Factors adversely affecting lung growth

A Greenough1

  • 1Dept of Child Health, King's College Hospital, London SE5 9RS, UK.

Insights

Impaired fetal lung growth, often diagnosed antenatally, can lead to infant respiratory issues. Postnatal factors like premature birth and smoking also impact lung function, requiring careful management.

Area of Science:

  • Pediatric Pulmonology
  • Fetal Development
  • Neonatal Respiratory Medicine

Background:

  • Antenatal factors like compression and reduced amniotic fluid impair fetal lung growth.
  • Postnatal factors such as passive smoking and premature delivery complicate infant lung function.
  • Pulmonary hypoplasia diagnosis involves high ventilation pressures without significant lung disease.

Purpose of the Study:

  • To review factors affecting antenatal lung growth and postnatal lung function.
  • To discuss diagnostic approaches for pulmonary hypoplasia.
  • To explore antenatal therapeutic interventions and their unproven efficacy.

Main Methods:

  • Review of literature on factors influencing lung development and function.
  • Discussion of diagnostic criteria for pulmonary hypoplasia.
  • Analysis of antenatal interventions and their clinical evidence.

Main Results:

  • Conditions like compression and reduced amniotic fluid adversely affect antenatal lung growth.
  • Premature delivery and passive smoking are key postnatal factors for abnormal lung function.
  • Antenatal therapies for lung compression lack proven efficacy in randomized trials.

Conclusions:

  • Pulmonary hypoplasia presents challenges in both antenatal diagnosis and postnatal management.
  • Infants with impaired lung growth face risks of respiratory symptoms, functional abnormalities, and high mortality.
  • Further research is needed to validate antenatal interventions for improving lung development.

Related Concept Videos

Nature and Nurture01:10

Nature and Nurture

Many human characteristics, like height, are shaped by both nature—in other words, by our genes—and by nurture, or our environment. For example, chronic stress during childhood inhibits the production of growth hormones and consequently reduces bone growth and height. Scientists estimate that 70-90% of variation in height is due to genetic differences among individuals, and 10-30% of variation in height is due to differences in the environments that individuals experience, such as differences...
Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...