u/Sad-Amoeba4316

So my little sister (18) has been struggling with chest pain for a while now. She gets random bursts of it that lasts for 1-2hours and leaves her in tears. She tells us she can’t get a full breath in and eventually it passes but she’s gone to the hospital for it once before and they gave her a muscle relaxer which doesn’t seem to help it much or at the very least prevent it. I have POTs and I don’t think she has that at all. She had another episode tonight and out of curiosity I put my Apple Watch on her. Normal HR, sinus rhythm (I know Apple is only a single lead). Here’s a screen shot of what we got though. Anyone know what this could be? She’s very active, plenty of energy, etc. but I feel like a muscle relaxer isn’t the answer here.