Computerised cardiotocography following vibro-acoustic stimulation.

Area of Science:

• Perinatal medicine
• Fetal monitoring
• Acoustic physiology

Background:

• Fetal heart rate (FHR) monitoring is crucial for assessing fetal well-being.
• Vibro-acoustic stimulation (VAS) is used to elicit fetal responses.
• Understanding the immediate effects of VAS on FHR parameters is important for clinical interpretation.

Purpose of the Study:

• To investigate the acute effects of vibro-acoustic stimulation (VAS) on fetal heart rate (FHR) parameters.
• To analyze changes in mean FHR, FHR variation (overall and short-term), and their temporal patterns following VAS.

Main Methods:

• Prospective study involving 17 pregnant women (34-42 weeks gestation).
• Two 60-minute FHR recordings were performed with a 30-minute interval.
• VAS was applied for 5 seconds at the start of one recording; the other served as control.
• Automated analysis of FHR, tocodynamometry, and maternal perception of fetal movements using System 8000.

Main Results:

• Significant increase in mean FHR observed in the first 10 minutes after VAS compared to control periods.
• Concomitant significant decrease in overall and short-term FHR variation within the first 10 minutes post-VAS (p < 0.05).
• No significant changes in FHR parameters were observed for the full 60-minute period post-VAS.

Conclusions:

• VAS causes a transient increase in mean FHR and a decrease in FHR variation in the immediate 10 minutes post-stimulation.
• These short-term changes in FHR parameters following VAS should be considered during fetal monitoring.
• Further research may explore the clinical implications of these acute FHR responses to VAS.