WHAT HAPPENED TO BABY #2???
What is Vanishing Twin Syndrome?
Vanishing Twin Syndrome occurs when one of a set of twin fetuses apparently disappears from the womb during pregnancy, usually resulting in a normal singleton pregnancy.
What really happens?
One of the fetuses in a twin pregnancy spontaneously aborts, usually during the first trimester; the fetal tissue is absorbed by the other twin, the placenta, or the mother, thus giving the appearance that the twin “vanished.”
How is it diagnosed?
Here’s a typical scenario: A mother undergoes a routine ultrasound early in her pregnancy, for example at six or seven weeks gestation.
Two fetuses are detected. The mother is told she is having twins.
When the mother returns to the doctor six weeks later, only one heartbeat can be heard with a Doppler scan. Another ultrasound is performed. Only one fetus is identified.
In other cases, a pregnant mother experiences symptoms that would seem to mimic miscarriage; however the single baby in her womb remains unaffected.
How often does it happen?
Scientists have confirmed that the number of twin conceptions greatly outnumbers the number of actual twin births. Some estimates offer that 1 in 8 people started life as a twin, while in reality only 1 in 70 actually are a twin. In “Having Twins,” author Elizabeth Noble claims that 80% of twin pregnancies result in the loss of one or both babies. Other studies predict that Vanishing Twin Syndrome occurs in 21 - 30% of all multiple pregnancies in the United States. It is estimated that Vanishing Twin Syndrome will play a role in 50% of isted ovulation pregnancies.
Why is it happening more frequently?
Although it would seem that incidences of Vanishing Twin Syndrome are increasing with alarming frequency, it is simply that the detection of the phenomenon has increased. Advancements in ultrasound technology allow modern doctors (and parents) the exciting opportunity to peek into the womb. As more doctors routinely use ultrasound in the first trimester, more multiple pregnancies are identified. And a certain percentage of those will be affected by Vanishing Twin Syndrome. In the past, many women experienced VTS without ever knowing it.
What causes it?
Just as there is no clear attributable cause for most miscarriages, there aren’t always reasons or explanations for the loss of a fetus in a multiple pregnancy. In some cases, the fetus is inviable due to chromosomal or placental abnormalities. Some studies suggest that because these abnormalities are more common in older women, Vanishing Twin Syndrome occurs more often in mothers of advanced age. Vanishing Twin Syndrome occurs with equal frequency in monozygotic and dizygotic twins, although the complications of sharing a placenta between monochorionic monozygotic twins may contribute to the condition.
What are the symptoms?
There might not be any symptoms. However, some mothers experience some mild cramping, bleeding or pelvic discomfort, similar to miscarriage. Decreasing hormone levels may also indicate that one fetus has been resorbed.
What is the treatment?
Generally, neither the mother nor the remaining fetus will require any kind of medical treatment. When VTS occurs in the first trimester, the mother usually goes on to experience a normal pregnancy and delivers a healthy singleton. However, in situations where a fetus dies in the second or third trimester, the mother may experience pre-term labor, infection or hemorrhaging. In those cases, doctors will prescribe treatment appropriate for those conditions.
What are the ramifications for the mother?
Physically, none. But emotionally, the mother may be feeling an awkward combination of grief over the loss of one baby and relief for the viability of the surviving baby. It is important for the parents to grieve in a way that feels appropriate, acknowledging the loss of a child as well as the loss of their identity as parents of multiples.
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