Association between lactate concentration in amniotic fluid and dysfunctional labor

Area of Science:

• Obstetrics and Gynecology
• Perinatal Medicine
• Biochemistry

Background:

• Labor dystocia is a significant cause of operative delivery.
• Accurate prediction of dystocia is crucial for timely intervention.
• Amniotic fluid (AF) lactate concentration may serve as a biomarker for fetal distress and labor complications.

Purpose of the Study:

• To investigate the association between high amniotic fluid lactate concentration and labor dystocia.
• To evaluate the diagnostic accuracy of AF lactate levels in predicting dystocia.

Main Methods:

• Prospective observational study conducted in a labor ward.
• Included women in active labor with at least two consecutive AF lactate measurements 60 minutes apart.
• Labor dystocia was defined as instrumental or operative delivery due to dystocia.

Main Results:

• Women with operative delivery due to dystocia had significantly higher mean AF lactate concentrations (10.9 mmol/l) compared to those with spontaneous vaginal delivery (8.9 mmol/l).
• A high AF lactate concentration (>= 10.1 mmol/l) in two consecutive samples predicted operative delivery due to dystocia with 81% sensitivity and 83% specificity.
• Positive and negative predictive values were 86% and 76%, respectively.

Conclusions:

• Elevated amniotic fluid lactate concentration during labor is strongly associated with dystocia.
• This measurement could be a valuable tool for early identification and clinical management of labor dystocia.