I took Sundance to the vet and they ran the EKG again and it showed very big T waves, (I do not know what that means) so I am making an appointment with a pet cardiologist, I will probably have to wait 4 weeks for an appt. My vet said my cat is in very good health, no distress and it may be something he will outgrow, but he wanted me to have the cardiologist check because he is not real familiar with heart problems. Thanks for asking will keep everyone posted.