Inhaled Gases as Therapies for Post-Cardiac Arrest Syndrome: A Narrative Review of Recent Developments
- Authors
- Kei Hayashida, Santiago J. Miyara, Koichiro Shinozaki, Ryosuke Takegawa, Tai Yin, Daniel M. Rolston, Rishabh C. Choudhary, Sara Guevara, Ernesto P. Molmenti, Lance B. Becker
- Journal
- Frontiers in Medicine
- Year
- 2021
- DOI
- 10.3389/fmed.2020.586229
- Study Type
- clinical
- Peer Reviewed
- Yes
- Country
- United States
- Health Condition
- Post-cardiac arrest syndrome (PCAS)
- Body System
- Cardiovascular system
TL;DR
When someone's heart stops and they're brought back to life, their brain can still get seriously damaged from the lack of oxygen. Scientists found that breathing in certain special gases like hydrogen, nitric oxide, and xenon can help protect the brain and reduce this damage, which could help more people survive cardiac arrest without permanent brain injury.
Key Finding
Inhaled molecular hydrogen, nitric oxide, and xenon show cytoprotective effects against post-cardiac arrest complications through multiple mechanisms including reduction of oxidative stress and preservation of mitochondrial function.
Summary
This review examined how inhaled gases—including molecular hydrogen, nitric oxide, and xenon—might help treat complications that occur after cardiac arrest and resuscitation. When the heart stops, the brain and body don't get oxygen, and when blood flow is restored, it can cause additional damage through a process called reperfusion injury. The review found that these gases appear to protect cells by reducing harmful oxidative stress (cellular damage from unstable molecules), decreasing inflammation, and helping cells' energy-producing structures (mitochondria) work better. However, the authors note that more research is needed before these treatments can be used in regular patient care.
Practical Takeaway
This is a review article summarizing existing research rather than a new study, and it focuses on inhaled hydrogen gas in a medical emergency setting—not hydrogen water for general wellness. While early evidence suggests these inhaled gases may help protect the brain after cardiac arrest, the authors emphasize that much more research is needed before clinical use. This review does not provide evidence supporting hydrogen water consumption for health purposes.
Abstract (excerpt)
Despite recent advances in the management of post-cardiac arrest syndrome (PCAS), the survival rate, without neurologic sequelae after resuscitation, remains very low. Whole-body ischemia, followed by reperfusion after cardiac arrest (CA), contributes to PCAS, for which established pharmaceutical…