Heparin-binding protein in ventilator-induced lung injury

Area of Science:

• Pulmonary Medicine
• Critical Care Medicine
• Inflammation Research

Background:

• Mechanical ventilation, while life-saving, can induce lung injury through mechanical forces and inflammation.
• Heparin-binding protein (HBP), released by granulocytes, is implicated in increased vascular permeability during trauma and sepsis.
• The role of HBP in ventilator-induced lung injury (VILI) requires further investigation.

Purpose of the Study:

• To investigate HBP levels in bronchoalveolar lavage fluid (BALF) and plasma in a pig model of VILI.
• To assess HBP presence in BALF from healthy volunteers and intubated ICU patients.

Main Methods:

• Pigs were ventilated with high tidal volumes (20 ml/kg) to induce VILI or normal tidal volumes (8 ml/kg) as controls.
• Plasma and BALF samples were collected at multiple time points (0-6 hours).
• HBP levels were measured in BALF from healthy volunteers and intubated ICU patients.

Main Results:

• Plasma HBP levels did not differ between control and VILI groups in pigs.
• BALF HBP levels were significantly higher in the VILI group compared to controls after 6 hours (p=0.02).
• BALF HBP levels were markedly higher in intubated ICU patients (1959 ng/ml) compared to healthy volunteers (0.90 ng/ml) (p<0.001).

Conclusions:

• HBP levels in BALF increase over time in a VILI pig model, unlike plasma levels.
• Elevated BALF HBP in intubated ICU patients suggests a role in lung inflammation, potentially independent of ventilation settings.
• HBP may serve as a biomarker for lung inflammation in critically ill patients.