Acute complications of catheter therapy for congenital heart disease.

Although therapeutic catheter procedures for congenital heart disease are still developing, the number of procedures being performed allows statistically relevant review of the acute complications. Between January 1, 1984, and February 1, 1987, 417 such procedures were performed at The Children's Hospital, Boston; the age range of the patients was 1 day to 51 years (median 4 years, 6 months). Catheter procedures consisted predominantly of vascular dilations (peripheral pulmonic stenosis, 97; valvular pulmonic stenosis, 67; valvular aortic stenosis, 62; recurrent coarctation, 49) and embolizations (double umbrella device, 36; steel coils, 45). Overall, there were 50 acute complications (12%); 24 (6%) were major and 26 (6%) were minor. The mortality rate was 3 of 417 (0.7%). Complication rates varied between 4% for dilation of recurrent coarctation and 40% for dilation of aortic stenosis. The age of the patients was a factor in complications of vascular access (11 patients), 8 of which occurred in patients younger than 6 months (median 5), and in cardiac arrest and ventricular fibrillation (4 patients, 3 of whom were younger than 6 months [median 3]). No statistically significant trend toward diminishing overall complication rates was discerned over the 37 months of this study.