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J Am Coll Cardiol, 2000; 36:65-68
© 2000 by the American College of Cardiology Foundation
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CLINICAL STUDIES: INTERVENTIONAL CARDIOLOGY

Late total occlusion after intracoronary brachytherapy for patients with in-stent restenosis

Ron Waksman, MD, FACCa,1, Balram Bhargava, MD, DMa, Gary S. Mintz, MD, FACCa, Roxana Mehran, MD, FACCa, Alexandra J. Lansky, MD, FACCa, Lowell F. Satler, MD, FACCa, Augusto D. Pichard, MD, FACCa, Kenneth M. Kent, MD, FACCa and Martin B. Leon, MD, FACCa

a Cardiac Catheterization Laboratories, Washington Hospital Center, Washington, D.C., USA

Manuscript received September 22, 1999; revised manuscript received January 17, 2000, accepted March 2, 2000.

Reprint requests and correspondence: Dr. Ron Waksman, Vascular Brachytherapy Institute, Cardiovascular Research Institute, Washington Cardiology Center, Suite 4B-1, 110 Irving Street, NW, Washington, D.C. 20010
RXW8{at}mhg.edu

OBJECTIVES

The study sought to determine the incidence and predictors of late total occlusion (LTO, >30 days) in-patients with in-stent restenosis who were treated with intracoronary radiation.

BACKGROUND

Intracoronary radiation both with beta and gamma emitters has been shown to reduce recurrent in-stent restenosis.

METHODS

We reviewed the records of 473 patients who presented with in-stent restenosis and who were enrolled in various radiation protocols, whether randomized to placebo versus radiation or entered into registries. There were 165 placebo and 308 radiated patients, including both gamma and beta emitters. Maximum dose to the vessel wall was 30 to 55 Gy. Following radiation, all patients received antiplatelet therapy with aspirin and either ticlopidine or clopidogrel for one month. All patients completed at least six months of angiographic follow-up.

RESULTS

The LTO was documented in 28 patients (9.1%) from the irradiated group versus 2 placebo patients (1.2%), p < 0.0001. The LTO rates were similar across studies and emitters. In the irradiated group, LTO presented as acute myocardial infarction in 12 patients (43%), unstable angina in 14 (50%), and asymptotic in 2 (7%). Mean time to LTO was 5.4 ± 3.2 months in the irradiated group versus 4.5 ± 2.1 in placebo patients (p = NS). The overall rate of restenting for the entire study group at the time of radiation was 48.6%. Importantly, new stents were placed in 82% of the irradiated and in 100% of the placebo patients who presented with LTO. Multivariate analysis determined that new stenting was the main predictor of LTO.

CONCLUSIONS

Intracoronary radiation for patients with in-stent restenosis is associated with a high rate of LTO. Restenting may contribute late thrombosis. Prolonged antiplatelet therapy (up to six months) should be considered for these patients.

Abbreviations and Acronyms
  ACT = activated clotting time
  DS = diameter stenosis
  LTO = late total occlusion
  MI = myocardial infarction
  MLD = minimal lumen diameter
  PTCA = percutaneous transluminal coronary angioplasty
  QCA = quantitative coronary angiographic
  WRIST = Washington Radiation for In-Stent restenosis Trial




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