• Agnes S Meidert, Johannes Kinzinger, Patrick Möhnle, Isabell Pekrul, Karsten Spiekermann, Jun Thorsteinsdottir, Josef Briegel, and Volker Huge.
• Department of Anaesthesiology, University Hospital of Munich (LMU), Munich, Germany. Electronic address: agnes_meidert@web.de.
• World Neurosurg. 2019 Jul 1; 127: 409-413.

BackgroundSevere factor V deficiency is an extremely rare coagulation disorder. Patients with factor V activity <5% usually become symptomatic in early childhood.Case DescriptionWe report the case of an 82-year-old woman with incidentally diagnosed severe factor V deficiency, who developed a symptomatic chronic subdural hematoma, requiring burr hole craniostomy. Successful management was achieved by a multidisciplinary approach. Preoperatively, factor V activity was increased from 2% to 50% by administration of 25 mL/kg body weight of fresh frozen plasma over 30 minutes under close cardiopulmonary monitoring in the intensive care unit. Straight afterward, the patient was transferred to the operating room where surgery was performed under general anesthesia. Burr hole craniostomy could be performed without perioperative complications. In the postoperative days, there was no relevant recurrence of the subdural hematoma in the follow-up computed tomography scans under frequent control of coagulation parameters. However, despite further transfusion of fresh frozen plasma, factor V activity did not increase >16%. The patient was discharged without any neurologic deficits. In a hemostaseologic follow-up 2 months after surgery, factor V activity <1% was confirmed with evidence of a factor V inhibitor in the modified Bethesda assay. Most likely, the patient suffered from an acquired form of factor V deficiency with preformed antibodies that had been boosted by the initial treatment with fresh frozen plasma.ConclusionsWe conclude that in this rare bleeding disorder, intracranial surgery was successfully managed because of a thoroughly planned perioperative therapeutic strategy. However, if there is time prior to surgery, a full checkup of the bleeding disorder is advisable.Copyright © 2019 Elsevier Inc. All rights reserved.

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