title: An attempt to analyze the relation between hospital surgical volume and clinical outcome.
abstract: OBJECTIVE
  The aim of this study was to investigate the relation between hospital volume and clinical surgical outcome for 10 cardiac, lung, and esophageal surgical procedures.
  
  
  METHODS
  The Committee for Scientific Affairs of the Japanese Association for Thoracic Surgery collected the pooled data on cardiac, lung, and esophageal surgical procedures between 2000 and 2004 from the annual reports. The relation between operative mortality (30-day or in-hospital mortality) and hospital volume was analyzed using a logistic regression model. The surgical procedures studied were surgery for acquired cardiac diseases [coronary artery bypass grafting (CABG), valve procedures, acute type A dissection surgery], total CABG (elective + emergency), elective CABG, emergency CABG, single-valve surgery, acute type A dissection surgery, open heart surgery for the newborn, open heart surgery for the infants, lung cancer surgery, and esophageal cancer surgery. The data used in this study were not risk-adjusted.
  
  
  RESULTS
  The data on the relation between hospital volume and operative mortality generally tended to show an inverse correlation for all 10 cardiac, lung, and esophageal surgical procedures; that is, the higher was the volume the lower was the mortality. However, wide variations in operative mortality were noted among the very-low-volume hospital groups.
  
  
  CONCLUSIONS
  An inverse correlation was noted between hospital volume and operative mortality in the present study, although wide variations in clinical outcome were noted among the very low-volume hospitals. Further analysis is warranted using risk-adjusted data.
authors: First Department of Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Japan. tkazui@hama-med.ac.jp
authors: Teruhisa
authors: T
authors: Kazui
authors: Hiroaki
authors: H
authors: Osada
authors: Hiromasa
authors: H
authors: Fujita
mesh_terms: D000784:Aortic Dissection / Q000401:mortality / Q000601:surgery; D006348:Cardiac Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data; D001026:Coronary Artery Bypass / Q000401:mortality / Q000706:statistics & numerical data; D013505:Digestive System Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data; D017558:Elective Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data; D004632:Emergency Medical Services / Q000706:statistics & numerical data; D004938:Esophageal Neoplasms / Q000401:mortality / Q000601:surgery; D019538:Health Care Surveys; D006351:Heart Valves / Q000601:surgery; D017052:Hospital Mortality; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D008175:Lung Neoplasms / Q000401:mortality / Q000601:surgery; D016017:Odds Ratio; D010043:Outcome and Process Assessment, Health Care / Q000706:statistics & numerical data*; D013510:Pulmonary Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data; D019984:Quality Indicators, Health Care / Q000706:statistics & numerical data*; D018570:Risk Assessment; D013514:Surgical Procedures, Operative / Q000401:mortality* / Q000706:statistics & numerical data*; D013997:Time Factors; D016896:Treatment Outcome; D014656:Vascular Surgical Procedures / Q000401:mortality / Q000706:statistics & numerical data