Recently at an appointment, I was discussing my phenotype with my respirologist and he mentioned my key tissues and as usual that my case is complex. For some reason, we always draw diagrams during this part of the discussion. I really value them because they have turned out to explain to me about remodeling.1 Severe airway hyperresponsiveness (super twitchy airways, also twitch airway always make me think of itchy airways which I guess, while not exactly the same, is similar to that mechanism.2 My crazy inflammation and my ongoing roller coaster ride with eosinophilia, while not all my inflammation is connected to processes related to eosinophilia, it is a major contributor.3 Mucus hypersecretion; honestly, I think this is the worst part of my asthma and unfortunately, there is very little that can be done. Although some of the new biologics look to be promising.4 Airway obstruction is now making an appearance in the diagram as scarring or fibrosis. There has been some discussion about this in the past. The discussions seemed to be more theoretical, than a reality but I guess it is official now.
Refresher course on airways scarring/fibrosis
I needed a refresher course on what airway scarring/fibrosis is. It is thought to be associated with airway hyperresponsiveness and fixed airway obstruction and a key factor in the pathogenesis of asthma.1 One of the thoughts is that chronic airway inflammation can lead to airway remodeling, although the exact role of inflammation in airway remodeling is controversial, it is thought to be a contributing factor. It is thought that inflammation leads to a secondary repair process.2
Airway remodeling can be considered to be structural changes in both the large and small airways. This includes changes in the subepithelial fibrosis, increased smooth muscle mass, enlargement of glands, neovascularization, and epithelial alterations.3
Remodeling changes the airway walls by thickening them, which leads to airway narrowing, bronchial hyperresponsiveness, airway edema, and mucus hypersecretion.5
Airway remodeling is measured by lung specimens. While bronchoscopy is safe and minimally invasive. The development of new tools to identify remodeling markers in blood, urine, and sputum have been developed as alternatives to biopsy sampling through bronchoscopy. Corticosteroids are a mainstay of inflammation control and one of the preventive measurements although much is still being learned in hopes that alternative therapies can be developed.4
Airway remodeling is linked to poor clinical outcomes in asthmatics. Early diagnosis and hopefully prevention of airway modeling leads to better outcomes in asthmatics. I am hoping that I can keep any further remodeling at bay.