Small-dose hyperbaric versus plain bupivacaine during spinal anesthesia for cesarean section

Area of Science:

• Anesthesiology
• Obstetrics

Background:

• Cesarean sections often require spinal anesthesia.
• Hypotension is a common complication during cesarean delivery under spinal anesthesia.
• Optimizing spinal anesthetic techniques is crucial for maternal safety.

Purpose of the Study:

• To compare the efficacy and safety of hyperbaric versus plain bupivacaine combined with sufentanil for combined spinal-epidural anesthesia during cesarean section.
• To evaluate the incidence of hypotension and block characteristics between the two anesthetic preparations.

Main Methods:

• A double-blind, randomized trial involving 98 parturients undergoing cesarean section.
• Patients received either hyperbaric or plain bupivacaine (6.6 mg) with sufentanil (3.3 microg) intrathecally.
• Standardized fluid preloading and hypotension treatment protocols were employed.

Main Results:

• Both groups achieved adequate block height, but hyperbaric bupivacaine resulted in more predictable block spread (P < 0.01).
• The incidence of hypotension (systolic blood pressure <90 mm Hg) was significantly lower in the hyperbaric group (6% vs. 21%, P < 0.05).
• The hyperbaric group required less ephedrine and reported less nausea (P < 0.05).

Conclusions:

• A small intrathecal dose of hyperbaric bupivacaine combined with sufentanil offers a more reliable spinal block for cesarean delivery.
• This technique leads to a reduced incidence of hypotension and nausea compared to plain bupivacaine.
• The findings support the use of hyperbaric bupivacaine for improved outcomes in cesarean section anesthesia.