The paper gives the results of analyzing the hemostatic system in 26 patients with various neurosurgical diseases on the basis of routine laboratory biochemical tests and thromboelastographic indicators. In all the patients, the pattern of the disease contained an epilepsy syndrome that required mono- or combination therapy with valproic acid. Laboratory indicators of clinical hypocoagulation were found to develop during the use of valproic acid, and its monotherapy in particular. Hemorrhagic complications were also analyzed in not only the immediate, but also late postoperative period (for as long as 6 months after surgery). Two cases of severe late complications, such as formation of chronic subdural hematomas requiring surgical intervention, were diagnosed in the valproate monotherapy group. A tactic using a thromboelastographic technique is proposed to prepare these patients for further neurosurgical intervention.
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