Maybe so, but most of us who needed pacemakers after aortic valve replacement found out right away -- not 13 years later. The most common driver for pacemaker implants after aortic valve replacement is damage to the nerve bundle that connects the atria to the ventricles. This nerve bundle runs right alongside the aortic valve, and in some cases (like mine) the surgeon needs to cut wide around the native valve to remove a badly calcified valve, and in doing so, damages the nerves.
I did have brady/tachycardia prior to surgery. In my case, my resting heart rate was down around 48-50 BPM, but under exercise load my heart would go up to the 170's. Immediately after surgery, while still in ICU, my heart would go slow, it would go fast, it would skip beats, it would add beats. . . OR it might just stop! I would experience stoppages of 20-30 seconds at a time. Of course, this would set off all the alarms. Let me tell you, it is no fun to watch your own cardiac monitor go "flat line." I would see it go flat, feel funny, and the lights would go out. When I awoke, it would be to see a circle of very concerned looking faces looking down at me. Within days of valve surgery, I received my first pacemaker, and the problem was solved.
Don't fear the pacemaker. I am now just about 10 years into this saga, on pacemaker number 2, and I still say "The only time I am reminded that I have a pacemaker is when I look into the mirror with my shirt off."