Norepinephrine Infusion for Preventing Postspinal Anesthesia Hypotension during Cesarean Delivery: A Randomized...

Area of Science:

• Anesthesiology
• Obstetrics
• Pharmacology

Background:

• Postspinal hypotension is a common complication during cesarean delivery.
• Norepinephrine is a potential prophylactic agent, but optimal dosing is unknown.

Purpose of the Study:

• To compare the efficacy of three norepinephrine infusion rates (0.025, 0.050, and 0.075 μg·kg⁻¹·min⁻¹) for preventing postspinal hypotension during cesarean delivery.

Main Methods:

• A double-blinded, randomized controlled trial was conducted with 284 women undergoing cesarean delivery.
• Patients received norepinephrine infusions at varying rates post-subarachnoid block.
• Postspinal hypotension, defined as systolic blood pressure <80% of baseline, was the primary outcome.

Main Results:

• The 0.050 and 0.075 μg·kg⁻¹·min⁻¹ groups showed significantly lower rates of postspinal hypotension (24.7% and 26.0%) compared to the 0.025 μg·kg⁻¹·min⁻¹ group (42.1%).
• Higher norepinephrine doses were associated with increased systolic blood pressure and decreased heart rate.
• No significant differences were observed in intraoperative hypertension, bradycardia, or neonatal outcomes among the groups.

Conclusions:

• Norepinephrine infusion rates of 0.050 and 0.075 μg·kg⁻¹·min⁻¹ are effective in reducing postspinal hypotension during cesarean delivery.
• These higher doses offer a superior prophylactic effect compared to the 0.025 μg·kg⁻¹·min⁻¹ rate.