Temporal Crisis of Clinical Evidence.

This commentary examines the widening gap between evidence generation and the pace of innovation in medicine. New algorithms emerge before their predecessors have been validated, most never reaching the evidence required to justify their use. The gap is sharpest in critical care, where sepsis and acute respiratory distress syndrome exemplify a field that has multiplied predictive models without seeing them enter routine practice. Evidence takes years to build; by the time it arrives, clinical reality has changed: populations, co-interventions, and standards of care no longer match those in which evidence was produced. Our evidence hierarchies were designed for a world that held still long enough to be captured. Algorithmic velocity outpaces validation; models are trained on cohorts that have drifted by deployment. As personalization pushes stratification toward the single patient, conventional proof becomes untenable. The challenge is epistemologic: how we conceive, produce, and sustain proof in medicine.