| ANS | Autonomous Nervous System |
| LUS | Lower Uterine Segment |
| IU | Intrapartum Ultrasonography |
| chNs | Catecholaminergic Neurotransmitters |
| A | Adrenaline |
| N | Noradrenaline |
| SEM | Scanning Electronic Microscopy |
| PL | Prolonged Labor |
| DPL | Dystocic Prolonged Labor |
| OPP | Occiput Posterior Position |
| VE | Vaginal Examination |
| OTP | Occiput Transverse Position |
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