Neonatal electrolyte response to amnioinfusion with lactated Ringer's solution vs. normal saline. A prospective study

Area of Science:

• Obstetrics and Gynecology
• Neonatal Medicine
• Perinatal Research

Background:

• Amnioinfusion is a procedure used during labor to increase amniotic fluid volume.
• Previous studies, primarily in animal models, suggested potential risks of electrolyte imbalance with certain amnioinfusion solutions.

Purpose of the Study:

• To investigate whether amnioinfusion using normal saline or lactated Ringer's solution leads to electrolyte imbalances in human neonates.
• To compare the safety profiles of normal saline and lactated Ringer's solution for amnioinfusion in terms of neonatal electrolyte balance.

Main Methods:

• A prospective randomized study involving parturients undergoing amnioinfusion during the active phase of labor.
• Participants were randomized to receive either normal saline (n=37) or lactated Ringer's solution (n=30).
• Maternal and neonatal cord blood electrolytes were analyzed to assess for imbalances.

Main Results:

• No significant differences were observed between the groups regarding maternal demographics, gestational age, or pre-infusion maternal electrolytes.
• Neonatal chloride concentrations were virtually identical between the normal saline and lactated Ringer's solution groups (P = 1.0).
• Other neonatal electrolyte levels also showed no significant differences based on the crystalloid solution used for amnioinfusion.

Conclusions:

• Amnioinfusion with normal saline is safe and not associated with hyperchloremia or other electrolyte disturbances in human neonates.
• Findings contrast with observations in fetal sheep models, highlighting species-specific responses.
• This study supports the use of normal saline for amnioinfusion without concerns for neonatal electrolyte imbalance.