TY - JOUR
T1 - Collateral Status on Baseline Computed Tomographic Angiography and Intra-Arterial Treatment Effect in Patients With Proximal Anterior Circulation Stroke
AU - Berkhemer, Olvert A.
AU - Jansen, Ivo G. H.
AU - Beumer, Debbie
AU - Fransen, Puck S. S.
AU - van den Berg, Lucie A.
AU - Yoo, Albert J.
AU - Lingsma, Hester F.
AU - Sprengers, Marieke E. S.
AU - Jenniskens, Sjoerd F. M.
AU - Lycklama a Nijeholt, Geert J.
AU - van Walderveen, Marianne A. A.
AU - van den Berg, Rene
AU - Bot, Joseph C. J.
AU - Beenen, Ludo F. M.
AU - Boers, Anna M. M.
AU - Slump, Cornelis H.
AU - Roos, Yvo B. W. E. M.
AU - van Oostenbrugge, Robert J.
AU - Dippel, Diederik W. J.
AU - van der Lugt, Aad
AU - van Zwam, Wim H.
AU - Marquering, Henk A.
AU - Majoie, Charles B. L. M.
PY - 2016/3
Y1 - 2016/3
N2 - Background and Purpose- Recent randomized trials have proven the benefit of intra-arterial treatment (IAT) with retrievable stents in acute ischemic stroke. Patients with poor or absent collaterals (preexistent anastomoses to maintain blood flow in case of a primary vessel occlusion) may gain less clinical benefit from IAT. In this post hoc analysis, we aimed to assess whether the effect of IAT was modified by collateral status on baseline computed tomographic angiography in the Multicenter Randomized Clinical Trial of Endovascular Treatment of Acute Ischemic Stroke in the Netherlands (MR CLEAN). Methods- MR CLEAN was a multicenter, randomized trial of IAT versus no IAT. Primary outcome was the modified Rankin Scale at 90 days. The primary effect parameter was the adjusted common odds ratio for a shift in direction of a better outcome on the modified Rankin Scale. Collaterals were graded from 0 (absent) to 3 (good). We used multivariable ordinal logistic regression analysis with interaction terms to estimate treatment effect modification by collateral status. Results- We found a significant modification of treatment effect by collaterals (P=0.038). The strongest benefit (adjusted common odds ratio 3.2 [95% confidence intervals 1.7-6.2]) was found in patients with good collaterals (grade 3). The adjusted common odds ratio was 1.6 [95% confidence intervals 1.0-2.7] for moderate collaterals (grade 2), 1.2 [95% confidence intervals 0.7-2.3] for poor collaterals (grade 1), and 1.0 [95% confidence intervals 0.1-8.7] for patients with absent collaterals (grade 0). Conclusions- In MR CLEAN, baseline computed tomographic angiography collateral status modified the treatment effect. The benefit of IAT was greatest in patients with good collaterals on baseline computed tomographic angiography. Treatment benefit appeared less and may be absent in patients with absent or poor collaterals. Clinical Trial Registration- URL: [GRAPHICS] and [GRAPHICS] . Unique identifier: (NTR)1804 and ISRCTN10888758, respectively.
AB - Background and Purpose- Recent randomized trials have proven the benefit of intra-arterial treatment (IAT) with retrievable stents in acute ischemic stroke. Patients with poor or absent collaterals (preexistent anastomoses to maintain blood flow in case of a primary vessel occlusion) may gain less clinical benefit from IAT. In this post hoc analysis, we aimed to assess whether the effect of IAT was modified by collateral status on baseline computed tomographic angiography in the Multicenter Randomized Clinical Trial of Endovascular Treatment of Acute Ischemic Stroke in the Netherlands (MR CLEAN). Methods- MR CLEAN was a multicenter, randomized trial of IAT versus no IAT. Primary outcome was the modified Rankin Scale at 90 days. The primary effect parameter was the adjusted common odds ratio for a shift in direction of a better outcome on the modified Rankin Scale. Collaterals were graded from 0 (absent) to 3 (good). We used multivariable ordinal logistic regression analysis with interaction terms to estimate treatment effect modification by collateral status. Results- We found a significant modification of treatment effect by collaterals (P=0.038). The strongest benefit (adjusted common odds ratio 3.2 [95% confidence intervals 1.7-6.2]) was found in patients with good collaterals (grade 3). The adjusted common odds ratio was 1.6 [95% confidence intervals 1.0-2.7] for moderate collaterals (grade 2), 1.2 [95% confidence intervals 0.7-2.3] for poor collaterals (grade 1), and 1.0 [95% confidence intervals 0.1-8.7] for patients with absent collaterals (grade 0). Conclusions- In MR CLEAN, baseline computed tomographic angiography collateral status modified the treatment effect. The benefit of IAT was greatest in patients with good collaterals on baseline computed tomographic angiography. Treatment benefit appeared less and may be absent in patients with absent or poor collaterals. Clinical Trial Registration- URL: [GRAPHICS] and [GRAPHICS] . Unique identifier: (NTR)1804 and ISRCTN10888758, respectively.
KW - treatment outcome
KW - stent-retriever
KW - endovascular treatment
KW - cerebrovascular circulation
KW - retrievable stent
KW - stroke
KW - intra-arterial treatment
KW - collateral circulation
U2 - 10.1161/STROKEAHA.115.011788
DO - 10.1161/STROKEAHA.115.011788
M3 - Article
C2 - 26903582
VL - 47
SP - 768
EP - 776
JO - Stroke
JF - Stroke
SN - 0039-2499
IS - 3
ER -