In a promising preclinical study, U.S.-based Respirogen researchers injected billions of tiny oxygen microbubbles into the rectums of pigs with smoke-induced lung damage. The objective: to explore a novel alternative to mechanical ventilation for critically ill patients.
While pigs have been used in ethically controversial experiments like the 2019 pig-monkey hybrids, this research offers a less provocative yet innovative approach. Detailed in a December 9, 2021, BioRxiv preprint, the Colorado company's collaboration with medical experts tested the technique on smoke-exposed pigs. Results showed significant rises in blood oxygen levels and reductions in carbon dioxide.
Respirogen aims to refine and commercialize this method as a bridge therapy to elevate patient oxygen saturation, potentially delaying or avoiding ventilators. Tests lasted hours, but the team believes it could sustain benefits longer-term.
Oxygen was encapsulated in micrometric lipid microbubbles, originally developed in the 1990s by team member Mark Borden to enhance ultrasound imaging. These bubbles maximize oxygen transfer through the colon's vast surface area, outperforming gaseous oxygen delivery.
Twelve pigs weighing 40-50 kg participated. After smoke exposure dropped blood oxygen saturation to as low as 66%, it rebounded to 81% within 2.5 hours post-injection. Declining CO2 levels further indicated improved respiratory function, countering mental fog from hypercapnia.
Though ambitious, approach these findings cautiously: this is a preprint pending peer review. The researchers plan human trials for validation.
