Comparison between conventional-dose and high-dose rocuronium use in general anesthesia for Cesarean section.

Area of Science:

• Anesthesiology
• Obstetric Anesthesia
• Pharmacology

Background:

• Limited studies compare high- vs. low-dose rocuronium in cesarean sections using direct concentration measurements.
• Investigating rocuronium's maternal and fetal blood concentrations and clinical effects is crucial for optimizing obstetric anesthesia.

Purpose of the Study:

• To compare maternal and fetal blood concentrations of rocuronium at high (1.0 mg/kg) and low (0.6 mg/kg) doses during cesarean section.
• To evaluate the clinical effects of these rocuronium doses on maternal and fetal outcomes.

Main Methods:

• Eighteen patients were randomized into two groups: low-dose (0.6 mg/kg) and high-dose (1.0 mg/kg) rocuronium.
• Primary outcome: umbilical vein rocuronium concentration.
• Secondary outcomes: ease of intubation, neuromuscular block duration (TOF), PACU stay, remifentanil dose, maternal rocuronium levels, and Apgar scores.

Main Results:

• No significant differences in demographics, intubation ease, PACU stay, or 1-minute Apgar scores.
• Higher rocuronium concentrations were found in the umbilical vein and maternal circulation in the high-dose group.
• The high-dose group showed a shorter time to T3 disappearance and longer time to T1/T2 reappearance, with lower remifentanil requirements.

Conclusions:

• The 1.0 mg/kg dose of rocuronium did not prolong PACU stay or affect Apgar scores in cesarean section patients.
• Higher rocuronium doses appear safe for both mother and fetus during cesarean delivery, with potential for reduced opioid use.