Heat waves elevate risks of airway hypersensitivity that inhaled endogenous ions reduce

Area of Science:

• Environmental Science
• Respiratory Medicine
• Biophysics

Background:

• Rising global temperatures and heat waves exacerbate respiratory conditions.
• Current protective measures for airways during heat waves, besides emission reduction, are unclear.

Purpose of the Study:

• To investigate the impact of heat waves on airway health.
• To identify methods for mitigating heat wave-induced respiratory risks.

Main Methods:

• Climate modeling and continuum mechanics analysis.
• In vitro cell culture models (human bronchial epithelial cells).
• Human clinical data analysis from a cough study.

Main Results:

• Heat waves increase cough hypersensitivity risk due to airway aridity and mucosal collapse.
• Alkaline (pH > 8) hypertonic divalent salt aerosols reversed mucosal collapse in vitro.
• Clinical trial showed alkaline aerosols significantly reduced cough bouts in patients with refractory chronic cough.

Conclusions:

• Inhaling alkaline hypertonic salt aerosols can protect airways from heat wave-induced damage.
• This intervention may offer a strategy to reduce the global burden of respiratory illness linked to climate change.