title: Transcatheter closure of large patent ductus arteriosus with severe pulmonary arterial hypertension: Short and intermediate term results.
abstract: OBJECTIVE
  To assess the efficacy and safety of transcatheter closure (TCC) of patent ductus arteriosus (PDA) with severe pulmonary arterial hypertension (PHT).
  
  
  BACKGROUND
  TCC of small and moderate-sized PDAs is well established. However, there is a paucity of data on TCC of large PDA with severe PHT.
  
  
  METHODS
  This is a retrospective observational study of 76 patients with large PDA and severe PHT who were referred for TCC. Multiple clinical and investigational parameters were evaluated to decide the reversibility of PHT. Following the TCC, patients were serially followed up to assess the efficacy and safety of closure and its impact on PHT.
  
  
  RESULTS
  Of 76 patients, nine were found to have PDA with Eisenmenger's syndrome. Of remaining 67, two were thought to have irreversible PHT based on hemodynamic data obtained after balloon occlusion of the duct. Sixty five patients, who eventually underwent TCC of PDA, had a median age of 9.1 years (range 1 month to 40 years). The weight ranged between 2.5 to 62 kg (median 14 kg). The PDA size was 9.1 ± 4.6 mm. The mean systolic pulmonary artery pressure was 66.9 ± 15.3 mm Hg. Duct occluder was used in 63 and muscular ventricular septal defect closure device in 2. The follow up was available in 56 (86%) with a mean follow up period of 65 ± 34 months. All the patients had complete closure of the PDA at 6 months follow up. Mild obstruction of left pulmonary artery (n=3) and aortic isthmus flow (n=6) was noted at the time of discharge. During the follow up, partial or complete resolution of PHT was observed in all the patients in whom Doppler-derived right ventricular systolic pressure was recorded (available in 40 of 56 patients).
  
  
  CONCLUSIONS
  TCC of large PDA with severe PHT and significant left to right shunt was found to be effective and safe in the short and intermediate term.
authors.affiliation: Department of Cardiology, King Edward VII Memorial Hospital, Mumbai, Maharashtra, India.
authors.forename: Parag S
authors.initials: PS
authors.lastname: Bhalgat
authors.forename: Robin
authors.initials: R
authors.lastname: Pinto
authors.forename: Bharat V
authors.initials: BV
authors.lastname: Dalvi
keywords: Congenital heart disease; device closure; hemodynamics; pediatric intervention