Negative diffusion-weighted imaging after intravenous tissue-type plasminogen activator is rare and unlikely to indicate averted infarction.
Citation: Stroke. 44(6):1629-34, 2013 Jun.PMID: 23572476Institution: MedStar Washington Hospital CenterDepartment: NeurologyForm of publication: Journal ArticleMedline article type(s): Journal Article | Multicenter Study | Research Support, N.I.H., IntramuralSubject headings: *Diffusion Magnetic Resonance Imaging | *Fibrinolytic Agents/tu [Therapeutic Use] | *Stroke/pa [Pathology] | *Stroke/pc [Prevention & Control] | *Tissue Plasminogen Activator/tu [Therapeutic Use] | Adult | Aged | Aged, 80 and over | Cohort Studies | Diagnosis, Differential | Female | Fibrinolytic Agents/ad [Administration & Dosage] | Follow-Up Studies | Humans | Injections, Intravenous | Male | Middle Aged | Retrospective Studies | Stroke/di [Diagnosis] | Thrombolytic Therapy | Tissue Plasminogen Activator/ad [Administration & Dosage] | Treatment OutcomeLocal holdings: Available online from MWHC library: 1970 - present, Available in print through MWHC library: 1999 - 2006ISSN:- 0039-2499
Item type | Current library | Collection | Call number | Status | Date due | Barcode |
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Journal Article | MedStar Authors Catalog | Article | Available | 23572476 |
Available online from MWHC library: 1970 - present, Available in print through MWHC library: 1999 - 2006
BACKGROUND AND PURPOSE: Some patients treated with intravenous (IV) tissue-type plasminogen activator (tPA) have negative diffusion-weighted imaging (DWI) on follow-up imaging. Without a visible infarct, there may be uncertainty as to whether the patient was having a stroke that was averted by tPA or whether the symptoms had not been cerebrovascular in origin. We evaluated patients presenting with suspected acute stroke with a positive DWI lesion before IV tPA to determine the probability of finding a negative DWI up to 48 hours after treatment.
CONCLUSIONS: Averted infarction after IV tPA is rare, occurring in 0.9% of patients with pretreatment positive DWI evidence of acute ischemia. For IV tPA-treated patients who have a negative DWI on follow-up imaging, a cause other than acute stroke should be explored.
METHODS: We included patients from the Lesion Evolution in Stroke and Ischemia On Neuroimaging (LESION) project who had acute MRI screening with a positive DWI lesion before IV tPA treatment and had follow-up MRI up to 48 hours later. Experienced readers interpreted all acute and follow-up MRIs looking for ischemic lesions on DWI.
RESULTS: There were 231 patients who met study inclusion criteria, of which 225 patients (97.4%) had a persistent positive DWI corresponding to the acute stroke lesion on all follow-up imaging. Four patients (1.7%) had transient DWI lesion reversal with positive DWI on subsequent follow-up imaging. There were only 2 cases (0.9%) of complete DWI lesion reversal on all follow-up imaging.
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