Chances for Survival
What are the chances that my baby will survive?
Many factors determine
an individual baby's chances of survival. The most important of
these are:
- The baby's gestational age (number of completed weeks of
pregnancy) at the time of birth
- The baby's weight
- The presence or absence of breathing problems
- The presence or
absence of congenital abnormalities or malformations
- The presence
or absence of other severe diseases, especially infection
In the
smallest infants, gestational age is usually most important because
it determines if the infant's organs, particularly the
lungs, have
developed enough
to allow the baby to live within the limits of our current technology.
Your baby's doctor will be able to give you the best estimate of your
infant's chances since
he/she can take into consideration many of the above factors.
But, no estimate
is perfect. Some babies suddenly get sick and die unexpectedly;
others defy all odds. General estimates of survival for live
born infants who
receive neonatal intensive care in the USA in the late 1990's are:
Completed Weeks of Gestation at
Birth
(Using last menstrual period)
|
Survival |
21 weeks and less
|
0% |
22 weeks |
0-10%* |
23 weeks |
10-40% |
24 weeks |
40-70% |
25 weeks |
50-80% |
26 weeks |
80-90% |
27 weeks |
>90% |
30 weeks |
>95% |
34 weeks |
>98% |
*Most babies at 22 weeks are not recuscitated because survival without
major
disability is so rare.
A baby's chances for survival increases 3-4% per
day between 23
and 24 weeks of gestation and about 2-3% per day between 24 and 26
weeks of gestation. After 26 weeks the rate of survival increases
at a much slower rate because survival is high already.
What other factors influence survival?
Other factors may influence
survival by altering the rate of organ maturation or by changing
the supply of oxygen to the developing
fetus.
- Rupture of the fetal membranes before 24 weeks of gestation
with loss of amniotic fluid markedly decreases the baby's chances
of survival even if
the baby is delivered much later.
- Male infants are slightly less mature and
have a slightly higher risk of dying than female infants.
- For
a given weight, African-American babies have a slightly better
survival than Caucasian; most other races are intermediate between
the two.
- Diabetes in the mother, if not well controlled, slows
organ maturation and these infants have a higher mortality.
- Severe
high blood pressure before the 8th month of pregnancy may cause
changes in the placenta, decreasing the delivery of nutrients and/or
oxygen to the developing fetus and leading to problems before and after delivery.
Can
my obstetrician do anything to improve my baby's chances of survival?
Yes,
there are things s/he can try if there is enough time and if you
are the appropriate candidate for therapy. Sometimes women
are too
near delivery for
treatments to be effective. Other women have complications
such as infection, fetal distress or bleeding which make a more rapid
delivery
the best
option.
- You may be placed on bedrest.
- Your obstetrician may try to stop
your labor using labor-inhibiting drugs.
- Your obstetrician may
give you a steroid medication such as Betamethasone or Dexamethasone
to try to speed up the baby's lung
development. This is most effective if it is given more than 24 hours before
delivery.
Additional
Information about Survival and Disease
Additional Information about Survival with Extreme Prematurity
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Chances for Disabilty
What are the chances that my baby will have a significant disability
or handicap?
For any infant, IT IS IMPOSSIBLE TO PREDICT AHEAD OF
TIME THE LIKELIHOOD OF A SIGNIFICANT HANDICAP (moderate or severe
mental retardation,
inability to walk without assistance, blindness or deafness). However,
some factors increase the RISK of these handicaps:
- Extreme prematurity,
especially infants of 23-24 weeks of gestation at birth. At these
gestations the risk is about 50%. As gestational age increases,
the chances of being normal or nearly normal increases dramatically and
is similar to the chances for survival. This means if survival
is 80%, then about
80% of
those who survive are free of major disability. Thus, with a 80% survival,
20% will die, about 64% will be healthy and 16% will have major disabilities.
- Identifiable
brain abnormalities. These may occur before birth or in the nursery.
These include large intraventricular
hemorrhages and/or periventricular
leukomalacia.
- Babies who have been the sickest and/or remained sick for
long periods of time (several weeks).
Most children with a significant
disabilities enjoy life and are a source
of pleasure to their parents.
What are the chances that my baby will have a
minor disability?
Minor disabilities occur in about 15% of children
born on time. They occur more often in premature infants, about
half of infants
weighing
less than
3 1/2 pounds
at birth. Many of these are not appreciated until school age.
Common minor disabilities include short attention span; specific
learning
problems in
school such as difficulty
with math or reading; poorer than average coordination, especially
for games requiring eye-hand coordination like hitting a ball;
and needing
glasses
at an early age. Children with minor disabilities usually lead
normal lives. Early
identification of these problems helps make learning easier.
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