ObjectiveTo analyse the incident communicated through a notification system and register in a critical care unit. MethodologyA cross-sectional descriptive study was conducted by performing an analysis of the records of incidents communicated anonymously and voluntarily from January 2007 to December 2013 in a critical care unit of adult patients with severe trauma. Study variables: incident type and class, professional reports, and suggestions for improvement measures. A descriptive analysis was performed on the variables. ResultsOut of a total of 275 incidents reported, 58.5% of them were adverse events. Incident distributed by classes: medication, 33.7%; vascular access-drainage-catheter-sensor, 19.6%; devices-equipment, 13.3%, procedures, 11.5%; airway tract and mechanical ventilation, 10%; nursing care, 4.1%; inter-professional communication, 3%; diagnostic test, 3%; patient identification, 1.1%, and transfusion 0.7%. In the medication group, administrative errors accounted for a total of 62%; in vascular access-drainage-catheter-sensor group, central venous lines, a total of 27%; in devices and equipment group, respirators, a total of 46.9%; in airway self-extubations, a total of 32.1%. As regards to medication errors, 62% were incidents without damage. Incident notification by profession: doctors, 43%, residents, 5.6%, nurses, 51%, and technical assistants, 0.4%. ConclusionsAdverse events are the most communicated incidents. The events related to medication administration are the most frequent, although most of them were without damage. Nurses and doctors communicate the incidents with the same frequency. In order to highlight the low incident notification despite it being an anonymous and volunteer system, therefore, it is suggested to study measurements to increase the level of communication.