When older adults undergo surgery, doctors often focus on complications such as infections, bleeding, or heart problems.
Yet one of the most common complications affects the brain. Known as postoperative delirium, this condition can cause sudden confusion, disorientation, memory difficulties, and changes in behavior.
Many families assume that delirium is temporary. In some cases, symptoms improve within days or weeks. However, researchers have increasingly questioned whether the effects truly disappear. A new study published in JAMA Internal Medicine suggests that the impact of delirium may continue for many years after surgery.
Researchers from Mass General Brigham, Hebrew SeniorLife, and Brown University followed hundreds of older adults to explore how delirium affects long-term cognitive health. Their goal was to determine whether later medical problems could explain the decline often seen after delirium.
The study included 560 adults aged 70 years and older. All participants were part of the Successful Aging after Elective Surgery project, commonly known as SAGES. Researchers monitored their cognitive abilities using an extensive testing program that measured memory, attention, language, and other thinking skills.
Participants completed these assessments every six months for three years and then annually for as long as six years. This long follow-up period allowed the researchers to observe how brain function changed over time.
The results showed that people who experienced delirium after surgery had significantly faster cognitive decline than those who did not develop delirium. Their memory and thinking skills worsened at a pace that exceeded what would normally be expected from healthy aging.
The researchers also looked at rehospitalizations. Older adults who develop delirium often have more health problems and are more likely to return to the hospital. Additional hospital stays can place stress on the body and brain, so the investigators suspected that rehospitalizations might partly explain the long-term decline.
The data confirmed that rehospitalizations were associated with poorer cognitive outcomes. Each hospital admission was linked to worsening performance on cognitive tests. Patients who had delirium also experienced more rehospitalizations than those who did not.
However, when the researchers carefully analyzed the results, they found that rehospitalizations did not account for the relationship between delirium and cognitive decline. Even after considering later hospital stays, delirium remained the strongest predictor of long-term cognitive deterioration.
This finding was unexpected. The researchers initially believed that serious illnesses requiring hospital treatment would explain at least some of the decline. Instead, the results suggest that delirium itself may have lasting effects on the brain.
Scientists are still trying to understand why this happens. One possibility is that delirium triggers inflammatory processes that damage brain cells. Another possibility is that delirium reveals early brain changes that were already developing but had not yet become noticeable. It may also involve a combination of several biological processes.
The study reinforces the idea that delirium should not be dismissed as a temporary inconvenience. Instead, it may be an important warning sign of future cognitive problems. Because delirium is often preventable, healthcare providers are increasingly focusing on strategies to reduce its occurrence.
Measures such as helping patients remain oriented, promoting regular sleep, encouraging early mobility, ensuring adequate hydration, and avoiding unnecessary medications have been shown to lower delirium risk in some settings. These relatively simple interventions could potentially have benefits that extend far beyond the hospital stay.
This research has several strengths, including its long follow-up period, detailed cognitive testing, and large group of older participants. While it cannot definitively prove cause and effect, the evidence strongly suggests that delirium is closely tied to long-term changes in brain health.
Overall, the findings provide an important message for doctors, patients, and families. Preventing delirium may not only improve recovery after surgery but may also help protect memory and thinking abilities for years to come. Future research will be needed to uncover exactly how delirium affects the brain and how its long-term consequences can be reduced.
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Source: Mass General Brigham.
