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What Is Uterine Atony?

Uterine atony can occur when a woman's uterus muscles lose the ability to contract after birthing a child.
Hard labor may increase the risk of a woman developing uterine atony.
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  • Written By: D. Jeffress
  • Edited By: Bronwyn Harris
  • Last Modified Date: 22 October 2014
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Uterine atony is a condition in which the muscles of a woman's uterus lose their tone and their ability to contract after childbirth. Severe hemorrhaging and low blood pressure can result, presenting a number of additional health problems. Women who spend several hours in labor, deliver large or multiple babies, or have had several pregnancies in the past are at the highest risk of developing this problem. Healthcare professionals usually take precautions to prevent the condition during labor, though complications can still occur. Treatment includes intravenous medications, massage techniques to stimulate contractions, and emergency surgery to stop excessive blood loss.

A woman's uterine muscles usually contract to stop bleeding after the baby and the placenta are delivered. The muscles work to constrict exposed blood vessels, stopping the flow of blood and repairing uterine walls. Uterine atony causes the uterus to relax and stops the muscles from contracting regularly. Unrestricted blood vessels can release huge amounts of blood, leading to severe hemorrhages and hypotension.

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Many different factors can contribute to insufficient muscle contractions. Women who experience long, difficult childbirths can develop the condition due to the overexertion of the muscles. Giving birth to twins or a larger than average baby may cause muscles to stretch beyond their limits, leaving them limp and unable to contract properly. Individuals may also have problems if they have delivered many babies in the past, usually more than four. The condition may also occur due to the numbing effects of anesthesia, a severe infection, or medications that relax muscles as a side effect.

Attending medical professionals and nurses usually try to take preventative measures during childbirth to avert hemorrhaging and uterine atony. A healthcare professional might try to take strain off of the uterine muscles by guiding a baby out with his or her hands. At-risk women are frequently given synthetic oxytocin, a chemical that supplements natural hormones to help the uterus return to normal after giving birth. Doctors and nurses may also try to massage the muscles during delivery to restore proper functioning and promote contractions.

If preventative measures are not effective, healthcare professionals take immediate action to stop blood loss. The muscles are continuously massaged and additional intravenous oxytocin is administered. When uterine atony persists, a woman may need to undergo an emergency surgery. A surgeon can tie off blood vessels to prevent hemorrhaging or perform a hysterectomy, where the entire uterus is removed. In some cases, blood transfusions are necessary to restore healthy levels and blood pressure. Most women are able to recover from their symptoms with immediate treatment, though they are generally placed at a high risk of experiencing future problems with subsequent births.

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Discuss this Article

anon239802
Post 5

This happened to me. It was very scary. I am concerned that in the future I may not be able to have more children. I guess when the time comes I can get an assessment of some sort done by my doctor to determine if this is safe.

anon209947
Post 4

Thanks for the great info. I'm testing on these subjects tomorrow.

FirstViolin
Post 3

Sometimes uterine atony can be caused by pieces of the placenta being left in the uterus.

However, this usually shows up as a failure of the uterus to contract all the way, rather than a failure to contract at all.

googlefanz
Post 2

Besides uterine atony, excessive bleeding after birth can also be caused by placenta previa.

Like that caused by uterine atony, a placenta previa hemorrhage is a serious complication of pregnancy and delivery, and those diagnosed with a placenta previa pregnancy should be ready for a difficult labor.

In some cases, a C-section is necessary.

closerfan12
Post 1

One of the rarer causes of uterine atony is infection.

In these cases, the fetal membrane becomes inflammed because of a bacterial infection known as chorioamnionitis.

This can cause the uterus to fail to contract appropriately, especially as it usually comes in conjunction with long labor.

Unfortunately, though it can be treated, chorioamnionitis is a risk factor for cerebral palsy.

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