Do patients have Mental Changes post heart surgery due to anesthesia?

Hello, I have a question and sorry if its silly. I just had to ask as I just heard a co-worker of mine say this to another co-worker. My co-worker's dad is going to have an open heart surgery tomorrow-and long story short she was saying that 'anesthetic' can change people mentally. Is this true? She went on about saying that her step mom was talking to her saying that, "well, you know these big surgeries can change people", and she told her that it's not the 'type' of surgery but rather the anesthetic being used that people come back different?

Thanks in advance for taking the time to answer this