Related Experiment Video
Updated: May 17, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
Recent changes in risk factors of chronic subdural hematoma
Yang-Won Sim1, Kyung-Soo Min, Mou-Seop Lee
1Department of Neurosurgery, Chungbuk National University College of Medicine, Cheongju, Korea.
Insights
Anticoagulants and antiplatelet agents are increasingly significant risk factors for chronic subdural hematoma (CSDH). Careful prescription of these medications is advised due to their growing importance in CSDH development.
Area of Science:
- Neurosurgery
- Geriatrics
- Pharmacology
Background:
- Chronic subdural hematoma (CSDH) is a common neurosurgical condition.
- Medications causing coagulopathies, like anticoagulants (ACs) and antiplatelet agents (APs), are known CSDH risk factors.
- Increasing use of ACs/APs, particularly in the elderly, necessitates re-evaluation of CSDH risk factors.
Purpose of the Study:
- To investigate the changing trends of risk factors for chronic subdural hematoma (CSDH).
- To analyze the specific impact of anticoagulants (ACs) and antiplatelet agents (APs) on CSDH development over time.
Main Methods:
- Retrospective review of 290 CSDH patients undergoing surgery between 1996 and 2010.
- Classification of patients into three groups based on presentation period: 1996-2000, 2001-2005, and 2006-2010.
- Comparative analysis of independent risk factors, including ACs/APs use, across the three time periods.
Main Results:
- The proportion of CSDH patients using ACs/APs significantly increased over time (4.2% to 15.7%).
- In the recent period (2006-2010), ACs/APs-related CSDH cases showed a lower association with trauma or alcohol compared to non-medication groups.
- The number of CSDH patients increased across the study periods, with the recent group having the highest proportion (41.7%).
Conclusions:
- Anticoagulants and antiplatelet agents have emerged as increasingly important risk factors for chronic subdural hematoma.
- The association between ACs/APs and CSDH is becoming more prominent, with a reduced role for traditional risk factors like trauma and alcohol in medication-associated cases.
- Healthcare providers should carefully consider the risk-benefit profile when prescribing ACs/APs due to their growing contribution to CSDH.
Objective:
Chronic subdural hematoma (CSDH) is a typical disease that is encountered frequently in neurosurgical practice. The medications which could cause coagulopathies were known as one of the risk factors of CSDH, such as anticoagulants (ACs) and antiplatelet agents (APs). Recently, the number of patients who are treated with ACs/APs is increasing, especially in the elderly population. With widespread use of these drugs, there is a need to study the changes in risk factors of CSDH patients.
Methods:
We retrospectively reviewed 290 CSDH patients who underwent surgery at our institute between 1996 and 2010. We classified them into three groups according to the time of presentation (Group A : the remote period group, 1996-2000, Group B : the past period group, 2001-2005, and Group C : the recent period group, 2006-2010). Also, we performed the comparative analysis of independent risk factors between three groups.
Results:
Among the 290 patients, Group A included 71 patients (24.5%), Group B included 98 patients (33.8%) and Group C included 121 patients (41.7%). Three patients (4.2%) in Group A had a history of receiving ACs/APs, 8 patients (8.2%) in Group B, and 19 patients (15.7%) in Group C. Other factors such as head trauma, alcoholism, epilepsy, previous neurosurgery and underlying disease having bleeding tendency were also evaluated. In ACs/APs related cause of CSDH in Group C, significantly less proportion of the patients are associated with trauma or alcohol compared to the non-medication group.
Conclusion:
In this study, the authors concluded that ACs/APs have more importance as a risk factor of CSDH in the recent period compared to the past. Therefore, doctors should prescribe these medications carefully balancing the potential risk and benefit.
Related Concept Videos
Hemorrhagic Stroke l: Introduction
Hemorrhagic Stroke ll: Pathophysiology
Increased Intracranial Pressure l: Introduction
Increased Intracranial Pressure ll: Pathophysiology
Cerebral Edema ll: Pathophysiology
Bacterial Meningitis II: Pathophysiology
