Franklin had a check up today with the kitty cardiologist and he's doing great! No arrhythmia, the heart murmur is barely detectable, and the no change in the enlargement - yay! Cardiac arrest is unlikely, at least for now. It's been over a year and a half since my regular vet heard that bad heart murmur....she didn't think he would live 6 months so we are beating the odds....