This study is a pilot randomized controlled trial, comparing a group of older patients with standardized non-pharmacological delirium prevention plus a basic tablet versus a group with standardized non-pharmacological delirium prevention plus a tablet with a software of cognitive stimulation (PREVEDEL).

Software:It is a local development, including a interprofessional team of delirium healthcare experts, older patients and a team og engineers. The software was developed during the first year of this project and was inscribed for author rights.

Inclusion criteria: Older patients > 65 y.o. Admitted to medicine room or intermediate care unit > 48 hrs, and informed consent to participate.

Exclusion Criteria:Delirium positive, neuroleptic use, dementia, and non-spanish speakers.

The study was approved by ethical committee of Hospital Clinico University of Chile Standardized Non-pharmacological intervention: Health workers were previously educated in delirium, and environmental issues were implemented. This intervention coverage in nine different domains: orientation, early mobilization, environmental noise and light, sensorial deficit, sleep, hydratation, drug reduction, and family participation.

Intervention: All patients will have a tablet with or without the software PREVEDEL between 09:00-19:00 hrs.

Measures: delirium will be monitoring with CAM (Confusion Assessment Method) twice a day for 5 days.

Primary outcome: Delirium rate between both groups Secondary outcomes:Long of stay, severity od delirium, time of use of electronic device, and Barthel to discharge.

Inclusion Criteria:

Older patients > 65 y.o. Admitted to medicine room or intermediate care unit > 48 hrs, and informed consent to participate.

Exclusion Criteria:

Delirium positive, neuroleptic use, dementia, and non-spanish speakers.