Structural changes in the tracheae of preterm lambs induced by ventilation.

Abstract:

:Compliant immature airways sustain significant deformation following positive pressure ventilation. To evaluate the structural changes induced by in vivo positive pressure ventilation, tracheae of preterm lambs (107-116 d gestational age) were studied histologically. Nonventilated (group I: n = 7) and ventilated (group II: n = 7) tracheal segments were excised and studied by histologic and morphometric techniques. Computerized image analysis was used to measure dimensions of tracheal wall components and of the tracheal section. The circumference, diameter, and cross-sectional area of the section as well as the length of the trachealis muscle were significantly greater; although the thickness of the muscle and cartilage were seen to be significantly lower in group II sections compared to group I sections. Also, in comparison to group I, in group II sections there was lesser overlap of the posterior free ends of tracheal cartilage and the epithelial layer was flattened and focally abraded. Our findings demonstrate structural changes in the airway of preterm animals and characterize alterations in the geometric arrangement of muscle and cartilage after PPV. These results suggest possible structural mechanisms for the functional changes seen during and subsequent to mechanical ventilation.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Deoras KS,Wolfson MR,Bhutani VK,Shaffer TH

doi

10.1203/00006450-198911000-00014

subject

Has Abstract

pub_date

1989-11-01 00:00:00

pages

434-7

issue

5

eissn

0031-3998

issn

1530-0447

journal_volume

26

pub_type

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