Computing and visualizing informative trajectories in temporaly annotated data

2n premi en la 3a edició dels Big Data Talent AwardsA trajectory in the medical world, is the sequence of events that occur during the life of a patient. In the recent years, these trajectories have been stored in the Electronical Health Records and many of the health organizations have databases with the clinical history of all their patients. The trajectories can be summarized in a trajectory graph which shows the different paths the trajectory of a patient may take. The graph contains events on its nodes and the edges contain the temporal relations. Previous works focused in the exploration of trajectory graphs only allow one event at each node, thus losing information and potentially mixing different groups of patients. In this work, we have developed a new procedure to extract the trajectory graphs that allows having several events in a single node of the graph. This procedure has been tested in two real world datasets: one related to diagnostics at hospital admissions, and the other on prescriptions in intensive care units.Award-winnin

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

Meeting abstrac

Computing and visualizing informative trajectories in temporaly annotated data

2n premi en la 3a edició dels Big Data Talent AwardsA trajectory in the medical world, is the sequence of events that occur during the life of a patient. In the recent years, these trajectories have been stored in the Electronical Health Records and many of the health organizations have databases with the clinical history of all their patients. The trajectories can be summarized in a trajectory graph which shows the different paths the trajectory of a patient may take. The graph contains events on its nodes and the edges contain the temporal relations. Previous works focused in the exploration of trajectory graphs only allow one event at each node, thus losing information and potentially mixing different groups of patients. In this work, we have developed a new procedure to extract the trajectory graphs that allows having several events in a single node of the graph. This procedure has been tested in two real world datasets: one related to diagnostics at hospital admissions, and the other on prescriptions in intensive care units.Award-winnin

Combined effects of hydrologic alteration and cyprinid fish in mediating biogeochemical processes in a Mediterranean stream

Este artículo contiene 9 páginas, 6 figuras, 3 tablas.Flow regimes are important drivers of both stream community and biogeochemical processes. However, the interplay between community and biogeochemical responses under different flow regimes in streams is less understood. In this study, we investigated the structural and functional responses of periphyton and macroinvertebrates to different densities of the Mediterranean barbel (Barbus meridionalis, Cyprinidae) in two stream reaches differing in flow regime. The study was conducted in Llémena Stream, a small calcareous Mediterranean streamwith high nutrient levels.Weselected a reachwith permanent flow(permanent reach) and another subjected to flowregulation (regulated reach)with periods of flowintermittency. At each reach,we used in situ cages to generate 3 levels of fish density. Cages with 10 barbels were used to simulate high fish density (N7 indm−2); cages with open sides were used as controls (i.e. exposed to actual fish densities of each stream reach) thus having low fish density; and those with no fish were used to simulate the disappearance of fish that occurs with stream drying. Differences in fish density did not cause significant changes in periphyton biomass and macroinvertebrate density. However, phosphate uptake by periphyton was enhanced in treatments lacking fish in the regulated reachwith intermittent flow but not in the permanent reach, suggesting that hydrologic alteration hampers the ability of biotic communities to compensate for the absence of fish. This study indicates that fish density canmediate the effects of anthropogenic alterations such as flowintermittence derived from hydrologic regulation on stream benthic communities and associated biogeochemical processes, at least in eutrophic streams.This research was supported by the Spanish Ministry of Economy and Competitiveness (projects CGL2013-43822-R and CGL2016- 80820-R); the Government of Catalonia (ref. 2014 SGR 484 and CERCA Programme) and the University of Girona (ref.MPCUdG2016/120). David Almeida benefitted from a postdoctoral fellowship from the Generalitat de Catalunya (2013 BP_B00172) and Baigal-Amar Tuulaikhuu benefited from a doctoral fellowship from the European Commission (Erasmus Mundus Partnership “Techno II”, 372228-1- 2012-1-FR-ERA MUNDUS-EMA21).Peer reviewe