title: [Computer modeling and simulation of the patient-visit network within a Chilean public health service].
abstract: OBJECTIVE
  To create a computerized model and simulation of the patient visit/ referrals process for a health care services organization within Chile's public health care system.
  
  
  METHODS
  The study was performed with a 'system dynamics' focus. Data were collected from the health care service centers, and a referrals model was created. Specialty areas to be modeled were chosen based on the length of their waiting times. Equations were defined for calculating care visits, referrals, and waiting times. Databases were designed and populated with centers' data. The model was programmed and validated through comparisons with actual data. Scenarios were simulated that would reduce patient waiting time by increasing staff hours or improving diagnostic resolution at the primary care and specialty centers, or both.
  
  
  RESULTS
  The modeling included 22 centers, 1,451 referral flows, and 12 medical specialty areas, in addition to general medicine. A total of 686,869 registered office visits, referrals, and waiting logs were processed. The validation yielded high determinant coefficients and a 10.43% percentage error regarding actual waiting time logs.
  
  
  CONCLUSIONS
  This methodology proved to be useful for modeling a health care network. An auto-referral process was observed where options were available, with opportunities for improvement in diagnostic resolution at the primary health care centers, as well as at the specialty centers. Moderate increases in diagnostic accuracy and office hours would completely eliminate waiting times at the specialty centers.
authors.affiliation: Departamento de Ingeniería Industrial, Universidad de Santiago de Chile, Santiago, Chile, mario.tarride@usach.cl
authors.forename: Mario Iván Tarride
authors.initials: MI
authors.lastname: Fernández
authors.forename: Oscar C
authors.initials: OC
authors.lastname: Vásquez
authors.forename: Julia González
authors.initials: JG
authors.lastname: Martinic
mesh_terms: D002677:Chile; D003198:Computer Simulation; D006298:Health Services Administration; D006801:Humans; D017150:Public Sector