Labour is the physiological process by which the fetus, placenta, and membranes are expelled from the uterus through the vagina to the outside world. Clinically, it is defined as painful, regular uterine contractions that increase in frequency and intensity, accompanied by progressive effacement and dilation of the cervix. When this process occurs spontaneously between 37 and 42 completed weeks of gestation, it is termed term labour.
A common misconception in clinical practice is that any uterine tightening or mild discomfort before 37 weeks constitutes true labour; however, Braxton Hicks contractions are irregular, non-progressive, and do not cause cervical change. True labour requires objective evidence of cervical remodeling. Recognizing the distinct boundary between false and true labour prevents premature interventions and unnecessary maternal anxiety.
The exact trigger for human labour remains a complex interplay of endocrine, paracrine, and mechanical factors. As pregnancy reaches term, several physiological shifts occur to transition the uterus from a relaxed, quiescent state to a highly contractile organ.
The passage of the fetus through the pelvis requires precise anatomical adjustments known as the cardinal movements of labour. These mechanical steps allow the irregularly shaped fetal head to navigate the varying diameters of the maternal bony pelvis.
Labour is divided into distinct chronological phases to guide nursing care and medical interventions.
| Stage | Description | Key Nursing Responsibilities |
|---|---|---|
| First Stage | Onset of true labour to full cervical dilation (10 cm) | Monitor contractions, track partograph, assess vital signs, support coping |
| Second Stage | Full cervical dilation to delivery of the infant | Assist with maternal pushing, monitor fetal heart rate, prepare delivery tray |
| Third Stage | Delivery of the infant to delivery of the placenta | Administer uterotonics, inspect placenta for completeness, assess bleeding |
| Fourth Stage | The first one to two hours immediately following placental delivery | Monitor postpartum hemorrhage risk, check uterine tone, promote bonding |
Continuous surveillance ensures maternal safety and detects early signs of fetal compromise. Nurses utilize both physical assessments and technological tools to evaluate progress and well-being.
Maternal observations include regular tracking of blood pressure, pulse, temperature, and urine output. Elevated temperature can indicate maternal infection or chorioamnionitis. Blood pressure monitoring helps identify gestational hypertension disorders.
Fetal well-being is monitored using intermittent auscultation with a Pinard stethoscope or Doppler ultrasound, or via continuous Electronic Fetal Monitoring (EFM). The baseline fetal heart rate normally ranges between 110 and 160 beats per minute. Accelerations signal a healthy, reactive nervous system, while decelerations—especially late or variable decelerations—warn of potential fetal hypoxia requiring immediate clinical action.
Labour pain is severe and multidimensional, combining physical tissue stretching with emotional anxiety. Effective nursing care integrates both non-pharmacological comfort measures and pharmacological options.
Non-pharmacological techniques include continuous one-on-one labour support, maternal mobility, position changes, hydrotherapy, massage, breathing exercises, and sacral counter-pressure. These methods enhance coping and reduce the perception of pain without introducing drug side effects.
Pharmacological relief ranges from systemic opioids, such as pethidine or tramadol, to regional anesthesia like epidural or spinal blocks. Nurses must monitor for side effects such as maternal respiratory depression, hypotension, or urinary retention following regional anesthesia administration.
Even a normally progressing labour can turn into an emergency. Swift identification and team-based intervention save maternal and neonatal lives.