Burr-hole irrigation with closed-system drainage is a common surgical method used for chronic subdural haematoma. However, the subdural space with air that entered during surgery sometimes remains for a prolonged period after surgery and may hamper uncomplicated healing of the subdural space. We combined a simple procedure, insufflation of carbon dioxide (CO2) into the subdural space through a drainage catheter, with conventional burr-hole irrigation and closed-system drainage. By this additional procedure, both the subdural space and the gas within the space decreased rapidly, and the subdural drain could be removed within 24 h. By promoting obliteration of the subdural space, this simple combined technique may contribute to early recovery and discharge of patients, and to a reduction in the recurrence rate of the disease.
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