Spinal Anesthesia Techniques in Obstetric Care

Spinal anaesthesia remains the technique of choice for most caesarean deliveries owing to its rapid onset, reliable sensory and motor block, and superior maternal‐fetal safety profile compared with general anaesthesia. The procedure entails a single injection of local anaesthetic into the subarachnoid space, typically using hyperbaric bupivacaine, which distributes under gravity to achieve an adequate sensory level while preserving respiratory function. The principal haemodynamic challenge is post‐block hypotension resulting from sympathetic blockade and aortocaval compression by the gravid uterus. Contemporary management strategies combine maternal left lateral tilt or wedge positioning, judicious fluid loading, and prophylactic vasopressor therapy to maintain arterial pressure. Adjunctive intrathecal opioids prolong postoperative analgesia and reduce local anaesthetic doses, while advances in continuous non‐invasive monitoring and closed‐loop infusion systems enhance precision in blood pressure control. Global research efforts encompass optimisation of vasopressor selection—particularly mixed α/β‐adrenergic agents—tailored tilt angles to mitigate aortocaval compression, and evaluation of novel adjuvants to balance analgesic efficacy with minimised side effects. Together, these developments underscore a trend towards personalised, resource‐sensitive spinal anaesthesia protocols that uphold safety and patient comfort in diverse obstetric settings.

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Spinal Anesthesia Techniques in Obstetric Care publication trend

The graph below shows the total number of articles in spinal anesthesia techniques in obstetric care across all publications each year (not limited to Nature Index journals).

Technical terms

Spinal anaesthesia: Regional technique involving injection of local anaesthetic into the subarachnoid space to block nerve transmission at the spinal cord level.

Hypotension: A decrease in arterial blood pressure below normal limits, commonly a complication of spinal anaesthesia due to sympathetic blockade.

Vasopressor: A pharmacological agent that constricts blood vessels to elevate systemic vascular resistance and arterial pressure.

Intrathecal injection: Administration of drugs directly into the cerebrospinal fluid within the subarachnoid space.

Hyperbaric bupivacaine: A formulation of bupivacaine with increased density relative to cerebrospinal fluid, allowing gravity-dependent spread of anaesthetic.

Adjuvant: A supplementary drug, such as an opioid, added to local anaesthetic to enhance or prolong its effect.

References

1. Prophylactic intravenous norepinephrine for the prevention of hypotension during spinal anesthesia for elective cesarean section: a systematic review and dose–response meta-analysis of randomized controlled trials. Frontiers in Pharmacology (2023).
2. The Impact of Fentanyl and Morphine on Maternal Hemodynamics in Spinal Anesthesia for Cesarean Section. Pharmaceuticals (2025).
3. The Efficacy and Safety of Norepinephrine and Its Feasibility as a Replacement for Phenylephrine to Manage Maternal Hypotension during Elective Cesarean Delivery under Spinal Anesthesia. BioMed Research International (2018).
4. Efficacy and Safety of Different Norepinephrine Regimens for Prevention of Spinal Hypotension in Cesarean Section: A Randomized Trial. BioMed Research International (2018).
5. Effect of Lateral Tilt Angle on the Volume of the Abdominal Aorta and Inferior Vena Cava in Pregnant and Nonpregnant Women Determined by Magnetic Resonance Imaging. Anesthesiology (2015).