John M. McCormick

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Hydrocephalus was induced in adult greyhounds by intracisternal kaolin. Intraventricular pressure (IVP) was monitored in the conscious animal for 2 weeks using a small implantable sensor, and the time-course of IVP change was characterized. Intraventricular pressure increased significantly within 36 h of kaolin infusion and gradually subsided to normal(More)
The relationship between intracranial and sagittal sinus pressure in normal and kaolin-induced hydrocephalic greyhounds was examined. In normal dogs there was an average 14 mm Hg pressure difference between the ventricles and the sagittal sinus. Elevations of intraventricular pressure were accompanied by small but consistent elevations in sagittal sinus(More)
The efficacy of sodium nitroprusside in resolving cerebral vasospasm was evaluated with multicisternal injections. Twelve animals received fresh, unheparinized arterial blood via three injections (15 ml total) into the cisterna magna. Selective vertebral arteriography was performed on Day 0, and blood injections were performed on the second and third days(More)
Subarachnoid hemorrhage (SAH) causes a spectrum of clinical syndromes from mild discomfort to rapid brain death. The reason for these heterogeneous consequences is poorly understood. A canine autologous shunt model of SAH was used to study this problem. The duration and volume of hemorrhage into the suprasellar cistern at each animal's mean arterial blood(More)
Pharmacological manipulation of cerebral venous blood volume is a theoretical approach to reduce elevated intracranial pressure (ICP). Microapplication of alpha-2 adrenoreceptor agonists has been shown to constrict pial veins selectively. This report explores the physiological effects of the intravenous alpha-2 agonist xylazine in a canine model of raised(More)
A greyhound dog model was used to study the importance of the foramen of Monro as a resistance element to the flow of cerebrospinal fluid (CSF). Normal dogs had no pressure differential discernible despite the infusion of artificial CSF into one lateral ventricle. When CSF was withdrawn from one lateral ventricle, however, 7 of 10 dogs showed(More)
As military tactics evolve toward execution centric operations the ability to analyze vast amounts of mission relevant data is essential to command and control decision making. To maintain operational tempo and achieve information superiority we have developed Vigilant Advisor, a mobile agent-based distributed Plan Execution Monitoring system. It provides(More)
Transformation of military information systems to a network-centric paradigm will remove traditional barriers to interoperability and enable dynamic access to information and analysis resources. The technical challenges of accomplishing network-centric warfare (NCW) require the engineering of agile distributed software components imbued with the ability to(More)
As military tactics evolve toward hyper-tempo operations, the ability to analyze vast amounts of mission relevant data is essential to command-and-control decision-making. Plan Monitoring (PM) systems provide mission status decision support to military commanders by correlating execution observables against an operational plan. The primary challenges faced(More)