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Pulmonary surface tension and head injury
The Journal of Trauma
|April 1, 1975
Summary
Head injury in cats significantly increases lung cholesterol, leading to higher surface tension and reduced lung compliance. This suggests cholesterol accumulation is a key factor in head injury-induced lung dysfunction.
Area of Science:
- Pulmonary Physiology
- Trauma Research
- Biochemistry
Background:
- Experimental head injury in monkeys causes decreased lung compliance and high surface tension.
- These changes, without increased lung weight, were mitigated by sympathetic blocking agents.
- Stimulating pulmonary sympathetics also induced similar lung changes.
Purpose of the Study:
- To investigate the effect of lethal mechanical head injury on feline alveolar lining fluid surface tension.
- To identify the underlying reasons for observed changes in surface tension post-head injury.
Main Methods:
- Cats were subjected to lethal mechanical head injury to the occiput.
- Lung wash fluid was analyzed for minimum surface tension and cholesterol content.
- Lung wet/dry weight ratios and gross lung appearance were assessed.
Main Results:
- Lethal head injury resulted in abnormally high minimum surface tension (>20 dynes/cm).
- Cholesterol content in lung wash fluid increased by nearly 200%.
- Lung wet/dry weight ratios and gross lung appearance remained largely unchanged.
Conclusions:
- Increased intra-alveolar cholesterol is strongly suggested as a cause of decreased lung compliance and high surface tension after head injury.
- This finding provides a potential mechanism for head trauma-induced pulmonary dysfunction.