Does Diffusion Lesion Volume Above 70 mL Preclude Favorable Outcome Despite Post-Thrombolysis Recanalization?. Issue 4 (April 2016)

• Record Type: Journal Article
• Authors: Tisserand, Marie; Turc, Guillaume; Charron, Sylvain; Legrand, Laurence; Edjlali, Myriam; Seners, Pierre; Roca, Pauline; Lion, Stéphanie; Naggara, Olivier; Mas, Jean-Louis; Méder, Jean-François; Baron, Jean-Claude; Oppenheim, Catherine
• Is Part Of: Stroke. Volume 47:Issue 4(2016)
• Publication Date: 2016-04
• Subjects: acute stroke -- diffusion-weighted imaging -- ischemia -- MRI -- thrombolysis; Cerebrovascular disease -- Periodicals; Cerebral circulation -- Periodicals; 616.81
• DOI: 10.1161/STROKEAHA.115.012518
• Languages: English
• ISSNs: 0039-2499

Abstract

Abstract : Background and Purpose—: Whether to withhold recanalization treatment when the diffusion-weighted imaging (DWI) lesion exceeds a given volume is unsettled. Our aim was to assess the impact of recanalization on outcome in patients with baseline DWI lesion ≥70 mL (DWI≥70 mL) treated ⩽4.5 hours from onset. We hypothesized that recanalization is beneficial in a sizeable fraction of these patients and that this is associated with a larger DWI lesion reversal. Methods—: We analyzed 267 consecutive patients treated with intravenous recombinant tissue-type plasminogen activator for middle cerebral artery territory stroke in whom an occlusion was present on magnetic resonance angiography and 24-hour recanalization and 90-day clinical outcome could be assessed. After stratification relative to the 70-mL DWI lesion cut point, we calculated the odds ratio for recanalization of the primary arterial occlusive lesion (AOL score ≥2) to predict favorable outcome (modified Rankin scale score ⩽2). DWI lesion reversal was compared between recanalizers with DWI≥70 mL with favorable and unfavorable outcomes. Results—: Median (interquartile range) DWI lesion volume was 22 mL (10–60), and median onset time to imaging was 116 minutes (86–151). Twelve (22%) of the 54 patients with DWI≥70 mL experienced favorable outcome, of which 9 had recanalized. In patients with DWI≥70 mL, recanalization was significantly associated with favorable outcome after adjustment for age and National Institutes of Health Stroke Scale (odds ratio =4.72 [1.09–20.32]; P =0.0375). Among recanalizers with DWI≥70 mL, absolute and relative DWI reversal volumes were larger in those with favorable as compared with unfavorable outcome (18.8 mL [12.2–47.6] versus 8.5 mL [4.3–31.1]; P =0.17; and 19.6% [10.9–62.8] versus 8.7% [3.9–16.5], respectively; P =0.049). Conclusions—: Patients with DWI lesion volume ≥70 mL can benefit from recanalization after intravenous recombinant tissue-type plasminogen activator. This may partly reflect a larger amount of DWI lesion reversal.