Medical Residents’ Work Hours in Mexico

Abstract

We trace the evolution of resident work hours in Mexico, a training model introduced in the mid-twentieth century based on total clinical immersion. For decades, shifts exceeding 100 hours per week and 36-hour on-call duties were standard, defended as necessary for clinical exposure but ultimately raising serious concerns about occupational health, patient safety, and educational quality. Regulatory ambiguity generated wide institutional variability until the 2012 standard NOM-001-SSA3, which addressed graduate medical education but set no explicit hourly limits.

Responding to mounting evidence on fatigue and institutional pressure, NOM-001-SSA-2023 now caps duty hours at 80 per week, limits residents to two calls a week, and introduces the ABCD rotating model, assigning one duty every four days to curb cumulative fatigue. The chapter reviews physiological and cognitive consequences of chronic sleep deprivation —cardiovascular risk, metabolic disorders, memory impairment— and its association with increased medical errors.

International benchmarks are analyzed: the 80-hour ACGME rule in the United States; Europe’s 48-hour Working Time Directive; Quebec’s 72-hour limit; and Japan’s recent reforms aimed at preventing karōshi (death from overwork). Alternative shift structures such as 12×12 and 24×24 are discussed, highlighting benefits and operational challenges.

The text underscores the ambiguous legal status of Mexican residents, straddling student and worker categories, which complicates full labor protection. It calls for tighter university oversight, adequate financing, and a cultural shift that prioritizes resident well-being, faculty supervision, and proper rest facilities. The chapter concludes that dignified training environments are not merely a welfare issue; they are fundamental to patient safety and to the future quality of healthcare delivery.