title: Methodology to ease the construction of a terminology of problems.
abstract: BACKGROUND
  Problem lists summarize an aspect of the patient's medical history and provide an important way to implement entry points for clinical pathways and guideline-oriented care. However, in order to automate processes based on problem lists, the use of controlled vocabularies is required. We developed a methodology to extract a collection of standardized problem-related terms from medical documents entered in free text by physicians.
  
  
  METHODS
  We extracted a corpus of sentences describing problems from a randomized selection of admission notes collected at the University Hospitals of Geneva. Theses sentences underwent manual and automatic normalization processes, and a statistical clustering, in order to build a set of terms.
  
  
  RESULTS
  We obtained 17,805 sentences from 5000 admission notes. We refined them into 1546 terms, 88.6% of which could be related to a relevant problem statement.
  
  
  CONCLUSIONS
  A clinically relevant problems terminology was derived from clinical admission notes in free-text using a few methodical steps with a reasonable investment of human resources. Such an approach will ease the development and the use of problem lists better suited to user needs.
authors.affiliation: CRED, Centre Hospitalier Universitaire de Sherbrooke, Que., Canada. paul.fabry@usherbrooke.ca
authors.forename: Paul
authors.initials: P
authors.lastname: Fabry
authors.forename: Robert
authors.initials: R
authors.lastname: Baud
authors.forename: Patrick
authors.initials: P
authors.lastname: Ruch
authors.forename: Christelle
authors.initials: C
authors.lastname: Despont-Gros
authors.forename: Christian
authors.initials: C
authors.lastname: Lovis
mesh_terms: D008501:Medical Records, Problem-Oriented; D009626:Terminology as Topic