Do lung recruitment maneuvers decrease gastric mucosal perfusion?

Area of Science:

• Critical Care Medicine
• Respiratory Physiology
• Hemodynamics

Background:

• Acute lung injury (ALI) management often involves lung recruitment maneuvers (LRMs) to improve oxygenation.
• The impact of LRMs on splanchnic circulation, specifically gastric mucosal perfusion, is not fully understood.
• Assessing gastric mucosal perfusion provides insights into organ perfusion during critical illness.

Purpose of the Study:

• To investigate the effects of lung recruitment maneuvers on gastric mucosal perfusion in patients with ALI.
• To evaluate the impact of LRMs on systemic circulation and lung mechanics concurrently.

Main Methods:

• Prospective observational study in a university hospital ICU.
• Fourteen ALI patients underwent three LRMs with transient increases in mean airway pressure.
• Gastric mucosal perfusion, systemic hemodynamics, and lung mechanics were measured before, during, and after LRMs.

Main Results:

• Cardiac index decreased during all LRMs; mean arterial pressure decreased during the highest pressure LRM.
• Gastric mucosal perfusion showed no significant changes during or immediately after LRMs.
• No significant changes in systemic oxygenation or lung mechanics were observed post-LRMs, despite transient improvements in some patients.

Conclusions:

• Lung recruitment maneuvers did not significantly alter gastric mucosal perfusion in ALI patients.
• A trend towards gradual decrease in gastric mucosal perfusion was noted, warranting further investigation.
• LRMs primarily affect systemic hemodynamics without significant detrimental effects on gastric perfusion or lung mechanics in this cohort.