A quasi-experimental design where internal medicine residents in a high complexity hospital were assessed after a 24-hour shift for cognitive impairment by a trained neurologist.

The investigators conducted a cross sectional study during the 2014-2016 period in a high complexity school hospital in Buenos Aires. Second and third year Internal Medicine residents who consented to participate were included.

A neurologist conducted a cognitive evaluation to the residents who had done 24 hours shifts (with sleep deprivation) within 6 hours of its end.

Auditory memory deficit was evaluated (PASAT - Paced Auditory Serial Addition Test), verbal fluency (FAS), direct and indirect Digit-Span, Rey auditory verbal learning test (RAVLT) and Continuous Performance Test 2 (CPT2).

Results were presented as means of standardized scores (z score) with their interquartile range (IQR).

Inclusion Criteria:

• Internal Medicine residents on the second or third year of formation.

Exclusion Criteria:

• Denial to participate in the study or to the informed consent.

Internal Medicine residents in formation who were on the second or third year of the Internal Medicine residency of the Italian Hospital of Buenos Aires who work 24 hours shifts and whose work day continues to a maximum of 36 total hours and who consented to the study.