What does a Cardiotocography measure?
Cardiotocography (CTG) is a continuous recording of the fetal heart rate obtained via an ultrasound transducer placed on the mother’s abdomen. CTG is widely used in pregnancy as a method of assessing fetal well‐being, predominantly in pregnancies with increased risk of complications.
What is the Dawes Redman criteria?
Dawes Redman criteria takes into account the standard features of visual assessment such as accelerations, decelerations and basal heart rate, as well as parameters which are difficult or impossible to measure visually, such as STV, sinusoidal rhythm and the number of minutes of high variation.
Which deceleration is considered a normal finding?
There are three basic types of decelerations: early decelerations, late decelerations, and variable decelerations. Early decelerations are generally normal and not concerning.
What is the normal range of CTG baseline?
5.5. 1 FHR parameters and assessment criteria (Table 3)
| Parameter | Baseline rate (bpm) | Range (bpm) |
|---|---|---|
| Normal | 110–160 | ≥ 5 |
| Suspicious | 100–109161–180 | < 5 ≥ 40 minutes> 25 |
| Pathological | < 100> 180sinusoidal3 | < 5 > 90 minutes |
How do you use Cardiotocography?
CTG is most commonly carried out externally. This means that the equipment used to monitor the baby’s heart is placed on the tummy (abdomen) of the mother. An elastic belt is placed around the mother’s abdomen. It has two round, flat plates about the size of a tennis ball which make contact with the skin.
What is Toco reading?
The pressure-sensitive contraction transducer, called a tocodynamometer (toco), measures the tension of the maternal abdominal wall – an indirect measure of the intrauterine pressure.
Are late decelerations normal?
Late decelerations are relatively common and correlate with uteroplacental insufficiency.
How do you read a fetal stress test?
These are beats per minute (bpm), which are measured in increments of 10 with markings every 30 beats. The red indicator on the bottom tracing shows the strength of a contraction, measured in millimeters of mercury (mmHg). 6 The higher the number, the stronger the contraction.