One transducer records the fetal heart rate using ultrasound and the other transducer monitors the contractions of the uterus by measuring the tension of the maternal abdominal wall (providing an indirect indication of intrauterine pressure).
How do contractions show on monitor?
The monitoring is usually performed in a doctor’s office or hospital. A nurse will wrap a belt around your waist and attach it to a machine called a tocodynamometer. The machine records the frequency and length of your contractions. Your doctor may also recommend monitoring your contractions at home.
Can CTG detect contractions?
What is cardiotocography? Cardiotocography (CTG) measures your baby’s heart rate. At the same time it also monitors the contractions in the womb (uterus). CTG is used both before birth (antenatally) and during labour, to monitor the baby for any signs of distress.
How are contractions detected?
An ultrasound transducer is strapped over your abdomen to pick up the baby’s heartbeat. A second, pressure-sensitive gauge is strapped to the top of your abdomen to record the frequency and power of your contractions. Both detectors are connected to a monitor, and the measurements are recorded on a paper readout.
How many contractions are in a 10 minute CTG?
Uterine contractions – They are quantified as the number of contractions present in a 10 min period and averaged over 30 min. Normal: ≤ 5 contractions in 10 min.
What number is considered a contraction?
Contractions are considered regular when the duration and frequency are stable over a period of time. An example is contractions lasting 60 seconds and coming five minutes apart for an hour.
What do real contractions look like on the monitor?
The monitor records the duration of contractions and the time between them but doesn’t tell you the strength of the contraction. Each contraction resembles a hill or a bell-shaped curve, starting low, rising slowly, and then returning to baseline.
What is abnormal CTG?
An abnormal CTG has two or more features which are non-reassuring, or any abnormal features. Further information about classifying FHR traces: If repeated accelerations are present with reduced variability, the FHR trace should be regarded as reassuring.
How often should CTG be done?
If the pregnancy is risk-free and the CTG performed during early-stage labor was unremarkable, the interval for electronic fetal surveillance intrapartum can range from once every 30 minutes up to a maximum of every two hours (minimum duration of reading at least 30 minutes); if it is not possible to take a reading, …
What does a normal CTG look like?
Normal antenatal CTG trace: The normal antenatal CTG is associated with a low probability of fetal compromise and has the following features: Baseline fetal heart rate (FHR) is between 110-160 bpm • Variability of FHR is between 5-25 bpm • Decelerations are absent or early • Accelerations x2 within 20 minutes.
When do you repeat a contraction stress test?
Requires repeat testing on following day. Presence of contractions that occur more frequently than every 2 minutes or last longer than 90 seconds in the presence of late decelerations. Requires repeat testing on following day.
What are the warning signs of premature labor?
Signs and symptoms of preterm labor include:
- Regular or frequent sensations of abdominal tightening (contractions)
- Constant low, dull backache.
- A sensation of pelvic or lower abdominal pressure.
- Mild abdominal cramps.
- Vaginal spotting or light bleeding.
How do I tell the difference between Braxton Hicks and real contractions?
Braxton Hicks contractions are irregular and infrequent. They usually last about 15 to 30 seconds (but sometimes as long as two minutes), and they should subside when you change positions. Real labor contractions are relatively regular and grow stronger, longer and closer together as you near labor.