The use of analgesic techniques to relieve labour pain is increasingly common. In France, 80% of women benefit from them during obstetric labour (17). Among these techniques, neuraxial analgesia (epidural, spinal anaesthesia and combined spinal-epidural) is considered the most effective (18).
The epidural
An epidural, also known as locoregional analgesia or epidural analgesia, affects only part of the body — namely the lower limbs, the perineum and the abdomen. It involves the injection of an analgesic or an analgesic combination into the epidural space, acting directly on the central nervous system (19).
This medical intervention is widely recognised for its effectiveness in reducing pain during labour. Studies have shown that it can reduce perceived pain by 2 to 3 points on a scale of 0 to 10, offering significant relief (20). Compared with opioids, the epidural also has advantages in terms of reducing nausea, vomiting and breathing difficulties for the mother.
The epidural can, however, make the birth experience more passive. By primarily blocking the sensation of pain, epidural analgesia can affect the motor block capacity of the expectant mother, altering her perception of pain and her muscular activity. Similarly, the maternal-foetal implications of the epidural are the subject of debate regarding the increased incidence of caesarean sections, the higher risk of instrumental vaginal delivery and the prolongation of labour, in addition to the timing at which epidural analgesia is administered.
A small number of situations constitute an absolute or relative contraindication to neuraxial anaesthesia. These include patient refusal, allergy to local anaesthetics, hypovolaemia (reduced blood volume), intracranial hypertension, infection at the puncture site, hyperthermia, haemostatic disorders, neurological conditions, spinal abnormalities, cervical dilation and lumbar tattoos. However, contraindications apply to fewer than 0.5% of women (17).
To find out more, read our article epidural and risk and on giving birth without an epidural.
Other pharmacological techniques
Other pharmacological techniques provide pain relief. These include local peripheral blocks (paracervical around the cervix and pudendal in the pelvis), inhaled analgesia (nitrous oxide and halogenated agents) and intravenous analgesia (opioids and non-opioids) (21).
Nitrous oxide is a low-potency, self-administered inhaled analgesic that has long been used for pain relief during labour (22). Systemic opioids are also used by many women in labour, either to avoid or delay neuraxial analgesia, or when neuraxial analgesia is contraindicated.
Please note that medical pain management is subject to careful assessment and is handled by a qualified healthcare professional.