Fetal Delayed Development is a 5 – 10 percentiles lag in the development of the fetus from the expected . It is being determined by the results of ultrasonic fetometry.
Types of delayed development:
- Symmetrical shape – proportional delay of all sizes of the fetus.
- Asymmetric – there is a lag in the development of only the size of the tummy of the fetus
The cause of the symmetric form can be:
- genetic disease of the fetus (aneuplodia – trisomy)
- intrauterine infection (TORCH infection)
- congenital abnormalities of the fetus (neural tube defects, congenital heart defects)
The causes of the asymmetric form of delayed fetuses are:
- Chronic maternal diseases (diabetes mellitus, sickle cell anemia, chronic hypertension, cardiovascular diseases …)
- Placental insufficiency (abnormal development of the placenta)
On the basis of ultrasound fetometry the degree of delay can be determined as follows:
- 2 weeks – 1st degree
- 3–4 weeks — 2nd degree
- more than 4 weeks-3rd degree
When establishing fetus delay development it is necessary to evaluate:
- biophysical profile of the fetus;
It is necessary to carry out ultrasound fetometry (in 7-14 days) and doplerometry (in 3-5 days). In case of positive dynamics — an increase in the size of the fetus, prolongation of pregnancy and delivery at 37 weeks is recommended. In case of negative dynamics, there is no increase in the size of the fetus, deterioration of doplerometry in the mid-cerebral artery of the fetus – early delivery is recommended.