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Alternative NamesTTN; Wet lungs - newborns; Retained fetal lung fluid; Transient RDS
Definition Return to top
Transient tachypnea is a respiratory disorder usually seen shortly after delivery in full- or near-term babies.
Causes Return to top
As the baby grows in the womb, the lungs make a special fluid. This fluid fills the developing baby's lungs and helps them grow. When the baby is born at term, chemicals released during labor tell the lungs to stop making this special fluid. The baby's lungs start removing or reabsorbing it.
The first few breaths your baby takes after delivery fill the lungs with air and help to clear most of the remaining lung fluid. Some of the fluid may also clear when the baby's chest is squeezed while passing through the birth canal.
Babies born before 38 weeks gestation may not respond as well to the chemical signals released during labor, and there may be more fluid in the lung at birth.
If you had a cesarean section without being in labor, the chemical signals telling the lung to stop making and start removing lung fluid are not as strong, again leaving more fluid in the lung at the time of birth.
If you have diabetes or received large amounts of pain medications during labor your baby is also at risk of developing TTN.
Symptoms Return to top
Newborns with TTN have respiratory problems soon after birth, usually within 1 - 2 hours.
Exams and Tests Return to top
The mother’s pregnancy and labor history are important to make the diagnosis.
Tests performed on the baby may include:
TTN is usually diagnosed after monitoring your baby for 1-2 days.
Treatment Return to top
Your baby will be given oxygen as needed to maintain an adequate blood oxygen level. Your baby’s oxygen requirement will usually be highest within a few hours after birth and then begin to decrease. Most infants with TTN improve in less than 12-24 hours.
If your baby is breathing very rapidly, feedings may be withheld. Fluids and nutrients will be given through a vein until your baby improves. Your baby may also receive antibiotics until infection is ruled out. Rarely, babies with TTN may have persistent lung problems for as long as 1 week.
Outlook (Prognosis) Return to top
The condition usually goes away completely within 24 - 48 hours after delivery. Babies who have had TTN usually have no further problems associated with the condition, and do not need special care or follow-up other than their routine pediatrician visits.Update Date: 11/27/2007 Updated by: Deirdre O’Reilly, M.D., M.P.H., Neonatologist, Division of Newborn Medicine, Children’s Hospital Boston and Instructor in Pediatrics, Harvard Medical School, Boston, Massachusetts.