Phenytoin Prophylaxis in Posttraumatic Head Injury
Objective: To identify the effectiveness of prophylactic phenytoin in preventing posttraumatic epilepsy. Design: Retrospective cohort study. Setting: Urban tertiary-care hospital and trauma center. Subjects: Patients admitted to the trauma service in 1989 with moderate to severe head injury surviving to discharge. Interventions: Divided into two groups based on prophylaxis with phenytoin. Measurements and Main Results: Ninety-one patients with moderate to severe head injury were admitted during the study period; 6 were excluded from analysis for prehospital seizure activity. Forty-one patients received no anticonvulsants; 44 received phenytoin alone or in combination with other agents. None of the patients experienced a seizure during hospitalization. Seventy-four percent of all phenytoin concentrations were subtherapeutic (serum phenytoin 10–20 μg/mL). Conclusions: The lack of seizure activity in the face of absent or subtherapeutic phenytoin concentrations brings into question the benefit of prophylactic therapy.