Rafael Ortega

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OBJECTIVE The study aimed to describe the prevalence and severity of neuropsychiatric symptoms in patients with Alzheimer's disease (AD) and vascular dementia (VaD). PATIENTS AND METHODS We prospectively studied 65 patients with dementia, 37 met the criteria of NINCDS-ADRDA for probable AD and 28 the clinical and radiological criteria of NINDS-AIREN for(More)
Motivated by the problem of the existence of a solution of the nonlinear telegraph equation wt + clll u,, + h(t. c, u) = 0, such that u(t, ,) satisfies suitable boundary conditions over (0,~) ar;d Ilu(t,.)II is bounded over W for some function space norm 11 11: we prove the existence of bounded solutions over R of semilinear evolution equations in a Hilbert(More)
BACKGROUND Patients with heparin-induced thrombocytopenia II (HIT II) need an alternative nonheparin-based method of anticoagulation for cardiopulmonary bypass (CPB) to prevent thrombosis and thrombosis related complications. METHODS Bivalirudin was used during CPB and deep hypothermic circulatory arrest (DHCA) for resection of multiple right atrial(More)
Let L s L u be a linear differential operator acting on functions u: V a R that are defined on a fixed manifold V. These functions will belong to a Ž . certain family B ; F V, R , and the definition of B may include some boundary conditions or other requirements that must be satisfied by any function u g B. It is said that L satisfies the maximum principle(More)
COMPETITIVE SYSTEMS AND ORBITAL STABILITY IN R RAFAEL ORTEGA AND LUIS ÁNGEL SÁNCHEZ (Communicated by Hal L. Smith) Abstract. Competitive autonomous systems in R3 have the remarkable property of verifying an analogue of the Poincaré-Bendixon theorem for planar equations. This fact allows us to prove the existence of orbitally stable closed orbits for those(More)
Team-based learning is a relatively new educational approach in which learning occurs in three phases. Team-based learning is so named because in the third and final phase, students are organized into teams to participate in a classroom team-based learning session. In the Department of Anesthesiology at Boston University Medical Center, a multi-purpose(More)