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Now COPD and asthma have some overlap so I want you to be kind of familiar with that, that
there's an asthma-COPD overlap syndrome. So some patients have this bronchial inflammation
that we see both in asthma and in chronic bronchitis or emphysema. So, they're going to
have some symptoms that are very similar. Now it's characterized by this persistent airflow
limitation. That means happens more than just a short-term event and you have this
persistence, hangs around a while and airflow that's not able to get in and out as it would in a
normal airway. Now there are several features that are usually associated with asthma and
several features that are usually associated with COPD that they have overlap. That's why
they identified in clinical practice by features that it shares with both asthma and COPD. So
there's a consensus statement from the Global Initiative for Chronic Obstructive Lung Disease
and the Science Committee. So, you've got this information, you can take a look at it if you
want to and I've got the website address for you there. But just as a big overarching concept,
you're going to have similar symptoms in some of asthma and COPD characteristics and that's
why they talk about the overlap between the 2 diseases. Now, airflow obstructions. Asthma,
chronic bronchitis, and emphysema have interrelationships and that's really the takeaway
point. Now, when it's not COPD, if a patient has asthma but their airflow obstruction is
reversible that's the difference. So if patient has chronic bronchitis or emphysema or both
but doesn't have airflow obstruction, they don't have the overlap.