Outcomes and Mortality Factors After Surgery for Chronic Subdural Hematoma

Overview

This post hoc analysis of the FINISH randomized trial evaluated mortality rates and causes of death in 589 patients undergoing burr-hole drainage for chronic subdural hematoma (CSDH). Mortality was 6.6% at 6 months and 13.9% during a median follow-up of 16.4 months, with increased mortality associated with higher comorbidity burden, particularly dementia and cardiac arrhythmia. The leading causes of death were circulatory system diseases, accidents, and dementia.

Background

Chronic subdural hematoma (CSDH) is a common neurosurgical condition in elderly patients, often resulting from head trauma and brain atrophy. The incidence of CSDH is rising with aging populations, and it significantly shortens life expectancy, especially in patients with frailty and comorbidities. Despite its clinical importance, detailed data on mortality causes following surgical intervention for CSDH remain limited. The FINISH trial compared burr-hole drainage with and without irrigation in CSDH surgery and provided a basis for this mortality analysis.

Data Highlights

Key Findings

• Mortality increased significantly with the number of preoperative comorbidities, reaching 46.2% in patients with four comorbidities.
• Dementia was the strongest individual predictor of mortality (HR 5.31), followed by cardiac arrhythmia (HR 3.23), prior cerebrovascular events, and hypertension.
• The median time from surgery to death was 6.5 months, with deaths from accidents occurring earlier (median 2 months) than those from circulatory diseases or dementia.
• Diseases of the circulatory system were the most common cause of death, including myocardial infarction, heart failure, and cerebrovascular events.
• Accidental deaths included traumatic subdural hematomas and intracranial injury sequelae, highlighting risks of recurrent trauma post-surgery.
• Dementia-related deaths included Alzheimer’s disease and vascular dementia, underscoring the impact of neurodegenerative comorbidity on outcomes.

Clinical Implications

Clinicians should recognize that elderly CSDH patients with multiple comorbidities, especially dementia and cardiac arrhythmias, have a substantially increased risk of mortality after surgery. Comprehensive preoperative assessment and postoperative management should address these comorbid conditions to optimize outcomes. Additionally, preventive strategies to reduce accidental injuries post-discharge may improve survival.

Conclusion

Surgical treatment of CSDH in elderly patients is associated with significant mortality influenced by comorbidity burden, particularly dementia and cardiovascular disease. Understanding these risk factors and causes of death can guide tailored perioperative care and long-term management to improve patient survival.

References

1. FINISH Trial Group 2022 -- The Finnish Study of Intraoperative Irrigation Versus Drain Alone After Evacuation of Chronic Subdural Hematoma
2. Statistics Finland 2023 -- National Mortality Data and Cause of Death Classification
3. European Shortlist for Causes of Death 2012 -- Standardized Cause of Death Categories