Our DS doesn't have mitral valve stenosis but he does have a congenital heart defect. His is a bicuspid aortic valve (basically there should be three leaflets making up a valve - a bit like flower petals - they open flat against the wall of the heart to allow blood to pass through then close shut to keep it from back flowing). A bicuspid valve has just two leaflets so doesn't open fully which means the heart works ultra hard. That's lead to aortic stenosis (so the aorta is narrowed). When DS was diagnosed, at two weeks old, we were told it was so severe it was like trying to water the lawn with a hose pipe the same diameter as a straw so pressure was building at the heart level.
DS had a balloon valvuloplasty (a balloon on a catheter which goes up through the artery - in DS's case) then through the heart to pop the valve open making it larger. That disperses the pressure.
DS had to have another one this year as the valve was thickening slightly so pressure was building again. He may have to have a replacement at some point.
But, he is now 11 years old, went on an outward bound holiday with school (with permission from his consultant of course). He did sea kayaking, rock climbing, abseiling, walked 9km through waterfalls in a gorge and generally had a fantastic time!
He's thrilled that Arnold Swarzenegger has the same congenital heart defect as him and has just had a valve replacement. Shows you what can be done.
If it's mild there is every chance they'll just monitor regularly. DS was on annual consultant meetings until this year when he went back to three monthly because of the 2nd balloon valvuloplasty. By the way that was done under general anaesthetic and he would have been out the same day but the procedure was delayed because of an emergency so we stayed in over night. Apart from a lot of bruising he was walking without pain the next day, had paracetamol to help him get to sleep and by the third day was back at school with no pain killers at all.
The valve issues are seen so often that consultants know exactly what they are doing. It's easy to say 'try not to worry' but these are relatively common amongst heart patients so the technology is growing every day.
Have they arranged a check with a heart hospital?