Exposure to ionizing radiation in children undergoing Amplatzer device placement to close atrial septal defects

To evaluate exposure to ionizing radiation during Amplatzer device occlusio n, a prospective study was performed to measure surface entrance radiation dose by thermoluminescent dosimetry (TLD), Between June 1998 and April 1999 , dosimetry was carried out on 12 patients with Amplatzer device occlusion of atrial septal defects (n = 10) or Fontan fenestration (n =) and 12 age-m atched patients who underwent diagnostic catherization. TLD chips were plac ed at the posterior (PA) and right lateral (LA) chest wall as well as the t hyroid (TH) and gonadal (GN) regions, The Amplatzer group had a median age of 6.4 yr (2.4-12.4 yr) and a median weight of 23.7 kg (15.6-28.9 kg), whic h were similar (p = NS) to those of the control group, who had a median age of 7.9 yr (3.3-16.2 yr) and a median weight of 29.9 kg (10.6-58.0 kg). Dev ice placement was successful in 11 of 12 patients; one device was removed o wing to partial obstruction of the right-upper pulmonary vein. Fluoroscopy times were also similar in the Amplatzer group (23.5 +/- 2.1 min) and the c ontrol group (16.4 +/- 3.1 min; P = NS). The measured surface entrance dose s of the Amplatzer group was similar (p = NS) to those of the control group in all four regions: PA (4.96 +/- 1.88 vs. 6.07 +/- 2.16 cGy), LA (5.22 +/ - 1.68 vs. 3.13 +/- 1.25 cGy), TH (0.92 +/- 0.14 vs. 0.69 +/- 0.09 cGy), an d GN (0.20 +/- 0.00 vs. 0.22 +/- 0.01 cGy). Fluoroscopy times and measured surface entrance doses of ionizing radiation in patients undergoing Amplatz er device occlusion are similar to those in patients undergoing routine dia gnostic catheterization. Cathet Cardiovasc. Intervent. 51:451-454, 2000. (C ) 2000 Wiley-Liss, Inc.