Propeller publishes paper showing improvements in asthma symptoms and control

We are proud to share the recent publication of new clinical evidence from Propeller!


Louisville, Kentucky, is consistently ranked as one of the most challenging places to live with asthma in the US. Starting in 2012, Propeller joined forces with Mayor Greg Fischer, and city and local partners to learn more about this asthma burden and help improve outcomes for local residents living with asthma.


We studied the impact of Propeller on a group of 95 participants from Louisville during the pilot phase of our work with the city. We found that people showed consistent and sustained improvements in asthma outcomes over the 13-month study period, including more than 39% fewer rescue inhaler uses, 23% more symptom-free days, and improved asthma control. You can learn more about the study, which was published in Annals of Allergy, Asthma and Immunology.

Significant reduction in mean rescue medication use per person per day throughout the 13-month program (error bars represent 1 SD). Each month was significantly lower than the first month (p < 0.001).


That means more people in the program could live their lives with fewer disruptions caused by asthma symptoms. More asthma-free days means more days playing with their kids, enjoying a hike on their vacation, or not missing days of school or work.


“It helped me to see what was causing the asthma and what I can do to keep the asthma under control. I’ve been able to use my emergency inhaler much less than I had to initially and it helped the doctor to decide what medicine would work best to control my asthma when it does flare up.”

  • Propeller member from Louisville


What sets this study apart from Propeller’s past clinical studies showing improved control, is that Propeller wasn’t integrated into a clinical care system. Rather, it relied on individuals to self-manage and share the information with their doctor if they chose to. While combining Propeller’s clinical care dashboard and individual patient self-management tools results in the largest improvements in asthma control, it’s promising to see that Propeller’s patient tools can enhance outcomes on their own by encouraging better self-management as well.


“I see patients everyday in my asthma and allergy practice in Kentucky. It’s encouraging to see them engaging with their data and better managing their disease with Propeller. As past President of the American College of Allergy, Asthma & Immunology (ACAAI), I am committed to improving care for patients. I think Propeller, combined with the best clinical care, will have an important impact on personalizing treatment and improving asthma outcomes into the future.”


  • James Sublett, MD, Co-Founder and Managing Partner of Family Allergy and Asthma in Kentucky, and senior author on the study


“At Humana, we want to help people achieve more healthy days, free from limitations of their physical and mental health. This study demonstrates that the Propeller system can support people in the self-management of respiratory conditions to experience better outcomes.”


  • Andrew Renda, MD, Director Bold Goal (Population Health), Office of the Chief Medical Officer at Humana, and one of the coauthors on the study


These findings are one of the reasons we were able to expand the scale and scope of our work in Louisville. With generous funding from the Robert Wood Johnson Foundation, we launched our 1,147-person study, AIR Louisville. The early results are in, but stay tuned for more papers coming from that program soon….


At Propeller, we’ve worked since the beginning to demonstrate the effectiveness of the platform on clinical outcomes. We’re proud to celebrate another peer-reviewed published paper and over 30 abstracts reviewed and presented at clinical conferences around the world. Explore our list here.