Artikel
Cerebral interstitial matrix metalloproteinase-9 (MMP-9) in patients following subarachnoid hemorrhage (SAH)
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Veröffentlicht: | 16. September 2010 |
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Objective: MMP-9 is involved in the pathophysiology of ischemic stroke and might play a role in delayed ischemic injury due to vasospasm in SAH patients. The aim of this pilot study, was to determine de value of brain MMP-9 in SAH patients.
Methods: Bedside microdialysis was performed in 11 SAH patients (2F/9M, 51±10 years, WFNS Grade: 2–5). Probes were placed intraoperatively in brain areas at risk for delayed cerebral ischemia. MMP-9 was measured by zymographic analysis on microdialysates obtained at the day of bleeding (D0) and daily until day seven after SAH.
Results: Mean brain MMP-9 values at day 0 were 0.02 (range: 0–0.07) pg/ml in low grade (WFNS 2; n=4) versus 4.2 (range: 0.09–17.3) pg/ml in high grade patients (WFNS 4-5; n=7). In patients developing clinically symptomatic vasospasm, mean brain MMP-9 concentration on day D0 was seven fold higher than in asymptomatic patients. In symptomatic patients MMP-9 remained elevated over the entire period of measurements, while in asymptomatic patients MMP-9 was undetectable after 24 h. In one patient with no ischemic injury, MMP-9 increased, possibly in relation to bacterial meningitis.
Conclusions: We show for the first time that brain MMP-9 is increased in poor grade SAH patients and might be considered as a potential marker of delayed cerebral ischemia. Further studies are needed to confirm our preliminary results.