How Frequent is the One-Hour tPA Infusion Interrupted or Delayed?

Tissue plasminogen activator (tPA) requires a one-hour infusion after the bolus. The frequency of delay or interruption of the tPA infusion may be useful in weighing the advantages of Tenecteplase (TNKase, TNK) which does not require an infusion.

Utilizing the Benefits of Stroke Treatment Delivered Using a Mobile Stroke Unit Compared to Standard Management by Emergency Medical Services study database, we calculated the frequency and magnitude of tPA infusion delay or interruption.

Of 497 patients treated with tPA on the Houston Mobile Stroke Unit (MSU), 41 (8.3%) had delay or interruption of the infusion for reasons that did not reflect a side effect of, or contraindication to, tPA. Nine received less than 90% of their calculated dose (median 62%, range 28-88%), and eleven had more than a 10% prolongation of their infusion (median 19 min, range 7-210 min). Six patients (1.2%) had infusion stopped for a valid concern for tPA side effect or contraindication.

Interruption or discontinuation of the tPA infusion occurs in 8% of patients treated on a MSU providing an opportunity for more complete and faster treatment with TNK.