Diagnosing antenatal fetal distress

Area of Science:

• Perinatal medicine
• Fetal physiology
• Cardiotocography analysis

Background:

• Fetal neurological development is assessed using acceleration capacity and deceleration capacity.
• Fetal growth restriction (FGR) is associated with decreased phase rectified signal averaging variables.
• Antenatal detection of fetal distress in FGR requires improved diagnostic tools.

Purpose of the Study:

• To evaluate the accuracy of acceleration capacity and deceleration capacity in diagnosing fetal distress.
• To investigate the utility of these parameters in pregnancies complicated by FGR.
• To determine the diagnostic performance of phase rectified signal averaging for fetal distress.

Main Methods:

• A cohort of 124 pregnant women (26-36 weeks gestation) were studied.
• Participants were categorized into appropriate for gestational age fetuses, FGR without distress, and FGR with distress groups.
• Non-invasive fetal electrocardiography was used to obtain fetal cardiosignals.

Main Results:

• Acceleration capacity and deceleration capacity values were lowest in fetuses with FGR and distress.
• A correlation was observed between umbilical artery resistance index and these capacity variables across all groups.
• Phase rectified signal averaging demonstrated high sensitivity and specificity for antenatal fetal distress detection.

Conclusions:

• Fetal acceleration capacity and deceleration capacity represent a prospective method for detecting fetal compromise in FGR.
• These metrics may aid in the early identification of fetal distress during pregnancy.
• The findings support the use of phase rectified signal averaging in managing high-risk pregnancies.