What role does Atenolol (Tenormin) play in managing heart palpitations?

I’m glad to hear that your child has recovered well. Short answer: The good news is that most children treated for Kawasaki disease recover fully with no long term complications, and will not need further treatment. The earlier he was treated, the better. Recurrence of Kawasaki disease is uncommon. He should, however, continue to follow a healthy diet, and adopt healthy lifestyle habits to reduce the risk of future heart disease (this applies to all children, not just those who have Kawasaki disease).

My answer, to your question in brief is that it’s worth a shot (pun not intended). From your details, you clearly fall into what doctors term “expert patients”. Ie. you’ve done a significant amount of online reading into your problem, and possible solutions. Not to mention, sought the advice of multiple specialists. So please take my online reply for what it is – an extremely limited internet source (without the requisite examination, investigation results, specialist opinions and detailed questioning that a doctor seeing you in person would have).