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[Hemorrhage into tha cavity of chronic subdural hematoma].

Mean quantity of daily hemorrhage into the hematoma cavity was determined at the craniotomy in 39 cases with chronic subdural hematoma. Mean daily hemorrhage amounted 6.7 per cent of hematoma volume. Those in infancy, adults younger or older than 70 years old were 6.8%, 6.9% and 6.2%, respectively. When the period from head trauma till the craniotomy was less 3 months, one fourth of cases showed more bleeding than 10% of hematoma content into the cavity. Over 3 months after the head trauma, hemorrhage decreased in volume, amounted less than 2%. The severer the clinical grading of chronic subdural hematoma was, the more the daily hemorrhage was. The cases with dementia demonstrated usually less hemorrhage. The daily hemorrhage into the hematoma cavity did not correlate clearly with the maximum breadth of subdural hematoma in CT scans or carotid angiograms. Not only bleeding but also its dilution and condensation in the subdural hematoma modifies the density of hematoma cavity in CT scans. There were many cases showing more hemorrhage at FDP levels among 320 and 640 micrograms/ml. The hemorrhage into the chronic subdural hematoma cavity is caused by imbalance of local hyper-fibrinolysis and coagulability and daily hemorrhage amounts 6.7% of hematoma content. Such interrupted or continuous hemorrhage results in aggravation of clinical symptoms and high density of hematoma space in CT scans.