Meconium aspiration syndrome is a serious condition in which a newborn breathes a mixture of meconium and amniotic fluid into the lungs around the time of delivery.
Alternative NamesMAS; Meconium pneumonitis (inflammation of the lungs)
Causes, incidence, and risk factorsMeconium is the term used for the early feces (stool) passed by a newborn soon after birth, before the baby has started to digest breast milk (or formula).
In some cases, the baby passes stools (meconium) while still inside the uterus. This usually happens when babies are under stress because they are not getting enough blood and oxygen.
Once the meconium has passed into the surrounding amniotic fluid, the baby may breathe meconium into the lungs. This may happen while the baby is still in the uterus, or still covered by amniotic fluid after birth. The meconium can also block the infant's airways right after birth.
This condition is called meconium aspiration. It can cause breathing difficulties due to swelling (inflammation) in the baby's lungs after birth.
Risk factors that may cause stress on the baby before birth include:
Before birth, the fetal monitor may show a slow heart rate. During delivery or at birth, meconium can be seen in the amniotic fluid and on the infant.
The infant may need help with breathing or heartbeat immediately after birth, and therefore may have a low Apgar score.
The health care team will listen to the infant's chest with a stethoscope and may hear abnormal breath sounds, especially coarse, crackly sounds.
A blood gas analysis will show low blood pH (acidic), decreased oxygen, and increased carbon dioxide.
A chest x-ray may show patchy or streaky areas in the infant's lungs.
TreatmentThe delivering obstetrician or midwife should suction the newborn's mouth as soon as the head emerges during delivery.
Further treatment is necessary if the baby is not active and crying immediately after delivery. A tube is placed in the infant's trachea and suction is applied as the endotracheal tube is withdrawn. This procedure may be repeated until meconium is no longer seen in the suction contents.
The infant may be placed in the special care nursery or newborn intensive care unit for close observation. Other treatments may include:
If there have been no signs of fetal distress during pregnancy and the baby is an active full-term newborn, experts do not recommend deep suctioning of the windpipe, because it carries a risk of causing a certain type of pneumonia.
Expectations (prognosis)Meconium aspiration syndrome is a leading cause of severe illness and death in newborns.
In most cases, the outlook is excellent and there are no long-term health effects.
In more severe cases, breathing problems may occur. They generally go away in 2 - 4 days. However, rapid breathing may continue for days.
An infant with severe aspiration who needs a breathing machine may have a more guarded outcome. Lack of oxygen before birth, or from complications of meconium aspiration, may lead to brain damage. The outcome depends on the degree of brain damage.
Meconium aspiration rarely leads to permanent lung damage.
ComplicationsRisk factors should be identified as early as possible. If the mother's water broke at home, she should tell the health care provider whether the fluid was clear or stained with a greenish or brown substance.
Fetal monitoringis started so that any signs of fetal distress can be recognized early. Immediate intervention in the delivery room can sometimes help prevent this condition. Health care providers who are trained in newborn resuscitation should be present.
ReferencesCommittee on Obstetric Practice, American College of Obstetricians and Gynecologists. ACOG Committee Opinion No. 379: Management of delivery of a newborn with meconium-stained amniotic fluid. Obstet Gynecol. 2007;110:739.
ACOG Committee Obstetric Practice. ACOG Committee Opinion Number 346, October 2006: amnioinfusion does not prevent meconium aspiration syndrome. Obstet Gynecol. 2006;108:1053.
Greenough A. Respiratory disorders in the newborn. In: Chernick V, Boat T, Wilmott R, Bush A, eds. Kendig's Disorders of the Respiratory Tract in Children. 7th ed. Philadelphia, Pa: Saunders Elsevier;2006:chap 18.
Meconium aspiration syndrome is a serious condition in which a newborn breathes a mixture of meconium and amniotic fluid into the lungs around the time of delivery.
Alternative NamesMAS; Meconium pneumonitis (inflammation of the lungs)
Causes, incidence, and risk factorsMeconium is the early feces (stool) passed by a newborn soon after birth, before the baby has started to digest breast milk (or formula).
In some cases, the baby passes meconium while still inside the uterus. This usually happens when babies are "under stress" because their supply of blood and oxygen decreases, often due to problems with the placenta.
Once the meconium has passed into the surrounding amniotic fluid, the baby may breathe meconium into the lungs. This may happen while the baby is still in the uterus, or still covered by amniotic fluid after birth. The meconium can also block the infant's airways right after birth.
This condition is called meconium aspiration. It can cause breathing problems due to swelling (inflammation) in the baby's lungs after birth.
Risk factors that may cause stress on the baby before birth include:
Before birth, the fetal monitor may show a slow heart rate. During delivery or at birth, meconium can be seen in the amniotic fluid and on the infant.
The infant may need help with breathing or heartbeat right after birth, and may have a low Apgar score.
The health care team will listen to the infant's chest with a stethoscope and may hear abnormal breath sounds, especially coarse, crackly sounds.
A blood gas analysis will show low (acidic) blood pH, decreased oxygen, and increased carbon dioxide.
A chest x-ray may show patchy or streaky areas in the infant's lungs.
TreatmentA team that is skilled at reviving newborn infants should be at the delivery if meconium staining is found in the amniotic fluid. If the baby is active and crying, no treatment is needed.
If the baby is not active and crying right after delivery, a tube is placed in the infant's trachea and suction is applied as the tube is pulled out. This procedure may be repeated until meconium is no longer seen in the suction contents.
If the baby is not breathing or has a low heart rate, the team will help the baby breathe using a face mask attached to a bag and an oxygen mixture to inflate the baby's lungs.
The infant may be placed in the special care nursery or newborn intensive care unit for close observation. Other treatments may include:
In most cases, the outlook is excellent and there are no long-term health effects.
In more severe cases, breathing problems may occur. They usually go away in 2 - 4 days. However, rapid breathing may continue for several days.
An infant with severe aspiration who needs a breathing machine may have more problems. A lack of oxygen before and right after birth may lead to brain damage. Many problems can develop while the child is using a breathing machine.
Meconium aspiration rarely leads to permanent lung damage.
A serious problem with the blood circulation to and from the legs may occur. This is called persistent pulmonary hypertension of the newborn (PPHN). As a result, the baby may not be able to get enough blood into the lungs and out to the rest of the body.
PreventionRisk factors for this condition should be identified as early as possible. If the mother's water broke at home, she should tell the health care provider whether the fluid was clear or stained with a greenish or brown substance.
Fetal monitoringis started so that any signs of fetal distress can be found early. Immediate intervention in the delivery room can sometimes help prevent this condition. Health care providers who are trained in newborn resuscitation should be present.
ReferencesSingh BS, Clark RH, Powers RJ, Spitzer AR. Meconium aspiration syndrome remains a significant problem in the NICU: outcomes and treatment patterns in term neonates admitted for intensive care during a ten-year period. J Perinatol. 2009;29:497-503.
Kattwinkel J, Perlman JM, et al. Part 15: neonatal resuscitation: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation. 2010;122:S909-S919.
Reviewed ByReview Date: 11/14/2011
Kimberly G. Lee, MD, MSc, IBCLC, Associate Professor of Pediatrics, Division of Neonatology, Medical University of South Carolina, Charleston, SC. Review Provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
what are the nurses intervention for meconium
Urine in the lung of an adult would be very rare, so assuming you mean urine in the lung of an infant or newborn, the term you are looking for would probably be AFA or Amniotic Fluid Aspiration. After the 36th week of pregnancy, the amniotic fluid filling the sac around the fetus is made up mostly of the urine of the fetus. During labor and delivery infants can aspirate or breathe and pull the amniotic fluid into their lungs. This aspiration can lead to respiratory distress or respiratory distress syndrome and lung infections in the newborns. Sometimes the amniotic fluid around the time of delivery also contains meconium which is the digestive excrement of the fetus. Meconium aspiration is also a term used for this, and since the amniotic fluid is mostly urine, there will also be urine that gets into the lungs at the same time. Meconium aspiration can also lead to serious respiratory problems in the newborn.
Meconium is the baby's first bowel movement and it is a thick green tar-like substance. For most babies, meconium is released shortly after they are born. However, some babies release meconium during labor and delivery. When a woman is in labor, her doctor will be able to tell if the baby has had a bowel movement because her amniotic fluid will be stained with meconium. The baby will be monitored very closely for any signs of fetal distress. If meconium is present during labor or birth, the baby can aspirate the meconium or swallow it. Once the baby is born, the doctor will perform suctioning to reduce the amount of meconium that the baby can aspirate. If the baby does inhale the meconium, it can cause Meconium Aspiration Syndrome which can lead to meconium aspiration pneumonia - both can be very serious. As a result, the baby will be closely monitored and may require a stay in the NICU for several days to a few weeks. Treatment may include antibiotics or a ventilator. The doctor will perform chest x rays to make sure the lungs are functioning normally. Babies swallowing meconium is more common than one may think. Ask some friends - chances are pretty good that it's happened to someone you know.
There is a 10% death rate due to complications like aspiration pneumonia, breathing difficulty, and cardiac arrhythmias.
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