J Neurol Surg A Cent Eur Neurosurg 2014; 75(04): 251-258
DOI: 10.1055/s-0033-1355164
Original Article
Georg Thieme Verlag KG Stuttgart · New York

Neuroprotective Efficacy of Prophylactic Enteral and Parenteral Nimodipine Treatment in Vestibular Schwannoma Surgery: A Comparative Study

Christian Scheller
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Andreas Wienke
2   Institute of Medical Epidemiology, Biostatistics, and Informatics, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Franziska Wurm
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Sebastian Simmermacher
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Stefan Rampp
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Julian Prell
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Jens Rachinger
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Konstanze Scheller
3   Department of Oral and Maxillofacial Plastic Surgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Gershom Koman
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Christian Strauss
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
,
Eva Herzfeld
1   Department of Neurosurgery, University of Halle-Wittenberg, Sachsen-Anhalt, Germany
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Weitere Informationen

Publikationsverlauf

25. März 2013

27. Juni 2013

Publikationsdatum:
10. Oktober 2013 (online)

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Abstract

Background and Study Aims/Object Oral nimodipine improves neurologic outcome after aneurysmal subarachnoid hemorrhage. In addition, the neuroprotective efficacy of nimodipine has been revealed following skull base, laryngeal, and maxillofacial surgery. Pharmacokinetic investigations showed nimodipine to reach higher serum levels following parenteral versus enteral administration. Furthermore, a correlation between nimodipine levels in serum, cerebrospinal fluid, and nerve tissue could be quantified. These observations raise the question whether the proven neuroprotective effect of nimodipine is related to its serum level.

Patients/Material and Methods A consecutive series of 37 patients with vestibular schwannoma treated with nimodipine from the day before surgery until the seventh postoperative day was analyzed retrospectively. Both groups received standard dosages for enteral (n = 17) and parenteral (n = 20) nimodipine medication. Nimodipine levels were measured in pre- and postoperative serum and cerebrospinal fluid samples. Cochlear and facial nerve functions were documented before surgery, in the early postoperative course, and 1 year after surgery.

Results Facial nerve outcome was significantly better in the group with parenteral nimodipine medication (p = 0.038). Logistical regression analysis revealed a seven times smaller risk for a deterioration of facial nerve function in the group with parenteral treatment. There was no difference in hearing preservation between both groups despite tumor size tending to be larger in the parenteral group. Intraoperative (p = 0.004), postoperative (p = 0.001), and serum and cerebrospinal fluid (p = 0.024) nimodipine levels were significantly higher following parenteral administration as compared with enteral administration. Both groups were comparable regarding tumor size and extent of resection.

Conclusions These results support a dependency of nimodipine's neuroprotective efficacy on its serum levels. Parenteral nimodipine treatment produces higher serum levels and has a higher neuroprotective potency in vestibular schwannoma surgery compared with enteral treatment.