Could Diastolic dysfunction give a person a short burst of SVT’s? I have never had any SVT’s before, all mine tachycardia has been POTS/postural related. But yesterday, while just sitting, my heart suddenly just went from normal to 180 BPM’s! It did that for about 2 minutes (seemed longer!) and then just as suddenly, kind of sputtered a bit and went down quite a bit. Stayed a bit high for a couple of hours, but only like 120’s, and more POTS like. I tried doing deep, slow breaths while it was happening but that didn’t seem to effect it. Thought about standing up, changing position, but was too scared, fearing it might get worse. Thoughts anyone?