A new study suggests that major surgery may have lasting effects on brain health in older adults, extending beyond the well-known physical challenges of recovery. Researchers found that nearly one in seven seniors experienced a substantial decline in memory and thinking abilities after surgery, with cognitive deterioration continuing for years afterward.
The study followed 560 adults aged 70 and older who had no signs of dementia before undergoing major elective procedures, including hip replacements and abdominal surgeries. Participants were monitored for up to six years to assess changes in cognitive function over time.
The findings, published in the Journal of the American Geriatrics Society, identified three major factors associated with a higher risk of severe cognitive decline: advanced age, lower cognitive performance before surgery, and the development of postoperative delirium—a condition characterized by confusion, disorganized thinking, and altered awareness that can occur shortly after an operation.
Understanding Brain Health After SurgeryThe impact of surgery and anesthesia on the brain has been a subject of research for decades. Scientists have identified a group of conditions known as postoperative neurocognitive disorders (PND), which can affect memory, attention, and overall cognitive performance following surgery.
Previous studies have linked these disorders to increased mortality and long-term cognitive impairment, particularly among older adults. As the population ages, understanding these risks has become increasingly important.
With more than one-fifth of the U.S. population expected to be over 65 by 2030, many older adults face difficult decisions about undergoing major surgery. While procedures may improve mobility and quality of life, they may also carry risks for long-term cognitive health.
The StudyTo better understand which patients are most vulnerable, researchers analyzed data from the Successful Aging after Elective Surgery (SAGES) study, a large multicenter research project.
The analysis included 560 adults aged 70 years and older who underwent major non-cardiac surgeries requiring hospitalization for at least three days. Common procedures included joint replacements and abdominal operations.
Researchers assessed participants' cognitive abilities before surgery using standardized neuropsychological tests. Following surgery, patients were monitored for delirium using the Confusion Assessment Method, a widely used diagnostic tool.
To strengthen the findings, the researchers also followed a comparison group of 119 older adults who did not undergo surgery.
Three Distinct Cognitive TrajectoriesThe analysis revealed three different patterns of cognitive aging after surgery.
Approximately 25% of participants maintained stable cognitive performance throughout the follow-up period.
The largest group, representing 59% of patients, experienced only a mild decline consistent with normal aging.
However, nearly 15% showed a pronounced and progressive deterioration in memory and thinking abilities that continued to worsen over time.
Among all the factors examined, postoperative delirium emerged as the strongest predictor of severe long-term decline. Patients who developed delirium were about twice as likely to experience significant cognitive deterioration compared with those who did not.
Implications for Patient CareThe researchers say the findings provide valuable insight into how major surgery may influence long-term brain health in older adults.
They emphasize that additional studies involving larger and more diverse populations are needed before the results can be fully incorporated into clinical practice.
Nevertheless, the ability to identify high-risk patients before surgery could help physicians implement preventive measures, particularly strategies aimed at reducing the risk of postoperative delirium.
Such approaches may ultimately help preserve cognitive function and improve long-term outcomes for older surgical patients.
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