I work at a university hospital where we accept VAD and total artificial heart patients. I had several classes, modules, and hours training with LVADs (HeartMate2 and Heartware mainly). I also attended a class called "Advanced Cardiac Therapies" where the top staff physicians and surgeons educate RNs and MDs on every mechanical device we offer as well as transplants. From all of this, I have never received a "certification" other than through the hospital. Obviously it is a very limited field since VADs are not everywhere. However, it is an excellent area to have knowledge in since it is rather rare.