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Electrical impedance measurements: an objective measure of prelabor cervical change
M P O'Connell1, N J Avis, B H Brown
1Coombe Women's Hospital, Dublin, Republic of Ireland.
Objective:
To investigate the use of electrical impedance measurements of the pregnant cervix as an objective measure of cervical favorability (Bishop score > or = 5).
Methods:
A prospective study of 86 women, investigating electrical impedance measurements of the pregnant cervix at the time of induction of labor. Transfer electrical impedance measurements were made by placing a tetrapolar pencil probe of 8 mm in diameter on the surface of the cervix. A Bishop score was determined simultaneously.
Results:
A mean resistivity (standard error of the mean) of 7.03 (6.01-8.04) omega(m) was measured for the unfavorable group and 5.34 (4.61-6.07) omega(m) for the favorable group. This was a statistically significant difference (p = 0.016).
Conclusion:
We highlight the ability of this safe, painless technique to differentiate the favorable from the unfavorable cervix at induction of labor.
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