Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
I didn't have bypass, but I did have the catheter-directed thrombolysis which is probably what you mean by the IV catheter surgery, where they injected clot busting medication directly onto the clots via catheter. Neither surgery is very often used, as it's considered risky in itself and most people can survive PE once they are diagnosed and hospitalized, even in bad cases. For instance, my doctor really didn't expect me to make it through surgery, but he was sure I wouldn't live without it. It's been six years since I had those PEs, and I've been pretty active on this group during that time and still only seen a handful of people come here who had the same surgery I did. I have read about using heart-lung bypass for PE's, but I believe it's much less common even than what I had, usually if the clots are considered severe enough to threaten life but too old to respond to thrombolytic treatment, which only works on newly formed clots. Basically the doctors have to use heart-lung bypass so that they can go and physically remove the clots from the pulmonary arteries, rather than dissolve them as my surgery did.
I'm so sorry for what you've been through, and are probably still going through in recovery. I know that my recovery was extremely difficult, especially in the first few months, and you had a more difficult surgery than I did. It was so hard, but I can promise you that things do get better even if that seems impossible. Welcome to our group, although I'm sorry of course that you have reason to be here.