Systemic oxygen delivery by peritoneal perfusion of oxygen microbubbles

Area of Science:

• Biomedical Engineering
• Critical Care Medicine
• Respiratory Physiology

Background:

• Severe hypoxemia refractory to mechanical ventilation is a life-threatening condition in critically ill patients.
• Peritoneal ventilation offers a potentially safer alternative to extracorporeal circuits for extrapulmonary oxygenation.
• Previous attempts at peritoneal oxygenation failed due to limited oxygen mass transfer.

Purpose of the Study:

• To develop an effective oxygen formulation for peritoneal ventilation.
• To overcome the limitations of oxygen mass transfer in the peritoneal cavity.
• To evaluate the safety and efficacy of phospholipid-coated oxygen microbubbles (OMBs) for peritoneal oxygenation.

Main Methods:

• Development of phospholipid-coated oxygen microbubbles (OMBs).
• Administration of OMBs via peritoneal ventilation in a rat model of acute lung trauma.
• Comparison of survival rates, hemoglobin saturation, and heart rate against control groups (untreated and oxygenated saline).

Main Results:

• 100% survival rate in rats treated with OMBs for 2 hours, compared to rapid mortality in control groups.
• Normal hemoglobin saturation and heart rate maintained in OMB-treated rats.
• Peritoneal oxygenation with OMBs demonstrated safety and efficacy.

Conclusions:

• Phospholipid-coated OMBs represent a breakthrough in peritoneal oxygenation for severe hypoxemia.
• This method is safer, requires less equipment, and less technical expertise than extracorporeal circuits.
• Peritoneal oxygenation with OMBs holds promise for treating acute respiratory distress syndrome from various causes.