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The paper on the UNOS Liver Allocation Model (ULAM) describes the building of a simulation model that supports policy evaluation for a national medical problem. The modeling and simulation techniques used in building ULAM include: fitting donor and patient arrival processes having trend and cyclic rate components using non-homogeneous Poisson processes(More)
The effects of graded hemorrhagic hypotension on electrocortical function was investigated in 12 cats anesthetized with alpha-chloralose. Cerebral function was assessed both in terms of spontaneous activity (EEG) and the somatosensory evoked response. No significant changes in the EEG trace or in the amplitude of the positive/negative waves of the primary(More)
The effects of stimulation and blockade of dopaminergic receptors on cerebral blood flow and metabolism were investigated in 15 anesthetized baboons. The intravenous administration of apomorphine resulted in immediate, dose-dependent increases in cerebral blood flow (increased by 58% following 0.1 mg/kg apomorphine) which were always accompanied by(More)
The UNOS Liver Allocation Model (ULAM) is a simulation of the cadaveric liver allocation system in the United States. ULAM was created by the United Network for Organ Sharing (UNOS) in collaboration with Pritsker Corporation/Symix Systems, to permit comparison of multiple liver allocation policy proposals so that policies can be tested prior to(More)
We examined responses of pial arteries and veins in situ to noradrenergic stimuli in the presence of histamine. Electrical stimulation of sympathetic nerves and perivascular microapplication of norepinephrine in mock cerebrospinal fluid produced constriction of arteries and veins in anesthetized cats. During simultaneous perivascular injection of histamine,(More)
The prodromal (cerebral) symptoms of migraine are associated with a fall in cerebral blood-flow (C.B.F.). The suggestion that various circulating vasoactive agents might be the cause of this fall in C.B.F. ignores the contradictory findings that the cerebral vascular bed is normally unresponsive to such agents; but if the blood-barrier is disrupted,(More)
Substances with varying structural components have been shown to have 5-hydroxytryptamine (5-HT)-like properties in the CNS. In this study, putative 5-HT agonists with indoleamine moeities--lysergic acid diethylamide (LSD) and 5-methoxy-N,N-dimethyltryptamine (5-MeODMT)--and with piperazine moieties--quipazine (Quip) and 6-chloro-2-(1-piperazinyl)pyrazine(More)