Monochorion biamnotic twins - what is it?

Many women, hearing from a doctor on the first ultrasound, "monochorion biamniotic twins" do not know what it is. In order to understand, it is necessary to consider how the classification of a multiple pregnancy is generally classified.

Classification of multiple pregnancies

The most frequently used in the characterization of multiple fetuses is the classification, which takes into account the number of placenta and amniotic membranes.

According to it, there are:

1. Bihorial biamnotic twins - when each fetus has its placenta and amniotic envelope. This double can be either double-diced (each fetus develops from a single egg) and monozygotic (it is observed if the egg division occurs in the first 3 days after fertilization).
2. Monochorion biamniotic pregnancy is observed when each fetus has its amniotic envelope, but there is only one placenta. In this case, twins can only be singleton. A similar pregnancy develops if the period of division of the oocyte occurs from 3 to 8 days.
3. Monochorion monoamniosic twins - when there is only 1 placenta and 1 amniotic membrane, which are common for both fruits. In this case, the septum between the fruits is absent.

How are births with multiple pregnancies?

As a rule, when the monochorion biamniotic twins are born, natural births are not carried out, i. E. the pregnant woman is undergoing elective caesarean section. The thing is that childbirth in the classical way is associated with multiple complications that can occur when children are born. These include:

• weakness of labor activity;
• premature discharge of amniotic fluid;
• prolapse of umbilical cord loops or individual parts of the fetus;
• premature placental abruption;
• a collision of fruits, - when two heads of babies enter the pelvis simultaneously.