Finding the most powerful measures of the effectiveness of tissue plasminogen activator in the NINDS tPA stroke trial.

Abstract:

BACKGROUND AND PURPOSE:We sought to identify the most powerful binary measures of the treatment effect of tissue plasminogen activator (tPA) in the National Institute of Neurological Disorders and Stroke (NINDS) rTPA Stroke Trial. METHODS:Using the Classification and Regression Tree (CART) algorithm, we evaluated binary cut points and combination of binary cut points with the 4 clinical scales and head CT imaging measures in the NINDS tPA Stroke Trial at 4 times after treatment: 2 hours, 24 hours, 7 to 10 days, and 3 months. The first analysis focused on detecting evidence of "early activity" of tPA with the use of outcome measures derived from the 2-hour and 24-hour clinical and radiographic measures. The second analysis focused on longer-term outcome and "efficacy" and used outcome measures derived from 7- to 10-day and 3-month measures. After identifying the cut points with the ability to classify patients into the tPA and placebo groups using part I data from the trial, we then used data from part II of the trial to validate the results. RESULTS:Of the 5 most powerful outcome measures for early activity of tPA, 4 involved the National Institutes of Health Stroke Scale (NIHSS) score at 24 hours or changes in the NIHSS score from baseline to 24 hours. The best overall single outcome measure was an NIHSS score

journal_name

Stroke

journal_title

Stroke

authors

Broderick JP,Lu M,Kothari R,Levine SR,Lyden PD,Haley EC,Brott TG,Grotta J,Tilley BC,Marler JR,Frankel M

doi

10.1161/01.str.31.10.2335

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

2335-41

issue

10

eissn

0039-2499

issn

1524-4628

journal_volume

31

pub_type

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