Question
After birth, newborns may exhibit symptoms such as cyanosis and restlessness. Upon diagnosis, it is found to be wet lung. What are the causes of neonatal wet lung?
Answer
The causes of neonatal wet lung are usually related to excessive accumulation of pulmonary fluid in the fetal alveoli. During normal delivery, as the fetus passes through the birth canal, the chest cavity is compressed, approximately half to two-thirds of the pulmonary fluid is squeezed out. After the newborn begins to breathe, air enters the alveoli, and the remaining pulmonary fluid is absorbed by the capillaries in the alveolar wall. If there is an excessive amount of fluid in the alveoli and interstitium, a delayed absorption process, or difficulty in fluid circulation, it may lead to the occurrence of wet lung.