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Selection criteria for antenatal cardiotocography
Insights
Routine antenatal cardiotocography (CTG) monitoring is crucial for high-risk pregnancies to detect fetal distress early. However, the value of routine CTG in low-risk pregnancies is questionable, suggesting targeted monitoring.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Maternal-Fetal Medicine
Background:
- Antenatal cardiotocography (CTG) is a common tool for fetal surveillance.
- Determining optimal monitoring strategies for different pregnancy risk groups is essential.
Purpose of the Study:
- To evaluate the necessity of routine antenatal CTG monitoring.
- To determine which patient groups benefit most from regular CTG surveillance.
- To analyze the interpretation and classification of antenatal CTG patterns.
Main Methods:
- Prospective monitoring of 812 high-risk pregnancies over 26 months using antenatal CTG.
- Classification of CTG patterns into four grades based on severity.
- Comparison of CTG findings between high-risk and low-risk pregnancy groups.
Main Results:
- 14.5% of monitored patients exhibited pathological CTG changes.
- Abnormal CTG patterns were predominantly observed in the high-risk pregnancy group.
- Patients with essential hypertension and intrauterine growth retardation showed pathological CTGs in 20-30% of cases.
Conclusions:
- Regular, short-interval antenatal CTG monitoring is recommended for high-risk pregnancies to enable early diagnosis of fetal distress.
- The routine use of CTG in low-risk pregnancies warrants further investigation due to limited diagnostic yield.
Abstract:
The present report considers two questions: 1) Which patients should be monitored routinely and 2) the interpretation of antenatal cardiotocography. During 26 months 812 patients with risk pregnancies were monitored with antenatal CTG. Most of them were daily registered. One hundred and seventeen (14.5%) showed pathological CTG changes. The CTG patterns were put into four classes according to the degree of seriousness. A comparison between high risk and low risk pregnancies showed that nearly all abnormal CTGs occurred in the high risk group. Within the high risk group, patients with essential hypertension and intrauterine growth retardation had pathological CTG changes in 20--30%. The study shows that high risk pregnancies should be monitored regularly at short intervals to allow early diagnosis of fetal distress. The value of routine CTG in low risk pregnancy can be questioned.