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Postnatal development of respiratory function in lambs studied serially between birth and 8 weeks
M G Davey1, D P Johns, R Harding
1Department of Physiology, Monash University, Clayton, Victoria, Australia. m.davey@med.monash.edu.au
Respiration Physiology
|October 17, 1998
Summary
Respiratory function in lambs changes significantly in the first 8 weeks after birth. Pulmonary diffusing capacity increases due to alveolar development, while lung volumes and breathing patterns mature.
Area of Science:
- Physiology
- Neonatal Development
Background:
- Understanding neonatal respiratory development is crucial for identifying potential long-term health issues.
- Previous research has limited serial data on respiratory function in the early postnatal period of lambs.
Purpose of the Study:
- To quantify developmental changes in key respiratory parameters in lambs during the first 8 postnatal weeks.
- To establish a reference dataset for postnatal lung function in sheep.
Main Methods:
- Repeated measurements of respiratory function in 12 pentobarbitone-sedated lambs from 3 days to 8 weeks postnatal.
- Assessment of pulmonary diffusing capacity, lung volumes (Total Lung Capacity, Functional Residual Capacity), respiratory system compliance, and breathing patterns.
Main Results:
- Pulmonary diffusing capacity for CO increased with age, driven by alveolar-capillary membrane diffusion (Dm) and pulmonary capillary blood volume (Vc).
- Total lung capacity and Functional Residual Capacity (FRC) decreased postnatally.
- Static respiratory system compliance initially fell rapidly, primarily due to reduced chest wall compliance.
Conclusions:
- Serial assessment of respiratory function in sedated lambs is feasible using basic methods.
- Postnatal increases in pulmonary diffusing capacity reflect ongoing alveolarization.
- The study provides essential normative data for future research on prenatal influences on postnatal lung function in sheep.