Spinal anesthesia for cesarean section: comparative study between isobaric and hyperbaric bupivacaine associated to...

Area of Science:

• Anesthesiology
• Obstetric Anesthesia
• Pharmacology

Background:

• Bupivacaine preparations (plain or with glucose) are common in clinical practice.
• Local anesthetic spread in cerebrospinal fluid (CSF) determines the upper blockade level.
• Spinal anesthesia is frequently used for Cesarean sections.

Purpose of the Study:

• To compare the efficacy and safety of isobaric versus hyperbaric bupivacaine for spinal anesthesia in patients undergoing Cesarean section.
• To evaluate the onset and characteristics of sensory and motor blocks.
• To assess maternal hemodynamic stability and neonatal outcomes.

Main Methods:

• Prospective, randomized, double-blind study involving 60 patients.
• Two groups received either 0.5% isobaric bupivacaine (12.5 mg) or 0.5% hyperbaric bupivacaine (12.5 mg) with morphine (100 microg) via spinal anesthesia.
• Onset time, sensory and motor block levels, hemodynamic parameters, and Apgar scores were recorded.

Main Results:

• No statistically significant difference in the onset time of sensory block between isobaric and hyperbaric groups.
• Similar motor and sensory block characteristics were observed at 20 minutes post-injection.
• Maternal hemodynamic parameters and neonatal Apgar scores were comparable; however, PACU motor block evaluation showed significant differences.

Conclusions:

• Both 12.5 mg isobaric and hyperbaric bupivacaine, combined with 100 microg morphine for spinal anesthesia in Cesarean sections, are effective.
• The two bupivacaine preparations demonstrate similar clinical profiles in this patient population.