Recurrence-Free Chronic Subdural Hematomas: A Retrospective Analysis of the Instillation of Tissue Plasminogen Activator in Addition to Twist Drill or Burr Hole Drainage in the Treatment of Chronic Subdural Hematomas

OBJECTIVE: To evaluate whether increasing the volume drained from chronic subdural hematomas (SDHs) via either twist drill drainage (TDD) or burr hole drainage (BHD) followed by instillation of tissue plasminogen activator (tPA) is more efficacious than simple drainage alone. METHODS: Patients admitted over the course of 42 months (2007-2010) to a single institution for treatment of chronic SDH were retrospectively evaluated. RESULTS: There were 139 patients treated for chronic SDH; 54 patients were treated with BHD alone, 3 were treated with tPA after BHD, 85 were treated with TDD alone, and 12 were treated with tPA after TDD. Follow-up examinations were performed 1 month after treatment in 13 of 15 patients treated with tPA and 93 of 124 patients treated without tPA. Patients treated with tPA had a significantly lower rate of recurrence than patients treated without tPA (P = 0.041). Patients treated with BHD had a recurrence rate of 11.8%, whereas patients treated with BHD and tPA had 0% recurrence. Patients treated with TDD had a recurrence rate of 30%, whereas patients treated with TDD and tPA had 0% recurrence. Without tPA, BHD was found to be a significantly better treatment than TDD (P = 0.016). Mean drainage for TDD with tPA was 427.33 mL. There were no complications related to the administration of tPA. CONCLUSIONS: This study adds another therapeutic option for patients with chronic SDH requiring treatment. In this retrospective study, the addition of tPA increased the volume of hematoma drained and significantly reduced the incidence of recurrence requiring further intervention regardless of cranial access route. No complications occurred related directly or indirectly to the administration of tPA. Further study of this technique is warranted.