title: Open access intrapartum CTG database.
abstract: BACKGROUND
  Cardiotocography (CTG) is a monitoring of fetal heart rate and uterine contractions. Since 1960 it is routinely used by obstetricians to assess fetal well-being. Many attempts to introduce methods of automatic signal processing and evaluation have appeared during the last 20 years, however still no significant progress similar to that in the domain of adult heart rate variability, where open access databases are available (e.g. MIT-BIH), is visible. Based on a thorough review of the relevant publications, presented in this paper, the shortcomings of the current state are obvious. A lack of common ground for clinicians and technicians in the field hinders clinically usable progress. Our open access database of digital intrapartum cardiotocographic recordings aims to change that.
  
  
  METHODS
  The intrapartum CTG database consists in total of 552 intrapartum recordings, which were acquired between April 2010 and August 2012 at the obstetrics ward of the University Hospital in Brno, Czech Republic. All recordings were stored in electronic form in the OB TraceVue®;system. The recordings were selected from 9164 intrapartum recordings with clinical as well as technical considerations in mind. All recordings are at most 90 minutes long and start a maximum of 90 minutes before delivery. The time relation of CTG to delivery is known as well as the length of the second stage of labor which does not exceed 30 minutes. The majority of recordings (all but 46 cesarean sections) is - on purpose - from vaginal deliveries. All recordings have available biochemical markers as well as some more general clinical features. Full description of the database and reasoning behind selection of the parameters is presented in the paper.
  
  
  CONCLUSIONS
  A new open-access CTG database is introduced which should give the research community common ground for comparison of results on reasonably large database. We anticipate that after reading the paper, the reader will understand the context of the field from clinical and technical perspectives which will enable him/her to use the database and also understand its limitations.
authors.affiliation: Department of Cybernetics, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic. vaclav.chudacek@fel.cvut.cz.
authors.forename: Václav
authors.initials: V
authors.lastname: Chudáček
authors.forename: Jiří
authors.initials: J
authors.lastname: Spilka
authors.forename: Miroslav
authors.initials: M
authors.lastname: Burša
authors.forename: Petr
authors.initials: P
authors.lastname: Janků
authors.forename: Lukáš
authors.initials: L
authors.lastname: Hruban
authors.forename: Michal
authors.initials: M
authors.lastname: Huptych
authors.forename: Lenka
authors.initials: L
authors.lastname: Lhotská
mesh_terms: D022126:Access to Information; D000137:Acid-Base Imbalance; D000328:Adult; D001034:Apgar Score; D015148:Cardiotocography; D016208:Databases, Factual; D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D005316:Fetal Distress / Q000175:diagnosis; D006340:Heart Rate, Fetal; D006801:Humans; D006863:Hydrogen-Ion Concentration; D036801:Parturition; D011247:Pregnancy; D012815:Signal Processing, Computer-Assisted