Cardiotocography (CTG) recording data (IMAGE) University of Helsinki Caption Cardiotocography (CTG) recording data: maternal heart rate on green, fetal heart rate on blue above the maternal heart rate. Credit Mikko Tarvonen Usage Restrictions Can be used when new is related to research article. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.