In the control group, after the surgical intervention and 30 minutes after the patient's extubation the CAM-ICU scale is administered, recording its value as R0. The following day, at 9:00 a.m., another nurse uses the CAM-ICU scale, noting its value as R1. If postoperative delirium was detected during the day and night, the unit's usual treatment was followed: administration of haloperidol and/or dexmedetomidine.

In the intervention group, patients and/or companions are asked to provide visual material, which could consist of photographs of loved ones and/or places known to the patient. 30 minutes after the extubation of the patients, the CAM-ICU scale is administered, recording its value as R0. At night, the projection of images provided by the patient are replaced by a nocturnal visual projection (night sky with stars and moon), ensuring that the patient is able to identify that it was nighttime. Finally, at 9:00 a.m., a nurse who had not worked at night and therefore did not know which patients had received the intervention, administers the CAM-ICU scale again, recording its value as R1.

Patients are randomized into two groups (control group and intervention group). Initially, all patients are administered the "Mini-Mental State Examination scale" (MMSE) to assess their initial cognitive state and their sociodemographic and anthropometric data.

In the intervention group, patients and/or companions are asked to provide visual material, which could consist of photographs of loved ones and/or places known to the patient. 30 minutes after the extubation of the patients, the CAM-ICU scale is administered.

In the control group, after the surgical intervention and 30 minutes after the patient's extubation the CAM-ICU scale is administered.

Changes in the scale for the diagnosis of delirium in critical care units were assessed previous and post intervention of visual material projection.

The final CAM-ICU-7 score ranges from 0-7 with 7 being most severe. CAM-ICU-7 scores were further categorized as 0-2: no delirium, 3-5: mild to moderate delirium, and 6-7: severe delirium.

Initially, regardless of the group to which they belonged, all patients were administered the MMSE scale to assess their initial cognitive state and their sociodemographic and anthropometric data were collected.

The maximum score for the MMSE is 30. A score of 25 or higher is classed as normal. If the score is below 24, the result is usually considered to be abnormal, indicating possible cognitive impairment.