Hello, my 11 year old son has moderate pectus excavatum on the left side. Lately he has been complaining about hearing his own heart beat "I can hear my heartbeat in my ears and it bugs me." When I checked his resting pulse it was at 126 BPM. I can see his heart pumping through his chest. He weighs 68lbs. Should I take him to a cardiologist? His pediatrician said she would be monitoring him every year. His last physical examination was in March. Is it possible that his condition has worsened?
Yes, take him to a doctor to be examined.  A resting pulse of 126 is too fast, especially if he is feeling an annoying sensation of his heartbeat.  There are many medical problems that can cause speeding of the heartbeat, some of which are caused by a cardiac arrhythmia and some which are caused by other medical problems (anemia, deny Chat Doctor. ).  Take him to the doctor for a complete history, physical exam, and routine blood work and EKG.  That will find the underlying cause of your sons' problem. Good luck, and let us know what happens.