title: Transcatheter closure of persistent arterial ducts with different types of coils.
abstract: BACKGROUND
  Different types of coils have been designed for transcatheter closure of persistent arterial ducts. We compared the efficacy and safety of three types of coils: Gianturco coils (Cook), Cook detachable coils (Cook), and Duct Occlud devices (pfm).
  
  
  METHODS
  Sixty-three patients underwent coil occlusion of arterial ducts between April 1995 and July 2000. The mean age and weight were 4.8+/-3.4 years and 16.5+/-7.6 kg, respectively. The results and complications of ductal occlusion among the three types of coils were compared. Kaplan-Meier analysis was used to assess reduction in the prevalence of residual shunt with time, and multiple regression analysis was performed to identify predictors of complete occlusion.
  
  
  RESULTS
  Coil occlusion of persistent arterial ducts that measured 2. 2 +/- 0.8 mm was feasible in 90% (57/63) of patients. Gianturco coils were used in 29, Duct Occlud devices in 16, and Cook detachable coils in 12 patients. The prevalence of residual shunt at 24 hours, 6 months, 12 months, and 24 months was 42%, 20%, 18%, and 14%, respectively. The reduction in prevalence of residual shunt with time tended to be greater when Gianturco coils were used (P =. 067). Logistic regression identified the use of Gianturco coils to be a significant predictor of complete ductal occlusion on follow-up (P =.04). Pull-through of coils occurred in 4.8% (3/63) and coil embolization in 6.3% (4/63). There was no association between the type of coil and the risk of embolization (P = 1.00).
  
  
  CONCLUSIONS
  Transcatheter occlusion of small persistent arterial ducts with coils is safe and effective. There is no advantage of detachable coils (Cook detachable coils and Duct Occlud devices) over nondetachable Gianturco coils in reducing the risk of embolization. Our findings are in favor of the inexpensive, but more effective, Gianturco coils for occluding small arterial ducts of 3 mm or less.
authors.affiliation: Division of Pediatric Cardiology, Department of Pediatrics, Grantham Hospital, University of Hong Kong, Hong Kong, People's Republic of China. xfcheung@hkucc.hku.hk
authors.forename: Y
authors.initials: Y
authors.lastname: Cheung
authors.forename: M P
authors.initials: MP
authors.lastname: Leung
authors.forename: K
authors.initials: K
authors.lastname: Chau
mesh_terms: D002404:Catheterization / Q000295:instrumentation*; D002675:Child, Preschool; D004374:Ductus Arteriosus, Patent / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D012044:Regression Analysis