Impaired platelet function associated with parenteral nafcillin.
A 44-year-old Caucasian female was admitted with a subarachnoid hemorrhage owing to a multilobular tubular anterior communicating artery aneurysm. Eleven days after the original craniotomy, an epidural hematoma was evacuated. The patient was placed on empiric nafcillin antimicrobial coverage (two g every six hours). Within 24 hours, the onset of epistaxis and oozing of blood from the endotracheal tube and craniotomy site was noted. Recurrent subdural and epidural hematomas necessitated a third emergent craniotomy. The development of an acquired qualitative platelet defect was suggested by the findings of a prolonged template bleeding time and markedly abnormal platelet aggregation/ATP release studies despite a normal platelet count. Nafcillin therapy was immediately discontinued. Clinical bleeding resolved. Subsequent bleeding times and platelet aggregation studies confirmed the nafcillin-induced platelet dysfunction.[1]References
- Impaired platelet function associated with parenteral nafcillin. Jeter, E.K., Scott, A., Kizer, J., Lazarchick, J. Ann. Clin. Lab. Sci. (1990) [Pubmed]
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