Decision Fatigue in the Attending Surgeon: The Neural Accumulation of Micro-decisions Across an Operating Day.

Decision fatigue represents a progressive deterioration in decision-making quality arising from the cumulative cognitive burden of repeated choices. Attending surgeons navigate hundreds of micro-decisions throughout an operating day, encompassing instrument selection, tissue handling, and real-time adjustments in surgical approach, particularly when unexpected intraoperative findings demand immediate adaptive reasoning, each drawing upon finite neural resources. This review synthesizes current evidence on the neural mechanisms underlying decision fatigue in surgeons, with particular emphasis on prefrontal cortex (PFC) depletion, neurotransmitter dynamics, and metabolic constraints. We propose a taxonomy of intraoperative micro-decisions organized by strategic versus tactical, perceptual versus conceptual, time-critical versus deliberative, and reversible versus irreversible dimensions. Evidence demonstrates that decision fatigue manifests in measurable performance decrements, including prolonged operative times, increased error rates, and elevated complication risks, particularly in later cases of the operating day when unexpected intraoperative findings compound the risk posed by accumulated cognitive depletion. Individual factors such as experience, stress resilience, and sleep quality, together with systemic variables including case scheduling, team dynamics, and technology support, moderate these effects. Mitigation strategies encompass individual-level interventions (strategic breaks, nutrition optimization, cognitive training), team-based approaches including a second attending surgeon as cognitive monitor, technological cognitive offloading, and system-level organizational change. Critical research gaps include the need for real-time intraoperative neural monitoring, validated micro-decision taxonomies, and prospective trials of mitigation protocols. Understanding decision fatigue as a neurobiological phenomenon rather than a character flaw is essential for developing evidence-based strategies that optimize surgeon performance and patient safety.