Authors' Response

David F. Kallmes, ,
January 19, 2012

We greatly appreciate the input by Dr. Chandra and colleagues. Our paper was a highly focused, empiric exercise to determine, based on morphology alone, the potential for endoluminal implants for treatment of aneurysms. There are myriad additional factors that, without question, will affect the appropriateness of such devices for a given aneurysm, including aneurysm rupture status, patient condition, age, tolerance of antiplatelet agents, vascular access, and others that will become apparent as these devices gain widespread use.

We welcome the comments by Dr. Chandra and colleagues regarding the FDA approval status of the device. Of course, the work performed for that paper was done long before the device was even submitted for FDA approval, and represents a "thought experiment" rather than a clinical trial. We, as they, assume that physicians are capable of reading the package insert to determine the type of aneurysm for which the device was specifically approved. We also assume that, as with many or most devices approved under the Premarket Approval process, actual usage will extend far beyond the "on-label" indication. We genuinely hope that such "off- label" usage will be done in the setting of prospective, controlled studies if at all possible, such studies that in the future might lead to or away from FDA approval for expanded indications.

David F. Kallmes Harry J. Cloft David Fiorella

Conflict of Interest:

None declared

Conflict of Interest

None declared