Comparison of Echo-assisted ALR Technique and Traditional ALR Technique for the Placement of an Epidural Catheter in the Obstetric Patient

This is a randomized, open-label, single-center clinical trial. The purpose of the study is to understand whether the aid of ultrasound assessment is useful in improving the competence of resident. Specifically, to demonstrate how the aid of echo-assistance in the evaluation of the spine increases the atraumatic success rate (primary objective) and reduces the number of complications (particularly, the number of attempts needed and the rate of dura puncture) (secondary objective) in physicians in specialty training. Pregnant patients requiring peridural analgesia will be assigned to the intervention or control group by simple randomization.