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Updated: Aug 15, 2026

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Published on: June 3, 2014
The fibrinolytic enzyme defect of hyaline membrane disease
Abstract:
An investigation of the pulmonary fibrinolytic enzyme system in 31 infants who died with hyaline membrane formation was reviewed. There was complete lack of plasminogen activator activity in the lungs of 84 per cent of these infants. This phenomenon was shown to result from an abnormal inhibitor. A comparable inhibitor was found in normal placental tissue, and it is postulated that this inhibitor is released into the circulating blood as the result of placental infarction. Fibrin, a basic component of the hyaline membrane, is probably precipitated from a physiological capillary transudate associated with the formation of amniotic fluid by the lungs. The presence of an inhibitor of fibrinolysis would then result in the accumulation of intrapulmonary fibrin and the formation of hyaline membranes.
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