Update via email:
Mom just called from Seattle, and they have just been in consultation with Bing's doctor.
The stress testing that they did this morning produced arrhythmias in both the atrium and the ventrical. They also said that Bing has an impressive murmur (means his valve is not sealing and the blood is being forced back through the valve). They said the scar tissue in the septum (tissue that divides the heart chambers) from the first surgery may be causing the interference.
They are expecting a consultation with the team this evening to determine whether Bing will have open heart to replace the valve or whether they will place a defibrillator.
I will keep you updated as I hear more.