Increased lung capillary permeability after trauma: a prospective clinical study

Area of Science:

• Pulmonary Medicine
• Trauma Research
• Medical Imaging

Background:

• Severe trauma can lead to pulmonary dysfunction.
• Assessing early changes in lung permeability is crucial for understanding trauma response.
• Traditional methods may not detect subtle, early pulmonary changes.

Purpose of the Study:

• To prospectively investigate pulmonary dysfunction and permeability in severely traumatized patients.
• To compare traditional ventilatory parameters and extravascular lung water with scintigraphic albumin extravasation.
• To determine the timing of pulmonary capillary permeability changes after severe trauma.

Main Methods:

• Prospective study of severely traumatized patients.
• Measurement of ventilatory parameters: PaO2/FiO2, dynamic compliance, per cent shunt, A-a DO2.
• Scintigraphic determination of pulmonary albumin extravasation and extravascular lung water (EVLW).

Main Results:

• Albumin extravasation scintigraphy showed increased pulmonary capillary permeability shortly after trauma (median 3.6 X 10(-5)/sec within 24 hours).
• Eighty percent of patients within 48 hours of trauma exceeded normal albumin extravasation limits.
• Traditional parameters (PaO2/FiO2, compliance, shunt, A-a DO2, EVLW) did not significantly deteriorate until 48 hours post-trauma.

Conclusions:

• Severe multiple trauma induces an early increase in pulmonary capillary permeability.
• Albumin extravasation scintigraphy is a sensitive method for detecting early pulmonary capillary permeability changes after trauma.
• These early permeability changes are not detectable by commonly used clinical measures.