Medical Gases Including Hydrogen Show Promise for Brain Protection

Authors
Journal
Progress in Neurobiology
Year
DOI
10.1016/j.pneurobio.2014.01.001
Study Type
clinical
Peer Reviewed
Yes
Country
China
Health Condition
Stroke
Body System
Nervous System

TL;DR

Scientists have found that several types of medical gases like hydrogen and oxygen can protect brain and nerve cells from damage in lab studies, but doctors aren't using them yet because we don't have enough real-world proof that they actually work in patients. They need to do more human studies to figure out which gases really help and how to use them safely before hospitals can start treating people with them.

Key Finding

Multiple medical gases including hydrogen show significant neuroprotective potential in laboratory and animal models across various types of neural injury, but none have been successfully translated into clinical practice due to insufficient human evidence and conflicting trial results.

Summary

This review examined research on several medical gases—including hydrogen, oxygen, and others—that show promise in protecting brain and nerve cells from injury in laboratory studies. While decades of research suggest these gases could help treat conditions like stroke, brain trauma, and nerve damage, none have been widely adopted in clinical practice yet. The authors found that although different gases work through similar protective mechanisms at the cellular level, there isn't enough reliable human evidence and some studies contradict each other, which has prevented these treatments from moving into regular medical use.

Practical Takeaway

While this review identifies hydrogen among gases with theoretical neuroprotective properties, it emphasizes that the evidence remains largely preclinical (laboratory and animal studies). The authors note that contradictory results and lack of robust human trials are major barriers to clinical use. Anyone interested in hydrogen water should recognize that this review does not provide evidence supporting its use for brain or nerve protection in humans—only that the concept warrants further rigorous clinical investigation.

Abstract

The neuroprotective properties for certain medical gases have been observed for decades, leading to extensive research that has been widely reported and continues to garner interest. Common gases including oxygen, hydrogen, carbon dioxide and nitric oxide, volatile anesthetics such as isoflurane, sevoflurane, halothane, enflurane and desflurane, non-volatile anesthetics such as xenon and nitrous oxide, inert gases such as helium and argon, and even gases classically considered to be toxic (e.g., hydrogen sulfide and carbon monoxide) have all been supported by the evidence alluding to their use as potential neuroprotective agents. A wide range of neural injury types such as ischemic/hemorrhagic, stroke, subarachnoid hemorrhage, traumatic brain injury, perinatal hypoxic–ischemic brain injuries, neurodegenerative disease as well as spinal cord ischemia have been used as platforms for studying the neuroprotective effects of these gases, yet until now, none of the gases has been widely introduced into clinical use specifically for protection against neural injury. Insufficient clinical data together with contradictory paradigms and results further hinders the clinical trials. However, pre-clinical models suggest that despite the various classes of gases and the broad range of injuries to which medical gases confer, protection, several underlying mechanisms for their neuroprotective properties are similar. In this review, we summarize the literature concerning the neuroprotective effect of each gas and its underlying mechanisms, extract common targets reported for the neuroprotective effects of different gases, highlight the conflicting observations from clinical trials and further discuss the possible hindrances impeding clinical applications in order to propose future research perspectives and therapeutic exploitations.