Table 1.

Pathophysiological actions of H₂S in the lung.

Action	H2S	References
Vasodilation	↑	[153,154]
Stable asthma	↓	[35,36,38,52,68,102,174]
Bronchodilation	↑	[103]
Angiogenic activity	↑	[22]
Pro-inflammatory action	↑	[61]
Anti-inflammatory action	↑	[61]
Airway hyper-reactivity	↑	[63,64]
Asthma exacerbation	↓	[35,36,38,52,68,102,174]
Stable COPD	↑	[65]
COPD exacerbation	↓	[37]

↑ = Increased, ↓ = decreased.