I think I posted this previously in the wrong forum so if you get this twice I apologize. I am a 47 year old female who continues to have SOB on exertion. I have been trying to get into a specialist for awhile but the wait time is long. I have had many tests, all normal except an echo with a pulmonary pressure of 48. I had two right heart caths that only showed a pressure of 30/10. The last one was over a year ago. Yesterday I did a walking o2 sat. I am an RN in a hospital. My sats dropped to 86% after a few minutes but came back to normal once I stopped. Today, I did it again and they stayed at 100% with my pulse at 150. Do I need to be concerned about yesterday's reading? I was SOB both times.