title: Isaac's Sign: a previously undescribed predictor for a successful instrumental vaginal delivery.
authors.affiliation: Heartlands and Solihull NHS Teaching Trust, Birmingham, UK.
authors.forename: A Isaac
authors.initials: AI
authors.lastname: Aziz
authors.forename: C
authors.initials: C
authors.lastname: Griffin
authors.forename: M
authors.initials: M
authors.lastname: Wyldes
mesh_terms: D005113:Extraction, Obstetrical / Q000379:methods*; D005260:Female; D006801:Humans; D007746:Labor Presentation; D007748:Labor Stage, Second / Q000502:physiology*; D010808:Physical Examination; D011247:Pregnancy; D014219:Trial of Labor