(Stroke. 2001;32:1330.)
© 2001 American Heart Association, Inc.
Original Contributions |
Hemorrhagic Transformation of Ischemic Brain Tissue
Asymptomatic or Symptomatic?
From the Department of Neurology, University of Heidelberg (Germany) (C.B., T.S., W-R.S., W.H.); Department of Neuroradiology, University of Dresden (Germany) (R. von K.); Department of Neuroradiology, University of Rome (Italy) (M.F., L.B.); and Boehringer Ingelheim, Biberach, Germany (E.B.).
Correspondence to Christian Berger, MD, Department of Neurology, University of Heidelberg, Im Neuenheimer Feld 400, D-69221 Heidelberg, Germany. E-mail christian_berger{at}med.uni-heidelberg.de
Background and Purpose—The term symptomatic hemorrhage secondary to ischemic stroke implies a clear causal relationship between clinical deterioration and hemorrhagic transformation (HT) regardless of the type of HT. The aim of this study was to assess which type of HT independently affects clinical outcome.
Methods—We used the data set of the European Cooperative Acute Stroke Study (ECASS) II for a post hoc analysis. All patients had a control CT scan after 24 to 96 hours or earlier in case of rapid and severe clinical deterioration. HT was categorized according to radiological criteria: hemorrhagic infarction type 1 and type 2 and parenchymal hematoma type 1 and type 2. The clinical course was prospectively documented with the National Institutes of Health Stroke Scale and the modified Rankin Scale. The independent risk of each type of HT was calculated for clinical deterioration at 24 hours and disability and death at 3 months after stroke onset and adjusted for possible confounding factors such as age, severity of stroke syndrome at baseline, and extent of the ischemic lesion on the initial CT.
Results—Compared with absence of HT, only parenchymal hematoma type 2 was associated with an increased risk for deterioration at 24 hours after stroke onset (adjusted odds ratio, 18; 95% CI, 6 to 56) and for death at 3 months (adjusted odds ratio, 11; 95% CI, 3.7 to 36). All other types of HT did not independently increase the risk of late deterioration.
Conclusions—Only parenchymal hematoma type 2 independently causes clinical deterioration and impairs prognosis. It has a distinct radiological feature: it is a dense homogeneous hematoma >30% of the ischemic lesion volume with significant space-occupying effect.
Key Words: hematoma • hemorrhagic stroke • stroke outcome • thrombolysis
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