Angel Pérez de Madrid

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OBJECTIVES The present study examined whether angina 48 h before myocardial infarction provides protection in adult and elderly patients. BACKGROUND The mortality rate for coronary artery disease is greater in elderly than in young patients. In experimental studies, ischemic preconditioning affords an endogenous form of protection against(More)
OBJECTIVE We evaluated the effect of two calcium channel blockers, verapamil and felodipine, on heart rate variability in hypertensive patients. DESIGN Time and frequency domain measures of heart rate variability were obtained from 24 h Holter recording in 25 previously untreated hypertensive patients without left ventricular hypertrophy, before and after(More)
This work focuses on a new type of cost function based on fractional operators. To do so, the concept of definite integral is extended to arbitrary real-order. Some properties of this new fractional-order definite integral are studied and a fractional-order Barrow’s rule is proposed. It is illustrated by an example (the design of an IIR filter) how this new(More)
This paper deals with the formal formulation of Fractional-Order Generalized Predictive Control, a generalization of GPC that makes use of fractional-order operators in its cost function. A thorough mathematical description of FGPC is given and the main similarities and differences between GPC and FGPC are highlighted.
INTRODUCTION AND OBJECTIVES The effect of cardiac resynchronization therapy on antitachycardia pacing still has to be determined. PATIENTS AND METHOD A total of 490 heart failure patients with an indication for an implantable cardioverter-defibrillator participated in the VENTAK CHF/CONTAK CD study, a single-blind, randomized, placebo-controlled study. We(More)
This work describes the fractional generalization of GPC, known as Fractional–Order Generalized Predictive Control (FGPC). Based on a real−order fractional cost function, FGPC combines valuable characteristics of fractional calculus and predictive control. The mathematical fundamentals of FGPC as well as a possible tuning algorithm are reviewed. We also(More)
INTRODUCTION The characteristics of restenosis and remodeling after carotid percutaneous transluminal angioplasty (PTA) were badly known. OBJECTIVE To describe these characteristics in our series of carotid PTA. PATIENTS AND METHODS A total of 78 cases of PTA for symptomatic > 70% atherosclerotic stenosis of the extracranial internal carotid artery,(More)