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Lung development in the late preterm
Italian Journal of Pediatrics volume 40, Article number: A24 (2014)
An increasing incidence of moderate-to-late prematurity is observed worldwide (6-7% of all births). Moderate-to-late prematurity is a cause of important mortality and morbidity, even when it is just a few weeks before term gestation . Respiratory issues related to moderate prematurity include delayed neonatal transition to air breathing, respiratory distress resulting from delayed fluid clearance, surfactant deficiency, and pulmonary hypertension. There is increasing evidence to support the hypothesis that preterm delivery, even in the absence of any neonatal respiratory disease, may have adverse effects on subsequent lung growth and development, and that these alterations may persist during the early years of life. Premature birth interrupts normal in utero lung development and results in an early transition from the hypoxic intrauterine environment to a comparatively hyperoxic atmospheric environment . Alveolar walls may be thicker, impairing optimal gas exchange. Colin et al. proposed that preterm birth leads to decreased parenchyma elasticity and subsequent airway tethering, a mechanism by which airway wall compliance keeps surrounding alveoli well opened . The long-term significance of reduced airway function early in life has been emphasized in a longitudinal study involving a large group of non-selected infants who had participated in the Tucson Children’s Respiratory study . In this study Stern et al. showed that infants whose pulmonary function was in the lowest quartile also had pulmonary function in the lowest quartile through the years of follow-up until early adulthood. These findings in a normal unselected population, suggest that the level of pulmonary function in early life tracks and changes little with growth. Several authors suggest that deficits in lung function during early life, especially if associated with lower respiratory illnesses, increase the risk of chronic obstructive pulmonary disease in late adult life [5–7]. Of particular importance in this context may be the role played by RSV, which affects most children during their first year of life. The risk of life-threatening RSV infection appears relevant up to a post-conceptional age of 44 weeks. Stein et al. reported that RSV lower respiratory tract illness during the first 3 years of life in a healthy birth cohort was associated with recurrent wheeze up to age 11 .
In conclusion altered lung development is a characteristic feature of the late preterm infants and its impact on neonatal and postnatal morbidity needs to be considered.
Engle WA, Tomashek KM, Wallman C, Committee on Fetus and Newborn, American Academy of Pediatrics: “Late preterm” infants: a population at risk. Pediatrics. 2007, 120: 1390-1401. 10.1542/peds.2007-2952.
Hartman WR, Smelter DF, Sathish V, Karass M, Kim S, Aravamudan B, Thompson MA, Amrani Y, Pandya HC, Martin RJ, Prakash YS, Pabelick CM: Oxygen dose responsiveness of human fetal airway smooth muscle cells. Am J Physiol Lung Cell Mol Physiol. 2012, 303 (8): 711-719. 10.1152/ajplung.00037.2012.
Colin AA, McEvoy C, Castile RG: Respiratory morbidity and lung function in preterm infants of 32 to 36 weeks’ gestational age. Pediatrics. 2010, 126 (1): 115-128. 10.1542/peds.2009-1381.
Stern DA, Morgan WJ, Wright AL, Guerra S, Martinez FD: Poor airway function in early infancy and lung function by age 22 years: a non-selective longitudinal cohort study. Lancet. 2007, 370 (9589): 758-764. 10.1016/S0140-6736(07)61379-8.
Abe K, Shapiro-Mendoza CK, Hall LR, Satten GA, Weiss ST, Ware JH: Late preterm birth and risk of developing asthma. J Pediatr. 2010, 157 (1): 74-78. 10.1016/j.jpeds.2010.01.008.
Kotecha SJ, Dunstan FD, Kotecha S: Long term respiratory outcomes of late preterm-born infants. Semin Fetal Neonatal Med. 2012, 17 (2): 77-81. 10.1016/j.siny.2012.01.004.
McEvoy C, Venigalla S, Schilling D, Clay N, Spitale P, Nguyen T: Respiratory function in healthy late preterm infants delivered at 33–36 weeks of gestation. J Pediatr. 2013, 162 (3): 464-469. 10.1016/j.jpeds.2012.09.042.
Stein RT, Sherrill D, Morgan WJ, Holberg CJ, Halonen M, Taussig LM, Wright AL, Martinez FD: Respiratory syncytial virus in early life and risk of wheeze and allergy by age 13 years. Lancet. 1999, 354 (9178): 541-545. 10.1016/S0140-6736(98)10321-5.
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Gente, M., Papoff, P., Luciani, S. et al. Lung development in the late preterm. Ital J Pediatr 40, A24 (2014). https://doi.org/10.1186/1824-7288-40-S2-A24
- Chronic Obstructive Pulmonary Disease
- Lung Development
- Late Preterm
- Late Preterm Infant
- Lower Respiratory Illness