Clinical practice of obstetric anesthesia: neuraxial techniques, general anesthesia and maternal safety

INTRODUCTION

Obstetric anesthesia encompasses pain management during labor, anesthesia for operative delivery, and anesthetic support during peripartum emergencies. Its clinical importance is based on the need to provide effective maternal analgesia while preserving maternal physiology, uteroplacental perfusion, fetal well-being, and the ability to respond immediately to hemorrhage, difficult airway, hypertensive crisis, cardiac disease, or fetal compromise.^1,2 Maternal request is considered a sufficient medical indication for labor analgesia, and contemporary practice no longer treats childbirth pain relief as optional or secondary.^3,4

The modern obstetric anesthesia paradigm favors neuraxial blockade whenever feasible. This preference reflects both effectiveness and safety: neuraxial techniques provide superior labor analgesia, can be extended for cesarean delivery, and reduce the need for airway manipulation in a population at increased risk for aspiration and difficult intubation.

Nevertheless, general anesthesia retains an essential role in immediate emergencies and when neuraxial anesthesia is contraindicated, inadequate, or unavailable.⁵

NEURAXIAL ANESTHESIA AS THE PREFERRED STRATEGY

Neuraxial blockade includes epidural, spinal, and combined spinal-epidural techniques. In labor, epidural analgesia is the most flexible approach because medication can be titrated through an indwelling catheter, allowing adjustment of sensory block intensity over time. Modern low-concentration local anesthetic-opioid solutions provide excellent analgesia while limiting motor block, facilitating maternal mobility, pushing, and participation in delivery. Randomized and observational evidence supports that epidural analgesia provides superior pain relief without independently increasing the risk of cesarean delivery.^2,4,6

For cesarean delivery, spinal anesthesia is commonly preferred in elective cases because it is technically efficient, produces rapid onset, and provides dense surgical anesthesia (Figure 1). Combined spinal-epidural anesthesia is useful when rapid onset is desired but procedural duration or maternal risk profile favors the security of an epidural catheter. The main adverse effects of neuraxial techniques include hypotension, pruritus, nausea, postdural puncture headache, and, rarely, high neuraxial block or local anesthetic systemic toxicity. These risks are mitigated by appropriate dosing, left uterine displacement, fluid and vasopressor strategies, pencil-point spinal needles, and vigilant monitoring.^7-10

GENERAL ANESTHESIA IN OBSTETRICS

General anesthesia has declined in routine obstetric practice because neuraxial techniques avoid airway instrumentation and provide safer conditions for most cesarean deliveries. However, general anesthesia remains indispensable when delivery is urgently required and there is no functioning neuraxial catheter, when neuraxial anesthesia is contraindicated by coagulopathy or infection, or when maternal instability prevents regional technique placement. It is particularly relevant in Category 1 cesarean delivery, severe hemorrhage, failed neuraxial block, or immediate fetal compromise.^5,11

The principal risks of obstetric general anesthesia are aspiration, failed intubation, rapid desaturation, accidental awareness, and neonatal respiratory depression from transplacental drug exposure. Rapid sequence induction with aspiration prophylaxis remains the standard when general anesthesia is required. Current evidence favors propofol over thiopental in many settings to reduce accidental awareness, while short-acting opioids and rocuronium may provide hemodynamic stability and acceptable intubating conditions without clearly worsening early neonatal Apgar outcomes when used appropriately.^11-13

Population-level data support the safety advantage of neuraxial anesthesia. In low- and middle-income countries, a meta-analysis found that general anesthesia was associated with higher odds of maternal death and perinatal death compared with neuraxial blockade.¹⁴ These findings do not imply that general anesthesia is inappropriate; rather, they reinforce that it should be reserved for situations in which its speed or necessity outweighs its risks and should be performed by teams prepared for obstetric airway difficulty.

SPECIAL CLINICAL CONSIDERATIONS

Maternal comorbidity modifies anesthetic planning. Obesity increases technical difficulty, airway risk, aspiration risk, and rapid oxygen desaturation; therefore, early epidural placement during labor may reduce the need for emergency general anesthesia. Cardiac disease requires careful control of preload, afterload, heart rate, and sympathetic blockade. In selected high-risk patients, invasive arterial monitoring and slowly titrated epidural dosing may be safer than sudden sympathectomy from a dense single-shot spinal anesthetic.^10,15

Systemic pharmacologic analgesia remains relevant when neuraxial techniques are unavailable or declined, but opioids cross the placenta and may cause dose-dependent neonatal respiratory depression. Multimodal non-opioid adjuncts may reduce opioid exposure, but they do not replace neuraxial analgesia when the goal is effective labor pain control. Obstetric anesthesia also requires preparation for emergencies beyond pain relief, including massive hemorrhage, local anesthetic systemic toxicity, high spinal block, failed intubation, eclampsia, and maternal cardiac arrest. Simulation, standardized protocols, and multidisciplinary communication improve team performance during these events.^12,16

DISCUSSION

The preference for neuraxial anesthesia in obstetrics is based on a convergence of analgesic efficacy, maternal safety, and procedural adaptability. Epidural analgesia can begin as labor pain relief and later be extended for cesarean delivery, reducing the need for urgent general anesthesia. Spinal anesthesia provides reliable operative conditions for scheduled cesarean delivery, while combined spinal-epidural techniques preserve flexibility in patients at risk for prolonged surgery or hemodynamic instability. The role, advantages, and main limitations of each modality are summarized in Table 1.

General anesthesia should not be viewed as obsolete; rather, it is a high-risk but necessary rescue and emergency technique. Its safe use depends on rapid decision-making, airway expertise, aspiration prophylaxis, appropriate induction drugs, neonatal readiness, and clear communication with obstetric and pediatric teams. The greatest safety gains in obstetric anesthesia come from avoiding preventable emergency general anesthesia through early risk identification, timely neuraxial catheter placement, and institutional protocols for obstetric crises.

*Scheduled for repeat cesarean delivery because of hypertensive disease of pregnancy and obesity (BMI 42.4), performed in the sitting position at the L2-L3 level with a 25G Whitacre needle; single-dose regimen of hyperbaric bupivacaine (9 mg) plus fentanyl (25 mcg).

CONCLUSION

Clinical practice in obstetric anesthesia is centered on neuraxial techniques because they provide effective labor analgesia and safe surgical anesthesia for most cesarean deliveries. Epidural analgesia is the preferred method for labor because it is titratable and does not independently increase cesarean delivery risk. Spinal anesthesia predominates for elective cesarean delivery because of its rapid onset and reliability, while combined spinal-epidural anesthesia provides additional flexibility. General anesthesia remains essential for immediate emergencies and selected contraindications to neuraxial blockade, but it carries higher airway and aspiration risks. Optimal outcomes require individualized planning, anticipation of maternal comorbidities, preparation for failed airway and hemorrhage, and multidisciplinary crisis readiness.

Funding: No funding sources

Conflict of interest: None declared

Ethical approval: Not required

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