What is the etiology of tracheomalacia after bypass?

Not sure: Cannot think of connection between bypass surgery and tracheomalacia ... May have already had undiagnosed tracheomalacia, but diagnosed by anesthesiologist or intensivist while intubated for your bypass surgery ... Also prolonged mechanical ventilator support, with prolonged intubation may have caused inflammation of your trachea that may have caused some weakening of your tracheal cartilages.