Introduction to Cardiotocography

Posted by e-Medical PPT Wednesday, July 28, 2010
Cardiotocography (CTG) is a recording the fetal heartbeat and the uterine contractions during pregnancy, typically in the third trimester.CTG can be used to identify signs of fetal distress.Recordings are performed by two separate transducers, one for the measurement of the fetal heart rate and a second one for the uterine contractions. Each of the transducers may be either external or internal.External measurement is acheived by strapping the two sensors to the abdominal wall.Internal measurement requires a certain degree of cervical dilatation, as it involves inserting a pressure catheter into the uterine cavity.Cardiotocography is used to monitor several different measures: uterine contractions and four fetal heart rate features - baseline heart rate, variability, accelerations, and decelerations.
Baseline heart rate - Fetal Bradycardia is when Fetal Heart rate is less than 110 for more than ten minutes.And FetalTachycardia is when Fetal Heart rate is greater than 160 for more than ten minutes.It may indicate chorioamnionitis.
Baseline Variability - less than 5 may indicate a loss of fetal autoregulation and more than 25 may indicate hypoxia.
Accelerations - increases in fetal heart rate from the baseline by at least 15 beats per minute, lasting for at least 15 seconds.There Should be 2 every 20 minutes lasting no longer than 2 minutes.
Decelerations - decreases in fetal heart rate from the baseline by at least 15 beats per minute, lasting for at least 15 seconds.

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