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Neurology. 2009 Mar 10;72(10):915-21. doi: 10.1212/01.wnl.0000344168.05315.9d.

Acute ischemic stroke: imaging-guided tenecteplase treatment in an extended time window.

Author information

1
Department of Neurology, Radiology, and Centre for Clinical Epidemiology and Biostatistics, John Hunter Hospital/Hunter Medical Research Institute, University of Newcastle, Australia. mark.parsons@hnehealth.nsw.gov.au

Abstract

BACKGROUND:

Tenecteplase is a modified tissue plasminogen activator with a longer half-life and higher fibrin specificity than alteplase.

METHODS:

We conducted a prospective, nonrandomized, pilot study of 0.1 mg/kg IV tenecteplase given 3 to 6 hours after ischemic stroke onset. For a control group, we used patients contemporaneously treated with sub-3-hour 0.9 mg/kg IV alteplase following standard selection criteria. All patients underwent pretreatment and 24-hour perfusion/angiographic imaging with CT or MRI. Eligibility criteria for tenecteplase (but not alteplase) treatment included a perfusion lesion at least 20% greater than the infarct core, with an associated vessel occlusion. Primary outcomes, assessed blind to treatment group, were reperfusion (reduction in baseline-24-hour mean transit time lesion) and major vessel recanalization.

RESULTS:

Fifteen patients received tenecteplase, and 35 patients received alteplase. The tenecteplase group had greater reperfusion (mean 74% vs 44% in the alteplase group, p = 0.01) and major vessel recanalization (10/15 tenecteplase vs 7/29 alteplase, p = 0.01). Despite later time to treatment, more tenecteplase patients (10/15 vs 7/35 alteplase, p = 0.001) had major neurologic improvement at 24 hours (NIH Stroke Scale reduction > or = 8). Four of the alteplase patients and none of the tenecteplase patients had parenchymal hematoma at 24 hours.

CONCLUSIONS:

Tenecteplase 0.1 mg/kg, using advanced imaging guidance in an extended time window, may have significant biologic efficacy in acute ischemic stroke. The imaging selection differences between the tenecteplase and alteplase groups prevent a conclusive efficacy comparison. Nonetheless, these results lend support for randomized trials comparing tenecteplase with alteplase, preferably incorporating penumbral/angiographic imaging selection.

[Indexed for MEDLINE]

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