June 16, 2011
Fetal Electrocardiogram Helps In Early Detection Of Neonatal Acidosis
Researchers at the University of Granada have proved that this method helps to reduce caesarean rate in women in labour with cardiotocographic recordings (CTG) compatible with the risk of loss of fetal wellbeing, and presents more advantages than pulse oximetry. This study was conducted with 180 women in labour who were admitted to the dilation area of the University Hospital Virgen de las Nieves in Granada, Spain.
University of Granada researchers have proved that fetal electrocardiogram (ECG) is the best method for detecting early acidosis and the risk of loss of fetal wellbeing. This method allows to have healthy fetuses, since it shows the effects of lack of oxygen in the heart and brain of the fetus. A study conducted at the University of Granada has proved that this system is better than pulse oximetry, which measures oxygen saturation in fetuses and allows to estimate risks to the fetus.This study was carried out by Mercedes Valverde Pareja, a researcher at the Department of Gynecology and Obstetrics at the University of Granada, and conducted by professors Alberto Puertas Prieto, Alberto Salamanca Ballesteros and Francisco Montoya Ventoso. To carry out this study, its authors conducted a prospective randomized study with 180 women in labour admitted to the dilation area of the University Hospital Virgen de las Nieves, Granada, Spain.
Researchers found that women in labour monitored with fetal ECG and with recorded CTG compatible with risk of loss of fetal wellbeing, recorded a lower cesarean rate (30% vs. 46.7%), obtained better fetal Apgar test results and better values in fetal umbilical cord gas analysis at birth than those recorded with pulse oximetry. They also observed greater real-time monitoring, adequate signal, fetal ECG providing more continuous information, thus helping the obstetrician to control the state of the fetus.
Advantages of the method
This study proved that fetal electrocardiogram is very useful to detect fetuses at risk of suffering acidosis. Once the risk is detected, the delivery is expedited before the fetus shows signs of acidosis and is affected. Moreover, this technique allows the detection of false RCTG positives.
To date, both methods of intrapartum fetal monitoring had been analysed separately (fetal pulse oximetry and fetal electrocardiogram), but there were no previous studies comparing them to each other to assess which one is more effective in detecting risk of loss of fetal welfare.
As Mercedes Valverde explains, "some people believe that both methods are equally effective and that they can be used in the same cases. With this work, we found that their effectiveness is not the same, as they operate at different levels of fetal physiology and therefore give some very precise data. Furthermore, if compared, fetal electrocardiogram (ECG-fetal) detects acidosis at an earlier stage, thus allowing to have healthy fetuses. "
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