title: Pre-Fontan cardiac magnetic resonance predicts post-Fontan length of stay and avoids ionizing radiation.
abstract: OBJECTIVE
  Patients frequently undergo cardiac catheterization before the Fontan operation because of the limited echocardiographic windows in the region of the superior cavopulmonary connection and branch pulmonary arteries. Patients with obstruction to pulmonary blood flow are at increased risk for prolonged length of hospital stay after the Fontan operation. Cardiac magnetic resonance has unlimited imaging windows and can quantify both the branch pulmonary artery size and net flow distribution and thereby serve as a method for identifying patients at increased risk for prolonged length of stay.
  
  
  METHODS
  We retrospectively reviewed 24 cardiac magnetic resonance studies of patients (mean age, 3.1 +/- 1.0 years) referred before the Fontan operation. Cardiac magnetic resonance measured the cross-sectional area and flow to each branch pulmonary artery. Post-Fontan hospital course data were acquired from the medical record.
  
  
  RESULTS
  Prolonged length of stay after the Fontan operation is observed among patients with one branch that is less than 25% of the total cross-sectional area (18.0 +/- 5.5 vs 8.2 +/- 3.8 days, P = .01) or with less than 40% flow to one branch (12.5 +/- 6.9 vs 7.6 +/- 1.5 days, P = .04). There is moderate correlation between the total branch pulmonary area and length of stay (r = -0.75).
  
  
  CONCLUSIONS
  Cardiac magnetic resonance noninvasively assesses the branch pulmonary area size and flow before the Fontan operation. These data predict which patients are more likely to experience a prolonged hospital course.
authors: Division of Cardiology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA. harrismat@email.chop.edu
authors: Matthew A
authors: MA
authors: Harris
authors: Michael T
authors: MT
authors: Cosulich
authors: Matthew J
authors: MJ
authors: Gillespie
authors: Kevin K
authors: KK
authors: Whitehead
authors: Timothy I
authors: TI
authors: Liu
authors: Paul M
authors: PM
authors: Weinberg
authors: Mark A
authors: MA
authors: Fogel
mesh_terms: D001021:Aortic Valve / Q000473:pathology / Q000503:physiopathology; D001783:Blood Flow Velocity; D002302:Cardiac Output; D002675:Child, Preschool; D005260:Female; D018729:Fontan Procedure; D006801:Humans; D007223:Infant; D007902:Length of Stay; D008279:Magnetic Resonance Imaging; D019028:Magnetic Resonance Imaging, Cine; D008297:Male; D011651:Pulmonary Artery / Q000473:pathology; D013318:Stroke Volume