Reasons when a cesarean section is needed

There are many reasons why a health care provider might feel that you need to have a cesarean delivery. Some cesareans occur in critical situations, some are used to prevent critical situations and some are elective.

There are many reasons why a cesarean might be performed in labor. Here are some of the most common ones.

• Failed induction - this may be the cervix fails to dilate in a preset amount of time, or mother or baby become ill from the induction of labor.
• Labor dystocia - labor stalls, can be early or late in labor.
• Fetal distress - where the baby's heart rate is non-reassuring or has developed a pattern of not returning to a normal baseline on the fetal monitoring strip.The most common cause of fetal distress is lack of oxygen to the baby. If fetal monitoring detects a problem with the amount of oxygen that your baby is receiving, then an emergency cesarean may be performed.
• Maternal distress - this may be fever or other problems with the mother.
• Infection of mother or baby.
• Bleeding from the uterus or placenta as in a placental abruption or uterine rupture.
• Cephalopelvic disproportion (CPD) where the pelvis and baby are a supposed mismatch, often termed big baby.
  It is important to note most of these reasons are not emergent and provide you with time to get informed consent and to make a decision.
• Placenta previa: This occurs when the placenta lies low in the uterus and partially or completely covers the cervix. 1 in every 200 pregnant women will experience placenta previa during their third trimester. The treatment involves bed rest and frequent monitoring. If a complete or partial placenta previa has been diagnosed, a cesarean is usually necessary. If a marginal placenta previa has been diagnosed, a vaginal delivery can be an option.
• Placental abruption: This is the separation of the placenta from the uterine lining that usually occurs in the third trimester. Approximately 1% of all pregnant women will experience placental abruption. The mother will experience bleeding from the site of the separation and pain in the uterus. This separation can interfere with oxygen getting to the baby and depending on the severity, an emergency cesarean may be performed.
• Uterine rupture: In approximately 1 in every 1,500 births the uterus tears during pregnancy or labor. This can lead to hemorrhaging in the mother and interfere with the baby's oxygen supply. This is a reason for immediate cesarean.
• Breech position: When dealing with a breech baby, a cesarean delivery is often the only option, although a vaginal delivery can be done under certain circumstances. However, if the baby is in distress or has cord prolapse (which is more common in breech babies) a cesarean is necessary. A cesarean may also be done if the baby is premature.
• Cord prolapse: This situation does not occur often but when it does an emergency cesarean is performed. A cord prolapse occurs when the umbilical cord slips through the cervix and protrudes from the vagina before the baby is born. When the uterus contracts it causes pressure on the umbilical cord which diminishes the blood flow to the baby.
• Fetal distress: Failure to progress in labor: This can occur when the cervix has not dilated completely, labor has slowed down or stopped, or the baby is not in an optimal delivery position. This can be diagnosed correctly once the woman is in the second phase (beyond 5 centimeters dilation), since the first phase of labor (0-4 centimeters dilation) is almost always slow.
• Repeat cesarean: 90% of women who have had a cesarean are candidates for a vaginal birth after cesarean for their next birth (VBAC). The biggest risk involved in a VBAC is uterine rupture, which happens in 0.2-1.5% of VBACs. However, there are criteria you must meet in order to have a VBAC. Consult with your health care provider about your current situation and your options.
• Active genital herpes: If the mother has an active outbreak of genital herpes (diagnosed by a positive culture or actual lesions), a cesarean may be scheduled to prevent the baby from being exposed to the virus while passing through the birth canal.
• Diabetes: If you develop gestational diabetes during your pregnancy or are diabetic, you may have a large baby or other complications. This increases your chance of having a cesarean.
• Preeclampsia: Preeclampsia is a condition of high blood pressure during pregnancy. This condition could prevent the placenta from getting the proper amount of blood needed and decrease oxygen flow to the baby. Delivery is sometimes recommended as a treatment for this condition. Only with severe preeclampsia is a cesarean needed.
• Birth defects: If a baby has been diagnosed with a birth defect, a cesarean may be done to help reduce any further complications during delivery.
• Multiple births: Twins may be delivered vaginally depending on their positions, estimated weights and gestational age. Multiples of three or more are less likely to be delivered vaginally.