Abiomed Inc. touts the results from the Protect II study of its Impella cardiac assist device, despite halting the trial ahead of schedule.

Over-ambitious doctors seem to have prompted Abiomed Inc. (NSDQ:ABMD) to close down a clinical trial of its flagship cardiac assist device.
The Danvers, Mass.-based company pulled the plug on the Protect II trial of its Impella 2.5 heart pump "based on a futility determination at the planned interim analysis regarding the primary end-point, which the company views as likely to be due to unanticipated confounding variables related to the use of rotational atherectomy," according to a press release.
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