Published online before print October 25, 2004, doi: 10.1161/01.CIR.0000146952.49223.11
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(Circulation. 2004;110:3003-3010.)
© 2004 American Heart Association, Inc.
Arrhythmia/Electrophysiology |
Radiation Exposure During Catheter Ablation of Atrial Fibrillation
From the Division of Cardiology (L.L., C.V., D.B., V.J., Z.E., T.D., D.D., R.B., H.C.) and the Department of Radiology and Radiological Science (M.M., D.K.), The Johns Hopkins Hospital, Baltimore, Md, and the Department of Medicine-Cardiology, University of Bonn, Bonn, Germany (L.L., B.L.).
Correspondence to Mahadevappa Mahesh, MS, PhD, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University, 601 N Caroline St, Baltimore, MD 21287-0856. E-mail mmahesh{at}jhmi.edu
Received March 23, 2004; revision received June 16, 2004; accepted June 17, 2004.
Background— The purpose of this study was to determine the radiation exposure during catheter ablation of atrial fibrillation (AF) using the pulmonary vein (PV) approach.
Methods and Results— The study included 15 patients with AF and 5 patients each with atrial flutter and atrioventricular nodal reentrant tachycardia (AVNRT) who underwent fluoroscopically guided procedures on a biplane x-ray system operated at a low-frame pulsed fluoroscopy (7.5 frames per second). Radiation exposure was measured directly with 50 to 60 thermoluminescent dosimeters (TLDs). Peak skin doses (PSDs), effective radiation doses, and risk of fatal malignancies were all computed. Mean fluoroscopy durations for AF procedures were 67.8±21 minutes in the right anterior oblique (RAO) and 61.9±16.6 minutes in the left anterior oblique (LAO) projection, significantly different from that required for atrial flutter and AVNRT. The mean PSDs measured with the TLDs were 1.0±0.5 Gy in the RAO and 1.5±0.4 Gy in the LAO projection. The lifetime risk of excess fatal malignancies normalized to 60 minutes of fluoroscopy was 0.07% for women and 0.1% for men.
Conclusions— The relatively small amounts of the patient’s radiation exposure in this study, despite the prolonged fluoroscopy durations, can be attributed to the use of very-low-frame pulsed fluoroscopy, the avoidance of magnification, and optimal adjustments of the fluoroscopy exposure rates. The resulting lifetime risk of fatal malignancy is within the range previously reported for standard supraventricular arrhythmias.
Key Words: catheter ablation • radiography • radiation
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