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Safety of endovascular treatment beyond the 6-h time window in 205 patients
Article first published online: 7 JAN 2013
© 2013 The Author(s) European Journal of Neurology © 2013 EFNS
European Journal of Neurology
Volume 20, Issue 6, pages 865–871, June 2013
How to Cite
Jung, S., Gralla, J., Fischer, U., Mono, M.-L., Weck, A., Lüdi, R., Heldner, M. R., Findling, O., El-Koussy, M., Brekenfeld, C., Schroth, G., Mattle, H. P. and Arnold, M. (2013), Safety of endovascular treatment beyond the 6-h time window in 205 patients. European Journal of Neurology, 20: 865–871. doi: 10.1111/ene.12069
- Issue published online: 12 MAY 2013
- Article first published online: 7 JAN 2013
- Manuscript Accepted: 1 NOV 2012
- Manuscript Received: 9 JUL 2012
- endovascular treatment;
- intra-arterial thrombolysis;
- unclear-onset stroke;
- wake-up stroke
Background and purpose
Intra-arterial treatment (IAT) is effective when performed within 6 h of symptom onset in selected stroke patients (‘T < 6H’). Its safety and efficacy is unclear when the patient has had symptoms for more than 6 h (‘T > 6H’) or for an unknown time (unclear-onset stroke, UOS), or woke up with a stroke (wake-up stroke, WUS). In this study we compared the safety of IAT in these four patient groups.
Eight-hundred and fifty-nine patients treated with IAT were enrolled. The main outcome parameters were clinical outcome [excellent: modified Rankin Scale (mRS) 0 or 1; or favorable: mRS 0–2] or mortality 3 months after treatment. Further outcome parameters were the rates of vessel recanalization, and cerebral and systemic hemorrhage.
Six-hundred and fifty-four patients were treated before (T < 6H) and 205 after 6 h or an unknown time (128 T > 6H, 55 WUS and 22 UOS). NIHSS scores were higher in UOS patients than in T < 6H patients, vertebrobasilar occlusion was more common in T > 6H and UOS patients, and middle cerebral artery occlusions less common in T > 6H than in T < 6H patients. Other baseline characteristics were similar. There was no significant difference in clinical outcome and the rate of hemorrhage in multivariable regression analysis.
Clinical outcome of our four groups of patients was similar with no increase of hemorrhage rates in patients treated after awakening, after an unknown time or more than 6 h. Our preliminary data suggest that treatment of such patients may be performed safely. If confirmed in randomized trials, this would have major clinical implications.