title: Pretreatment diffusion- and perfusion-MR lesion volumes have a crucial influence on clinical response to stroke thrombolysis.
abstract: We hypothesized that pretreatment magnetic resonance imaging (MRI) diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) lesion volumes may have influenced clinical response to thrombolysis in the Echoplanar Imaging Thrombolytic Evaluation Trial (EPITHET). In 98 patients randomized to intravenous (IV) tissue plasminogen activator (tPA) or placebo 3 to 6 h after stroke onset, we examined increasing acute DWI and PWI lesion volumes (Tmax-with 2-sec delay increments), and increasing PWI/DWI mismatch ratios, on the odds of both excellent (modified Rankin Scale (mRS): 0 to 1) and poor (mRS: 5 to 6) clinical outcome. Patients with very large PWI lesions (most had internal carotid artery occlusion) had increased odds ratio (OR) of poor outcome with IV-tPA (58% versus 25% placebo; OR=4.13, P=0.032 for Tmax +2-sec volume >190 mL). Excellent outcome from tPA treatment was substantially increased in patients with DWI lesions <18 mL (77% versus 18% placebo, OR=15.0, P<0.001). Benefit from tPA was also seen with DWI lesions up to 25 mL (69% versus 29% placebo, OR=5.5, P=0.03), but not for DWI lesions >25 mL. In contrast, increasing mismatch ratios did not influence the odds of excellent outcome with tPA. Clinical responsiveness to IV-tPA, and stroke outcome, depends more on baseline DWI and PWI lesion volumes than the extent of perfusion-diffusion mismatch.
authors.affiliation: Department of Neurology, John Hunter Hospital, University of Newcastle, Newcastle, New South Wales, Australia. mark.parsons@hnehealth.nsw.gov.au
authors.forename: Mark W
authors.initials: MW
authors.lastname: Parsons
authors.forename: Soren
authors.initials: S
authors.lastname: Christensen
authors.forename: Patrick
authors.initials: P
authors.lastname: McElduff
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Levi
authors.forename: Ken S
authors.initials: KS
authors.lastname: Butcher
authors.forename: Deidre A
authors.initials: DA
authors.lastname: De Silva
authors.forename: Martin
authors.initials: M
authors.lastname: Ebinger
authors.forename: P Alan
authors.initials: PA
authors.lastname: Barber
authors.forename: Christopher
authors.initials: C
authors.lastname: Bladin
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Donnan
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Davis
mesh_terms: D000328:Adult; D000368:Aged; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000401:mortality; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging; D038524:Diffusion Magnetic Resonance Imaging; D004311:Double-Blind Method; D005260:Female; D005343:Fibrinolytic Agents / Q000627:therapeutic use*; D006801:Humans; D007262:Infusions, Intravenous; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D020521:Stroke / Q000000981:diagnostic imaging* / Q000188:drug therapy* / Q000401:mortality; D015912:Thrombolytic Therapy; D010959:Tissue Plasminogen Activator / Q000627:therapeutic use*
chemical_list: D005343:Fibrinolytic Agents; D010959:Tissue Plasminogen Activator