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Seventeen patients were randomized to intra\u2010arterial alteplase (0.225mg\/kg), and 19 received placebo. At 48\u2009hours, patients had brain perfusion\/diffusion\u2010weighted magnetic resonance imaging (MRI) and MRI\u2010spectroscopy. The primary outcome was the difference in the proportion of patients with areas of hypoperfusion on MRI. Secondary outcomes were the infarct expansion ratio (final to initial infarction volume), and the N\u2010acetylaspartate (NAA) peak relative to total creatine as a marker of neuronal integrity.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The prevalence of hypoperfusion was 24% with intra\u2010arterial alteplase, and 58% with placebo (adjusted odds ratio\u00a0=\u00a00.20, 95% confidence interval [CI]\u00a0=\u00a00.04\u20130.91,\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0=\u20090.03). Among 14 patients with final eTICI 3 scores, hypoperfusion was found in 1 of 7 (14%) in the alteplase group and 3 of 7 (43%) in the placebo group. Abnormal brain perfusion was associated with worse functional outcome at day 90. Alteplase significantly reduced the infarct expansion ratio compared with placebo (median [interquartile range (IQR)]\u00a0=\u00a00.7 [0.5\u20131.2] vs 3.2 [1.8\u20135.7],\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0=\u20090.01) and resulted in higher NAA peaks (median [IQR]\u00a0=\u00a01.13 [0.91\u20131.36] vs 1.00 [0.74\u20131.22],\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0&lt;\u20090.0001).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Interpretation<\/jats:title>\n                    <jats:p>There is a high prevalence of areas of hypoperfusion following thrombectomy despite successful reperfusion on angiography. Adjunct alteplase enhances brain reperfusion, which results in reduced expansion of the infarction and improved neuronal integrity. 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