Environmental, healthcare and societal impacts of asthma: a UK model-based assessment.

Background: This study aimed to assess the broader environmental, healthcare and societal impacts across the entire asthma pathway from diagnosis to treatment in the UK.

Methods: A comprehensive cost-of-illness framework was developed considering the effects of the full asthma patient pathway, including greenhouse gas emissions generated from inhalers, National Health Service (NHS) costs, health-related quality of life and productivity losses. The model was based on published literature and clinical expert opinion to accurately estimate, in monetary terms, the net present value of the asthma pathway impacts for 2022-2031.

Results: The estimated net present value of the environmental, healthcare and societal impacts of the asthma pathway was £47 billion over the 2022-2031 period in the UK. Loss of disease control was a key contributor to higher greenhouse gas emissions and NHS costs. In 2022, a patient with non-severe uncontrolled asthma was estimated to incur 22% higher NHS costs than a patient with controlled asthma, while generating 0.1 t more of CO equivalent emissions. In the same year, the total direct impacts per patient with severe asthma were four times higher than for a patient with non-severe controlled asthma, with 0.54 t CO equivalent of greenhouse gas emissions. Moreover, as much as 77% of the total economic impact was driven by worsening health-related quality of life and productivity impacts occurring when patients' symptoms were uncontrolled.

Conclusions: Uncontrolled asthma significantly impacts patients, the economy and the environment in the UK. Our results emphasise the need for a holistic approach in controlling asthma and should be carefully considered when developing policies to mitigate the overall burden of the disease.