Mass General Brigham Jun 8 2026 Researchers found postoperative delirium was strongly associated with long-term cognitive decline and the effect was not explained by rehospitalizations, highlighting the long-term impact of delirium on brain health. Developing postoperative delirium remains the strongest predictor of long-term cognitive decline, a new study finds. Researchers from Mass General Brigham, Hebrew SeniorLife, and Brown University followed older adults after surgery to determine if