Pressure reactivity index correlates with metabolic dysfunction in a porcine model of intracerebral hemorrhage
OBJECTIVE: We correlated oxygen, flow, and pressure indices of cerebrovascular reactivity (CR) with extracellular cerebral metabolite concentrations in a porcine model of intracerebral hemorrhage (ICH). METHODS: Continuous advanced multimodal monitoring including microdialysis, cerebral blood flow a...
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| Main Authors: | , , , , , , , |
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| Format: | Chapter/Article Conference Paper |
| Language: | English |
| Published: |
13 January 2012
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| In: |
Intracranial pressure and brain monitoring XIV
Year: 2012, Volume: 114, Pages: 363-367 |
| DOI: | 10.1007/978-3-7091-0956-4_70 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/978-3-7091-0956-4_70
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| Author Notes: | Edgar Santos, Berk Orakcioglu, Modar M. Kentar, Jennifer Diedler, Yoichi Uozumi, Michael Schöll, Andreas Unterberg, Oliver W. Sakowitz |
| Summary: | OBJECTIVE: We correlated oxygen, flow, and pressure indices of cerebrovascular reactivity (CR) with extracellular cerebral metabolite concentrations in a porcine model of intracerebral hemorrhage (ICH). METHODS: Continuous advanced multimodal monitoring including microdialysis, cerebral blood flow and P(br)O(2) probes were placed 1 cm in front of the coronal suture in the grey/white matter junction. Following a period of 1 h of monitoring, an autologous arterial ICH with defined volumes (3 mL) was induced. Pressure-, oxygen-, and flow-related autoregulation indices (PRx, ORx, and FRx) were simultaneously calculated and correlated hourly with extracellular cerebral metabolites, including glucose, lactate, pyruvate, and glutamate. RESULTS: Seventeen swine were monitored on average 12 continuous hours per animal. FRx correlated highly with ORx (0.96, P = <0.001), but values of both FRx and ORx > 0.2 did not correlate with any microdialysis metabolite. Values of PRx > 0.2 correlated highly (0.65, P < 0.001) with the lactate/pyruvate ratio, values of PRx > 0.3 correlated with glutamate (0.67, P < 0.05), the lactate/pyruvate ratio (0.60, P < 0.01), and P(br)O(2) (-0.65, P < 0.01). CONCLUSIONS: We found evidence for impaired CR in a porcine model of ICH. The findings suggest that, among other parameters of CR, positive PRx coefficients have the highest significance and could be associated with microdialysis alterations during hypoxic events. |
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| Item Description: | First online: 13 January 2012 |
| Physical Description: | Online Resource |
| ISBN: | 9783709109564 |
| DOI: | 10.1007/978-3-7091-0956-4_70 |