H(2) gas improves functional outcome after cardiac arrest to an extent comparable to therapeutic hypothermia in a rat model.
Kei Hayashida, Motoaki Sano, Naomi Kamimura, Takashi Yokota, Masaru Suzuki, Yuichiro Maekawa, Akio Kawamura, Takayuki Abe, Shigeo Ohta, Keiichi Fukuda, Shingo Hori · Journal of the American Heart Association · 2012
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Independent study record
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H2HUBB TAKEAWAY
In rats, serum IL-6 levels 2 hours after ROSC were not significantly increased in post-CA rats of the H₂ group (848.9±257.0 pg/mL) or H₂ +TH group (933.3±339.0 pg/mL) compared with sham-operated rats, but in the H₂ +TH group, serum IL-6 levels were suppressed to the same degree as that of post-CA rats receiving only H₂ gas. These preclinical findings add evidence supporting molecular hydrogen's therapeutic potential within the outcomes and biological pathways measured in this model.
What the Findings Mean
H2HUBB reviewed how inhaled hydrogen gas affected the outcomes measured in rats. Serum IL-6 levels 2 hours after ROSC were not significantly increased in post-CA rats of the H₂ group (848.9±257.0 pg/mL) or H₂ +TH group (933.3±339.0 pg/mL) compared with sham-operated rats, but in the H₂ +TH group, serum IL-6 levels were suppressed to the same degree as that of post-CA rats receiving only H₂ gas.
What the Researchers Studied
The researchers studied rats. The study used a preclinical animal experiment. The comparison condition was control condition or baseline measurements.
What Effects Did Molecular Hydrogen Have?
Rats were randomly assigned to 1 of 4 experimental groups when mechanical ventilation (MV) was resumed at the beginning of CPR: MV with 2% N₂ and 98% O₂ at normothermia (the control group), MV with 2% H₂ and 98% O₂ at normothermia (H₂ group), MV with 2% N₂ and 98% O₂ in targeting therapeutic hypothermia (the TH group), and MV with 2% H₂ and 98% O₂ in targeting TH (the H₂ +TH group) ( Figure 1 ). The concentration of H₂ in the gas mixture was determined using the Breath Gas Analyzer Model TGA-2000 (TERAMECS, Kyoto, Japan). When mechanical ventilation was resumed (start CPR), rats were assigned to 1 of 4 experimental groups: mechanical ventilation (MV) with 98% O₂ +2% nitrogen (N₂ ), the control group; MV with 98% O₂ +2% hydrogen (H₂ ), the H₂ group; MV with 98% O₂ +2% N₂ +therapeutic hypothermia (TH), the TH group; and MV with 98% O₂ +2% H₂ +TH, the H₂ +TH group. Serum IL-6 levels 2 hours after ROSC were not significantly increased in post-CA rats of the H₂ group (848.9±257.0 pg/mL) or H₂ +TH group (933.3±339.0 pg/mL) compared with sham-operated rats, but in the H₂ +TH group, serum IL-6 levels were suppressed to the same degree as that of post-CA rats receiving only H₂ gas. The authors concluded that inhalation of H(2) gas is a favorable strategy to mitigate mortality and functional outcome of post-CA syndrome in a rat model, either alone or in combination with TH.
Why These Findings Matter
These preclinical findings add evidence supporting molecular hydrogen's therapeutic potential within the outcomes and biological pathways measured in this model.
How Strong Is This Evidence?
This is preclinical animal evidence from a preclinical animal experiment. It is most informative for the disease model, mechanisms, biomarkers, and outcomes directly measured in the study.
Technical Study Details
H2HUBB classifies this publication as animal study with preclinical animal evidence. The research population or model was rats. The study used a preclinical animal experiment. The hydrogen delivery method was inhaled hydrogen gas.
Limitations and Safety
Reported limitations: 28 the researchers could not conclude that whether H₂ inhalation has the same beneficial outcome as TH because of the small sample size and low statistical power. Safety information: The concentration of 2% H₂ was determined on the basis of previous observations 7 as an optimal and safe concentration.
Original Study and H2HUBB Research Context
H2HUBB presents this source-grounded research record as one contribution to the broader molecular-hydrogen evidence base.