Long-Term Mortality and Cognitive Risks After Chronic Subdural Hematoma Surgery

Surgery for chronic subdural hematoma (cSDH) is often effective in the short term, but new research shows patients face significantly higher risks of death and cognitive challenges for up to a decade afterward. A long-term study conducted by Inselspital and the University of Bern followed 359 patients who underwent cSDH surgery between 2012 and 2016, comparing their outcomes to the general Swiss population over approximately ten years.

The findings reveal that ten years after surgery, only 55.5 percent of patients were still alive, compared to 73.5 percent of the general population. This indicates a persistent elevation in mortality risk that extends well beyond the initial recovery period. In addition to increased mortality, many long-term survivors experience ongoing limitations in cognitive function and daily living activities.

Understanding Chronic Subdural Hematoma

A chronic subdural hematoma is a slow accumulation of blood between the brain and the skull, typically resulting from a minor head injury. It is one of the most common neurosurgical conditions in older adults. The condition has become more prevalent in recent decades due to an aging population and increased use of blood-thinning medications.

Surgical treatment usually involves a brief procedure to drain the blood and relieve pressure on the brain. While most patients recover well initially, the long-term consequences of the condition are now better understood thanks to extended follow-up studies.

Persistent Health Risks After Surgery

The study found that mortality rates remained elevated throughout the entire ten-year observation period. Patients who had cSDH surgery faced a twofold increased risk of death compared to the general population. Beyond survival, cognitive deficits and functional impairments were commonly reported among those who lived longer after the procedure.

These challenges can affect memory, concentration, and the ability to perform everyday tasks, significantly impacting quality of life. The researchers emphasized that while surgery addresses the immediate threat posed by the hematoma, it does not eliminate the underlying vulnerabilities that contribute to poorer long-term outcomes.

Implications for Patient Care

The results highlight the need for extended monitoring and support for patients after cSDH surgery. Healthcare providers should consider long-term follow-up plans that include cognitive assessments, functional evaluations, and management of vascular risk factors. Addressing modifiable risks such as hypertension, diabetes, and medication use may help improve outcomes.

preventive strategies — particularly fall prevention in older adults and careful management of anticoagulant therapies — could reduce the incidence of cSDH and its associated burdens.

Conclusion

Chronic subdural hematoma surgery offers effective short-term relief, but the condition carries significant long-term risks. Patients remain at higher risk for mortality and cognitive decline for up to ten years after the procedure. These findings underscore the importance of viewing cSDH not as an isolated event, but as a marker of broader health vulnerabilities requiring ongoing attention.

By integrating long-term surveillance and proactive care into clinical practice, providers can better support patients in navigating the extended recovery journey and improving both survival and quality of life.