"Don't know" sign: description and evaluation of its diagnostic accuracy for cognitive impairment.

Objectives: Patients in neurology clinics are sometimes not aware of the reason for the consultation, and we have called this circumstance the "Don't know" sign (DKS). Our objective was to define this new sign and its modalities and to evaluate its prevalence and its diagnostic accuracy for cognitive impairment (CI) in comparison to other observation-based signs.

Design, Setting, And Participants: A cross-sectional prospective study included all new outpatients evaluated by the authors at neurology consultation.

Discriminative validity of an abbreviated Semantic Verbal Fluency Test.

Unlabelled: Semantic verbal fluency (SVF) is one of the most widely used tests for cognitive assessment due to its diagnostic utility (DU).

Objective: our objective is to evaluate the DU to detect cognitive impairment (CI) of a short version of the SVF applied in 30 seconds (SVF).

Methods: a prospective sample of consecutive patients evaluated in a Neurology Unit between December 2016 and December 2017 were assessed with the Global Deterioration Scale (GDS), 30-second and 60-second SVF tests (animals), and the Fototest, which includes a fluency task of people's names.