrode implantations were performed with a trajectory guide and real-time MR guidance. Imaging methods were used to plan the(More)
Ischemic strokes in childhood are rare. Thrombolytic therapy with intravenous (IV) tissue plasminogen activator (tPA) has been the main intervention for the management of pediatric stroke patients, but safety data are lacking and efficacy has been questioned. Recently, successful endovascular treatments for acute ischemic stroke in children have been(More)
OBJECTIVE Diathermy is contraindicated in patients with implanted deep brain stimulation (DBS) electrodes. As the clinical applications for diathermy and the number of patients with DBS implants continue to grow, the opportunity for diathermy-induced complications in the population with DBS electrodes increases. We report a case of reversible neurological(More)
OBJECTIVE Smoking is a known risk factor for aneurysm development and aneurysmal subarachnoid hemorrhage, as well as subsequent vasospasm in both untreated individuals and patients who have undergone surgical clipping of cerebrovascular aneurysms. However, there is a lack of data in the current scientific literature about the long-term effects that smoking(More)
OBJECTIVE The characteristics, diagnosis, and preferred management strategies for distal posterior inferior cerebellar artery (PICA) aneurysms associated with cerebellar arteriovenous malformation (AVMs) are poorly understood. We present a case series with attention to aneurysm angioarchitecture, diagnostic imaging, treatment approaches, and a thorough(More)
BACKGROUND Stereotactic radiosurgery (SRS) is a treatment option for cerebral arteriovenous malformations (AVMs) to prevent intracranial hemorrhage. The decision to proceed with SRS is usually based on calculated nidal volume. Physicians commonly use the ABC/2 formula, based on digital subtraction angiography (DSA), when counseling patients for SRS. (More)
Macroeconomic exchange rate research has primarily been focused on the consumption correlation puzzle identied by Backus and Smith (1993). This research has largely ignored the dynamic correlations present between exchange rates and other macro variables such as output, and investment. In this paper I build evidence that a relationship may exist between(More)
OBJECTIVE Flow-diverting devices have been used for the treatment of complex intracranial vascular pathology with success, but the role of these devices in treating iatrogenic intracranial vascular injuries has yet to be clearly defined. Here, the authors report their bi-institutional experience with the use of the Pipeline embolization device (PED) for the(More)
Aneurysm rebleeding following initial endovascular management is uncommon, and the factors associated with its occurrence are poorly defined. We retrospectively analyzed a consecutive series of patients presenting with aneurysmal subarachnoid hemorrhage who underwent endovascular management to determine factors associated with rebleeding. Rebleeding(More)