Journal Article

Association of anemia and hemoglobin decrease during acute stroke treatment with infarct growth and clinical outcome

Heldner, Mirjam R., Arnold, Marcel, Liebeskind, David, Dobrocky, Tomas, Jung, Simon, Wiest, Roland, Burri, Meret S., Fischer, Samuel D. A., Mattle, Heinrich P., Fischer, Urs, Gralla, Jan, Schroth, Gerhard, Hakim, Arsany, Yu, Yannan, Scalzo, Fabien, Mono, Marie-Luise, Bellwald, Sebastian, El-Koussy, Marwan, Sarikya, Hakan, Nagler, Michael, Balasubramaniam, Rupashani, Mordasini, Pasquale

2018

Overview

Anemia is associated with worse outcome in stroke, but the impact of anemia with intravenous thrombolysis or endovascular therapy has hardly been delineated. The aim of this study was to analyze the role of anemia on infarct evolution and outcome after acute stroke treatment. 1158 patients from Bern and 321 from Los Angeles were included. Baseline data and 3 months outcome assessed with the modified Rankin Scale were recorded prospectively. Baseline DWI lesion volumes were measured in 345 patients and both baseline and final infarct volumes in 180 patients using CT or MRI. Multivariable and linear regression analysis were used to determine predictors of outcome and infarct growth. 712 patients underwent endovascular treatment and 446 intravenous thrombolysis. Lower hemoglobin at baseline, at 24h, and nadir until day 5 predicted poor outcome (OR 1.150-1.279) and higher mortality (OR 1.131-1.237) independently of treatment. Decrease of hemoglobin after hospital arrival, mainly induced by hemodilution, predicted poor outcome and had a linear association with final infarct volumes and the amount and velocity of infarct growth. Infarcts of patients with newly observed anemia were twice as large as infarcts with normal hemoglobin levels. Anemia at hospital admission and any hemoglobin decrease during acute stroke treatment affect outcome negatively, probably by enlarging and accelerating infarct growth. Our results indicate that hemodilution has an adverse effect on penumbral evolution. Whether hemoglobin decrease in acute stroke could be avoided and whether this would improve outcome would need to be studied prospectively.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Aged / Aged, 80 and over / Analysis / Anemia / Anemia - metabolism / Anesthesiology / Biochemistry / Biology and Life Sciences / Blood / Cardiovascular system / Care and treatment / Clinical outcomes / Drug therapy / Endovascular Procedures - methods / Evolution / Female / Flow velocity / Hematology / Hemoglobin / Hemoglobins / Hemoglobins - metabolism / Humans / Intravenous administration / Intravenous therapy / Laboratories / Linear Models / Magnetic Resonance Imaging / Male / Medicine and Health Sciences / Middle Aged / Mortality / Neurology / Outcome and process assessment (Medical care) / Patient outcomes / Patients / Prospective Studies / Regression analysis / Research and Analysis Methods / Retrospective Studies / Stroke / Stroke - complications / Stroke - metabolism / Stroke - therapy / Studies / Thrombolysis / Thrombolytic Therapy - methods