Earlier quoted context omitted.
A former registered nurse once told me that heart problems typically start as lung problems. Heart stress isn't at all unusual with lung distress. The two systems very much work together. I have serious lung problems and I used to have arhythmia. I don't have arhythmia anymore. I'm generally healthier than I used to be. I don't know why the death rate on ventilators is so high. I'm not inclined to do a lot of specula…
That line about lung problems being the primary cause for heart problems got to be wrong, without context...
You can readily Google the idea and come up with multiple articles indicating that lung problems can cause heart problems and heart problems can cause lung problems. As I stated above, the heart and lungs work closely together, so it's not uncommon to have problems with both at the same time.
(Please kindly don't try to tell me that's not what I said. It's 3am here and these are comments on a forum, not a PhD thesis. I'm telling you it means the same thing to me. I've given my clarification as best I can and I didn't say "primarily," I said typically, which really doesn't sound the same to me. Given how the heart and lungs work, I think my friend was likely correct that the direction of cause and effect typically starts with the lungs and goes to the heart from there, but not always, of course.)