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Circulation. 1999;100:780-782

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(Circulation. 1999;100:780-782.)
© 1999 American Heart Association, Inc.


Editorial

Late Thrombosis After Radiation

Sitting on a Time Bomb

Ron Waksman, MD

From the Vascular Brachytherapy Institute, Cardiovascular Research Foundation, Washington Cardiology Center, Washington, DC.

Correspondence to Ron Waksman, MD, FACC, Vascular Brachytherapy Institute, Cardiovascular Research Foundation, Washington Cardiology Center, Suite 4B-1, 110 Irving St NW, Washington, DC 20010. E-mail rxw8@mhg.edu


*    Introduction
 
Five years after Condado et al1 first treated human coronary arteries with brachytherapy, there is ongoing clinical investigation into its safety and efficacy in preventing restenosis. As with any novel technique, unexpected complications may dampen early high expectations and result in pessimism and skepticism. However, time, experience, and complete data analysis will determine the reality.

Costa and coworkers2 may be reacting prematurely by reporting a new phenomenon in interventional cardiology entitled "late, sudden thrombosis after PTCA plus radiotherapy." They report 6 (6.6%) of 91 patients who presented with late total occlusion/thrombosis at angiographic follow-up; these patients were enrolled into different radiation protocols using different ß-emitters at different prescribed doses.

Late total occlusion or late thrombosis is a valid concern, especially when associated with acute myocardial infarction (MI). However, can we really draw any conclusion from 6 heterogeneous case reports taken from a small cohort of patients in the absence of a control group? Is this announcement based on too few data, and is it premature?

An editorial based on a Brief Rapid Communication mandates the editorialist to gather additional information, disclose his own insights, and provide the readers (the jury in this case) with as much information as possible.


*    Definition and Nomenclature
 
Acute thrombosis occurs during or early after intervention, and subacute thrombosis occurs within the subsequent 30 days. Both usually present with unstable symptoms and angiographic evidence of thrombus. However, the definition of late thrombosis may be problematic. It may not present with symptoms. It may be detected only when follow-up angiography . . . [Full Text of this Article]




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