Abstract
Background
Critical closing pressure (CCP) denotes a threshold of arterial blood pressure (ABP) below which brain vessels collapse and cerebral blood flow ceases. Theoretically, CCP is the sum of intracranial pressure (ICP) and arterial wall tension (WT). The aim of this study is to describe the behavior of CCP and WT during spontaneous increases of ICP, termed plateau waves, in order to quantify ischemic risk.
Methods
To calculate CCP, we used a recently introduced multi-parameter method (CCPm) which is based on the modulus of cerebrovascular impedance. CCP is derived from cerebral perfusion pressure, ABP, transcranial Doppler estimators of cerebrovascular resistance and compliance, and heart rate. Arterial WT was estimated as CCPm-ICP. The clinical data included recordings of ABP, ICP, and transcranial Doppler-based blood flow velocity from 38 events of ICP plateau waves, recorded in 20 patients after head injury.
Results
Overall, CCPm increased significantly from 51.89 ± 8.76 mmHg at baseline ICP to 63.31 ± 10.83 mmHg at the top of the plateau waves (mean ± SD; p < 0.001). Cerebral arterial WT decreased significantly during plateau waves by 34.3 % (p < 0.001), confirming their vasodilatatory origin. CCPm did not exhibit the non-physiologic negative values that have been seen with traditional methods for calculation, therefore rendered a more plausible estimation of CCP.
Conclusions
Rising CCP during plateau waves increases the probability of cerebral vascular collapse and zero flow when the difference: ABP–CCP (the “collapsing margin”) becomes zero or negative.
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Acknowledgments
This study was supported by the National Institute of Health Research, Biomedical Research Centre (Neuroscience Theme), NIHR Senior Investigator Awards (JDP) and the Medical Research Council (Grants G0600986 and G9439390).
Conflict of interest
ICM+ Software is licensed by Cambridge Enterprise, Cambridge, UK, http://www.neurosurg.cam.ac.uk/icmplus/. MC and PS have a financial interest in a fraction of the licensing fee.
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Varsos, G.V., de Riva, N., Smielewski, P. et al. Critical Closing Pressure During Intracranial Pressure Plateau Waves. Neurocrit Care 18, 341–348 (2013). https://doi.org/10.1007/s12028-013-9830-5
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DOI: https://doi.org/10.1007/s12028-013-9830-5