Intravenous thrombolysis and platelet count.

Neurology

From the Stroke Center and Department of Neurology (H.G., D.J.S., C.T., R.L., A. Polymeris, P.A.L., N.P., S.T.E.), University Hospital Basel and University of Basel, Switzerland; Department of Clinical Neurosciences (H.G., A.S.A.S.), University of Calgary, Alberta, Canada; Department of Neurology (D.S., S.R., S.C., G.S., T.T.), Helsinki University Central Hospital, Finland; Department of Neurology (C.H., H.A., C.G., P.A.R.), University Hospital Heidelberg, Germany; Department of Neurology (S.M.Z., T.P.Z., Y.B.R., P.J.N.), Academic Medical Center, Amsterdam, the Netherlands; University Lille (S.M., D.L., C.C.), Inserm, CHU Lille, U1171-Degenerative & Vascular Cognitive Disorders, France; Department of Neurology (O.B., P.M.), Centre Hospitalier Universitaire Vaudois and University of Lausanne, Switzerland; Stroke Unit (A.Z., L.V.), Department of Neuroscience, Nuovo Ospedale Civile S. Agostino-Estense, AUSL Modena, Italy; Neurology Clinic (V.P., D.R.J.), Clinical Centre of Serbia, Belgrade; Department of Neurology (G.K.), Kantonsspital St. Gallen, Switzerland; Department of Clinical and Experimental Sciences (A. Pezzini), Neurology Clinic, University of Brescia, Italy; Medical Faculty (D.R.J.), University of Belgrade, Serbia; Institute of Neuroscience and Physiology (T.T.), Sahlgrenska Academy at University of Gothenburg; Department of Neurology (T.T.), Sahlgrenska University Hospital, Gothenburg, Sweden; and Neurorehabilitation Unit (S.T.E.), University of Basel and University Center for Medicine of Aging and Rehabilitation, Felix Platter Hospital, Switzerland.

Published: February 2018

Objective: To study the effect of platelet count (PC) on bleeding risk and outcome in stroke patients treated with IV thrombolysis (IVT) and to explore whether withholding IVT in PC < 100 × 10/L is supported.

Methods: In this prospective multicenter, IVT register-based study, we compared PC with symptomatic intracranial hemorrhage (sICH; Second European-Australasian Acute Stroke Study [ECASS II] criteria), poor outcome (modified Rankin Scale score 3-6), and mortality at 3 months. PC was used as a continuous and categorical variable distinguishing thrombocytopenia (<150 × 10/L), thrombocytosis (>450 × 10/L), and normal PC (150-450 × 10/L [reference group]). Moreover, PC < 100 × 10/L was compared to PC ≥ 100 × 10/L. Unadjusted and adjusted odds ratios (ORs) with 95% confidence intervals (CIs) from the logistic regression models were calculated.

Results: Among 7,533 IVT-treated stroke patients, 6,830 (90.7%) had normal PC, 595 (7.9%) had thrombocytopenia, and 108 (1.4%) had thrombocytosis. Decreasing PC (every 10 × 10/L) was associated with increasing risk of sICH (OR 1.03, 95% CI 1.02-1.05) but decreasing risk of poor outcome (OR 0.99, 95% CI 0.98-0.99) and mortality (OR 0.98, 95% CI 0.98-0.99). The risk of sICH was higher in patients with thrombocytopenic than in patients with normal PC (OR 1.73, 95% CI 1.24-2.43). However, the risk of poor outcome (OR 0.89, 95% CI 0.39-1.97) and mortality (OR 1.09, 95% CI 0.83-1.44) did not differ significantly. Thrombocytosis was associated with mortality (OR 2.02, 95% CI 1.21-3.37). Forty-four (0.3%) patients had PC < 100 × 10/L. Their risks of sICH (OR 1.56, 95% CI 0.48-5.07), poor outcome (OR 1.63, 95% CI 0.82-3.24), and mortality (OR 1.38, 95% CI 0.64-2.98) did not differ significantly from those of patients with PC ≥ 100 × 10/L.

Conclusion: Lower PC was associated with increased risk of sICH, while higher PC indicated increased mortality. Our data suggest that PC modifies outcome and complications in individual patients, while withholding IVT in all patients with PC < 100 × 10/L is challenged.

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http://dx.doi.org/10.1212/WNL.0000000000004982	DOI Listing

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