[Airway management in obstetrics]. / Gestion des voies aériennes en obstétrique.

ABSTRACT

OBJECTIVE: Reviewing problems related to the airway management in obstetrics, taking into account the recent evolutions of the anaesthetic practices in obstetrics. DATA SOURCES A review of the literature in English and French was performed in the Pumed database in April 2010. The first research used the following MeshTerms "Anesthesia, Obstetrical" [Mesh] AND "Intubation, Intratracheal" [Mesh]. Complementary research used alone or in combination the following keywords difficult tracheal intubation; failed tracheal intubation; airway; prediction of difficult tracheal intubation; maternal mortality; maternal morbidity; liability; aspiration pneumonia and obstetrical anesthesia. STUDY SELECTION All the publications were retained excluding the correspondence. DATA EXTRACTION Data analysis for the airway management in obstetrics, the prediction of difficult intubation, the prevention of pulmonary inhalation of gastric fluid, but also on maternal morbi-mortality in link with general anesthesia in obstetrics. DATA SYNTHESIS: Airway management in obstetrics remains a true challenge for various reasons. The physiological and anatomical modifications related to pregnancy are responsible for a faster hypoxemia, a reduction of the diameter of the pharyngolaryngal tract, as well as an increase of the risk of inhalation of gastric contents after 16 weeks of amenorrhea. The emergency or extreme emergency context and the presence of diseases like obesity or preeclampsia raise the risks of difficulties with airway management. The logical evolution of the practices, with the considerable rise of the regional anesthesia/analgesia limits the training and the maintenance of competences for intratracheal intubation in obstetrics. The training per simulation appears particularly interesting on the subject and this approach needs to be developed. The literature indicates that the incidence of difficult intubation is of one per 30. The impossible intubation is one per 280 in obstetrics, eight times greater than in the general population. No criterion of difficult intubation is sufficiently predictive alone. In obstetrics as in other contexts, the association of several criteria will permit to anticipate a difficult intubation. There is a worsening of the Mallampati during the pregnancy and during labour. To limit the risk of a difficult management of the airway in obstetrics, it will be paramount and capital, in addition to give priority to the regional anaesthesia/analgesia each time possible, to perform a careful and repeated evaluation of the predictive criteria of difficult intubation or ventilation. The inhalation of gastric fluid will systematically be prevented. The adapted material and algorithms for difficult intubation must be available in the labour wards. In case of a difficult intubation during an emergency caesarean section, the SFAR algorithms must be applied. In case of a "cannot intubate can ventilate situation", the possibility of carrying on the Caesarean maintaining the Sellick manoeuvre should be considered. The place of the laryngoscopy assisted by videolaryngoscope in this context clearly remains to be defined. Even if in the literature some cases of successful intubation through these devices suggest an interest, there is a clear deviance between the guidelines and the practices concerning general anaesthesia performed at the end of the labour. Indeed they should be systematically performed with rapid sequence induction and tracheal intubation. A reflexion on this theme is necessary in order to grant the practices to the recommendations.