Digital Rectal Examination vs Machine Learning-assisted Electrical Impedance Spectroscopy for Obstetric Anal Sphincter Injuries' Detection: a Prospective Cohort Study in Primiparous Women Giving Vaginal Childbirth

The investigator will evaluate the detection rate for Obstetric Anal Sphincter Injuries (OASI) in primiparas having given vaginal childbirth, comparing the sensitivity of methods available in a labour ward setting for rapid detection: standard digital rectal examination (DRE) and Machine Learning-assisted electrical impedance spectroscopy (applied with the ONIRY system). Endoanal Ultrasound (EAUS) is used as the reference standard for diagnosis' confirmation and performed within 12 weeks post-delivery.