Maria Uldall1, Marianne Juhler2, Anders Daehli Skjolding2, Christina Kruuse3, Inger Jansen-Olesen1, Rigmor Jensen4. 1. Danish Headache Center, Building 24, Department of Neurology, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 69, 2600 Glostrup, Denmark; Research Institute, Danish Headache Center, Glostrup, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 69, 2600 Glostrup, Denmark. 2. Department of Neurosurgery, The National Hospital, Rigshospitalet, University of Copenhagen, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark. 3. Research Institute, Danish Headache Center, Glostrup, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 69, 2600 Glostrup, Denmark; Department of Neurology, Herlev Hospital, University of Copenhagen, Herlev Ringvej 75, 2730 Herlev, Denmark. 4. Danish Headache Center, Building 24, Department of Neurology, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 69, 2600 Glostrup, Denmark. Electronic address: rigmor.jensen@regionh.dk.
Abstract
BACKGROUND: In preclinical neurological studies, monitoring intracranial pressure (ICP) in animal models especially in rodents is challenging. Further, the lack of methods for long-term ICP monitoring has limited the possibilities to conduct prolonged studies on ICP fluctuations in parallel to disease progression or therapeutic interventions. For these reasons we aimed to set up a simple and valid method for long-term ICP recordings in rats. NEW METHOD: A novel ICP method employing epidural probes was developed and validated by simultaneously ICP recordings in the lateral ventricle and in the epidural space. The two pressures were recorded twice a week for 59 days and the correlation was studied. RESULTS: The two pressure recordings correlated exceptionally well and the R(2) values on each recording day ranged between 0.99 and 1.00. However, the ventricular probes caused a number of complications including loss of patency and tissue damage probably due to cerebral infection, whereas the epidural probes were safe and reliable throughout the entire study. COMPARISON WITH EXISTING METHODS: Epidural probes are much easier to implant than ventricular probes. In addition, these new probes are far less invasive and induce no apparent mechanical tissue damage and highly decrease the infection risk associated with ICP recordings. CONCLUSION: Epidural ICP recorded with this new method is identical to the ventricular ICP for at least 59 days but is far less complicated and safer for the animals. The long-term method described is reliable, valid, inexpensive, and may be used in multiple disease models to study ICP.
BACKGROUND: In preclinical neurological studies, monitoring intracranial pressure (ICP) in animal models especially in rodents is challenging. Further, the lack of methods for long-term ICP monitoring has limited the possibilities to conduct prolonged studies on ICP fluctuations in parallel to disease progression or therapeutic interventions. For these reasons we aimed to set up a simple and valid method for long-term ICP recordings in rats. NEW METHOD: A novel ICP method employing epidural probes was developed and validated by simultaneously ICP recordings in the lateral ventricle and in the epidural space. The two pressures were recorded twice a week for 59 days and the correlation was studied. RESULTS: The two pressure recordings correlated exceptionally well and the R(2) values on each recording day ranged between 0.99 and 1.00. However, the ventricular probes caused a number of complications including loss of patency and tissue damage probably due to cerebral infection, whereas the epidural probes were safe and reliable throughout the entire study. COMPARISON WITH EXISTING METHODS: Epidural probes are much easier to implant than ventricular probes. In addition, these new probes are far less invasive and induce no apparent mechanical tissue damage and highly decrease the infection risk associated with ICP recordings. CONCLUSION: Epidural ICP recorded with this new method is identical to the ventricular ICP for at least 59 days but is far less complicated and safer for the animals. The long-term method described is reliable, valid, inexpensive, and may be used in multiple disease models to study ICP.
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