My vet thinks my cat has a nasopharyngeal polyp but he needs to go under anesthesia so he they can know for sure and get it out, but he was also listening to my cats heart and said he has a grade one mitral heart murmur and that he needs to have xrays and ultrasounds and such done to make sure his heart is ok before going into surgery because they said his heart could fail while under anesthesia and he could die. My dad said they we should just go ahead with the surgery without spending $550 extra dollars because he doesn’t think he has anything serious wrong his heart considering it was only a grade one heart murmur and my cat was already very nervous about the car ride and being at the vet and that could have caused his heart rate to be off a little. Would it be necessary to look into his heart further or just go ahead with the surgery considering it would only be a 20-60 minute surgery? Would a cat with any type of heart conditions die during surgery? What should I do next?