In Zaragoza, he is part of the research group in Biomedical Signal Interpretation and Computational Simulation, as well as Centro de Investigacíon Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN). His research interests include biomedical signal processing, with focus on cardiovascular signals. The reason for his visit is a project concerning the development of novel techniques for cardiac signal extraction during hemodialysis. Dr. Martínez' stay is financed by a grant from Crafoordska stiftelsen.