title: Relationship between caseload and morbidity and mortality in pediatric cardiac surgery--a four year experience.
abstract: BACKGROUND
  The mortality rate associated with congenital heart surgery is apparently related to caseload.
  
  
  OBJECTIVE
  To determine whether an increase in caseload over the long term at a single center affects management and outcome in children undergoing cardiac surgery.
  
  
  METHODS
  Data were collected prospectively over a 4 year period from the computerized registry of the hospital's pediatric intensive care unit. Five parameters were analyzed: age at surgery, type of surgery, preventive measures (open chest), surgery-related and other complications (diaphragm paralysis and acute renal failure, respectively), and mortality. The data of a single-type surgery (arterial switch) were analyzed for bypass time and mechanical ventilation on an annual basis.
  
  
  RESULTS
  The age distribution changed over the years, with more children under 1 year of age (20% newborns) undergoing surgery by the fourth year of the study. The caseload increased from 216 in the first year to 330 in the fourth, with a concomitant decrease in mortality rate from 4.9% to 3.2%. The chest was left open in 3.2% of patients in the first year and in 9.2% in the fourth year. The rate of diaphragm paralysis decreased from 6% to 2.4%. Death due to acute renal failure in patients requiring dialysis decreased from more than 80% in the first 2 years to 36% in the last two. These changes show an improvement but failed to reach statistical significance. Regarding the arterial switch operation, there was a significant improvement in pump time and duration of mechanical ventilation.
  
  
  CONCLUSIONS
  The increase in caseload in pediatric cardiac surgery was accompanied by improved management, with a lower complications-related mortality rate. We suggest that for optimal care of children with congenital heart disorders, quality management resources should be concentrated in centers with high caseloads.
authors.affiliation: Pediatric Cardiac Intensive Care Unit, Schneider Children's Medical Center of Israel, Petah Tiqva, Israel. cicu_schneider@clalit.org.il
authors.forename: Ovadia
authors.initials: O
authors.lastname: Dagan
authors.forename: Einat
authors.initials: E
authors.lastname: Birk
authors.forename: Yakov
authors.initials: Y
authors.lastname: Katz
authors.forename: Oscar
authors.initials: O
authors.lastname: Gelber
authors.forename: Bernardo
authors.initials: B
authors.lastname: Vidne
mesh_terms: D017677:Age Distribution; D006348:Cardiac Surgical Procedures / Q000009:adverse effects / Q000401:mortality* / Q000706:statistics & numerical data*; D016507:Cardiology Service, Hospital / Q000706:statistics & numerical data; D006330:Heart Defects, Congenital / Q000401:mortality* / Q000601:surgery*; D017052:Hospital Mortality; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D015278:Intensive Care Units, Pediatric / Q000706:statistics & numerical data; D007557:Israel / Q000453:epidemiology; D017063:Outcome Assessment, Health Care / Q000706:statistics & numerical data; D011183:Postoperative Complications; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data; D013997:Time Factors; D016526:Workload / Q000706:statistics & numerical data*