Obstetric airway has been recognized as a challenge to anesthesiologists [1–3]. In this issue, Tao et al. reported that unanticipated difficult airway accounted for 0.56 % of all pregnancy-related surgical patients, and that more than 99.9 % of all obstetric patients could be intubated [4]. I believe this report is valuable because it shows an actual ratio of unanticipated difficult airway in parturients in their hospital. However, I write this editorial to express some concerns, because some readers may misread this article to be optimistic. First, it should be noted that Tao et al. report a ratio of unanticipated difficult airway. Hence, there must exist some cases with anticipated difficult airway. It is a great pity, however, that they showed neither number nor ratio of anticipated difficult airways in spite of their careful preoperative or prenatal airway evaluation. The most frequently cited article to discuss the risk of general anesthesia for cesarean section is the one by Hawkins et al. [5] reporting that, during the 1970s and 1980s, 17 women died as a result of general anesthesia for every 1 woman who died of regional anesthesia-related causes. This article has played an important role in building the consensus that general anesthesia should be avoided for cesarean section. Simultaneously, monitors for respiratory status and devices for airway management were developed, contributing to the improved safety of general anesthesia for cesarean section. As a result, the gross number of maternal deaths decreased dramatically. Furthermore, the resulting risk ratio between the two techniques also decreased, to 1.7 [6]. However, some maternal deaths still occur related to anesthesia, and anesthesiologists possibly involved in obstetrics should not be optimistic [7, 8]. Until today, several strategies have been proposed and practiced to avoid general anesthesia for cesarean section. Placement of an epidural catheter for labor analgesia can contribute to the reduction of general anesthesia by offering an epidural anesthesia for urgent cesarean section during delivery. Prenatal anesthetic evaluation and explanation, including a parturient who is not willing to receive an epidural, can also contribute in avoiding, by screening, high-risk parturients for general anesthesia and by encouraging an epidural for their delivery or planned cesarean section. With these efforts, it is reported that the ratio of general anesthesia to cesarean section can be decreased to less than 1 % [9]. Recently, a new strategy to avoid general anesthesia for cesarean section has been proposed by Kinsella et al. [10]. They state that most urgent cesarean sections can be managed by spinal anesthesia, naming this strategy rapid sequence spinal anesthesia (RSS), imitating rapid sequence induction (RSI) for general anesthesia. I believe that Tao’s hospital was also making every effort to avoid general anesthesia for cesarean section; however, it should be noted that the general anesthesia ratio is relatively high in their hospital. And again, it is a pity that they could not show the number of parturients with anticipated difficult airways, and they could not explain how they treated them. On the other hand, it is also important to improve the safety of general anesthesia for cesarean sections as it This comment refers to the article available at doi:10.1007/s00540-012-1338-1.
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Jan 1, 2023
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