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@bsi15

what I've read so far, it's the lung, not the heart, which causes shortness of breath

you can measure pulse-rate and breaths per minute ,
whether the quotient increases with physical activity

also measure FEV1, how much can be exhaled in 1s
there are such devices to measure it, cheapest I found was $30
or just exhale in a plastic bag and estimate the volume
then there are tables online what's the norm (age,height)

(and whether you can still exhale more after 5s waiting
and holding the breath

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Replies to "what I've read so far, it's the lung, not the heart, which causes shortness of breath..."

The heart can cause shortness of breath as well. For example, inefficient pumping (eg fluid in pericardium or damaged heart muscle) = not enough oxygen transport, and thus SOB.
In this instance, the person has both heart and lung issues - it is up to the doctors to determine which is causing the specific symptoms. It could be the congestive heart failure, or the bronchiectasis, or the infection, or a combination of all three.