I believe you are thinking of the National Jewish patient lecture series from last Sept. Dr. Jeffrey King talked about the relationship between GERD and bacteria in the lungs. As I recall, it's not the kind of GERD we are familiar with because mycobacteria don't live in stomach acid. He described a test for the kind of GERD that causes lung bacteria. That test requires a measuring device dropped through the nose into the esophagus which must be left there for 22 hours.

I hope someone will post the link again.