title: [Factors associated with difficult epidural block for obstetric analgesia].
authors.forename: J
authors.initials: J
authors.lastname: García Ferreira
authors.forename: J Fernández-Pacheco
authors.initials: JF
authors.lastname: Jiménez
mesh_terms: D015360:Analgesia, Epidural; D016362:Analgesia, Obstetrical; D015992:Body Mass Index; D002983:Clinical Competence; D003625:Data Collection; D004824:Epidural Space; D005260:Female; D006801:Humans; D009765:Obesity / Q000150:complications; D015588:Observer Variation; D010173:Palpation; D011247:Pregnancy; D011248:Pregnancy Complications; D012044:Regression Analysis; D012107:Research Design; D012307:Risk Factors; D013904:Thoracic Vertebrae / Q000648:ultrastructure