LUS	Lower Uterine Segment
PDL	Prolonged Dystocic Labor
OPP	Occiput Posterior Position
POPP	Persistent Occiput Posterior Position
OTP	Occiput Transverse Position
A	Asynclitism
IU	Intrapartum Ultrasonography
LNA	Labor Neuraxial Analgesia
CS	Cesarean Section
EN	Enkephalin
CNS	Central Nervous System
PNS	Peripheral Nervous System
OVD	Operative Vaginal Delivery
CSE	Combined Spinal-Epidural
VE	Vaginal Examination
VBAC	Vaginal Birth After Cesarean Section