title: Magnetic mini-mover procedure for pectus excavatum III: safety and efficacy in a Food and Drug Administration-sponsored clinical trial.
abstract: OBJECTIVE
  The magnetic mini-mover procedure (3MP) uses magnetic force to gradually remodel pectus excavatum deformity. A magnet is implanted on the sternum and coupled with an external magnetic brace. Under Investigational Device Exemption and Institutional Review Board approval, we performed a pilot study of safety, probable efficacy, and cost-effectiveness of this new treatment of an orphan disease using an implantable pediatric device.
  
  
  METHODS
  Ten otherwise healthy patients, ages 8 to 14 years, with severe pectus excavatum (pectus severity index [PSI] > 3.5) underwent 3MP treatment (mean, 18.8 ± 2.5 months). Safety was assessed by postimplant and postexplant electrocardiograms and monthly chest x-rays. Efficacy was assessed by change in pectus severity index as measured using pretreatment and posttreatment computed tomographic scan. Cost of 3MP was compared with that of standard procedures.
  
  
  RESULTS
  The 3MP device had no detectable ill effect. Device weld failure or malpositioning required revision in 5 patients. Average wear time was 16 h/d. Pectus severity index improved in patients in the early or mid puberty but not in patients with noncompliant chest walls. Average cost for 3MP was $46,859, compared with $81,206 and $81,022 for Nuss and Ravitch, respectively.
  
  
  CONCLUSIONS
  The 3MP is a safe, cost-effective, outpatient alternative treatment for pectus excavatum that achieves good results for patients in early and midpuberty stages.
authors.affiliation: Department of Surgery, Division of Pediatric Surgery, University of California, San Francisco, San Francisco, CA 94143-0570, USA.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Harrison
authors.forename: Kelly D
authors.initials: KD
authors.lastname: Gonzales
authors.forename: Barbara J
authors.initials: BJ
authors.lastname: Bratton
authors.forename: Darrell
authors.initials: D
authors.lastname: Christensen
authors.forename: Patrick F
authors.initials: PF
authors.lastname: Curran
authors.forename: Richard
authors.initials: R
authors.lastname: Fechter
authors.forename: Shinjiro
authors.initials: S
authors.lastname: Hirose
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D005660:Funnel Chest / Q000145:classification / Q000601:surgery*; D006801:Humans; D059346:Magnets / Q000009:adverse effects; D008297:Male; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000379:methods*; D010865:Pilot Projects; D019736:Prostheses and Implants; D014481:United States; D014486:United States Food and Drug Administration