I had a Ross Procedure in 2004 and they first detected dilation in my root/ascending aorta in 2007. They weren't too concerned at first but when I came back in 2008 it had continued to dilate. I went to every 6 month check ups at that point and between my checkup in spring of 2010 and fall of 2010 it went from 4.8cm to 5.2cm and they sent me to have a surgical consult. The surgeon recommended surgery at my earliest convenience. I didn't have insurance at the time so there was some delay as I applied for disability (they put me on a no work order in fall of 2010). In late January of 2011 there was still no decision on my disability and my surgeon said that we needed to do the surgery and would worry about the "paperwork" later. Interestingly enough I was approved for disability the following week. They did an echo and CT scan before surgery and measured the dilation at 5.6cm. I had surgery on February 22nd and the surgeon said it was actually 5.8cm.
The moral of my long winded post is that in my case, the larger the dilation got, the faster it got larger.
The moral of my long winded post is that in my case, the larger the dilation got, the faster it got larger.