Swan-Ganz catheter | The pulmonary artery catheter (PAC) is frequently referred to as a Swan-Ganz catheter. PAC is the insertion of a catheter into a pulmonary artery. Its purpose is diagnostic; it is used to detect heart failure or sepsis, monitor therapy, and evaluate the effects of drugs. The pulmonary artery catheter allows direct, simultaneous measurement of pressures in the right atrium, right ventricle, pulmonary artery, and the filling pressure ("wedge" pressure) of the left atrium.
The only person you can change is YOURSELF and it can be challenging at times. So, with that in mind you need to understand that you don't have the power to change or fix someone. Like the old saying goes: You can lead a horse to water, but you can't make it drink. So stop trying to fix them... just let them be.