Quick Epidural Top-up with Alkalinized Lidocaine for Emergent Caesarean Delivery

Inclusion Criteria: * Adult patients, affiliated to social security * Informed consent signed by the participant and the investigating physician at the latest after the therapeutic intervention * Initial indication for vaginal delivery * Benefiting from emergency caesarean section during labour for fetal extraction with a maximum 15-minute decision-to-delivery delay (i.e. extremely urgent caesarean section) Exclusion Criteria: * Opposition to participation in research before delivery * Refusal or impossibility of informed consent * Lack of understanding or significant language barrier * Initial indication for general anaesthesia defined by the following situations: non-functional epidural analgesia, altered consciousness, eclampsia, suspicion of amniotic embolism, confirmed or suspected severe haemorrhage occurring before birth * Contraindication to the use of the products defined in the protocol : adrenalized lidocaine ; sodium bicarbonate. * Persons placed under judicial protection