SVT or seizure

Hello, this is my first post.  About six months ago I started having all kind of symptoms.  My heart races to 130 or140 bpm sometimes from just standing up.  When this happens I get a tightness in my chest and left arm.  Well after all the tests came back normal (ekg, holter, stress, echo) I went to get a second opinion.  Yesterday I had a nuclear stress test and during the exercise I felt a pop or a deep click and then complete disorientation and fear, my heart rate instantaniously jumped to 180 and the nurse asked if a lead had disconnected.  I heard the PA say that I was in SVT.  I turned clammy, sweaty, and very very shaky.  They completed the test with adenosine, but I felt exactly the same, during the adenosine my face was paralyzed to where I could barely talk.  I noticed during this it felt as if I was getting shocked in my chest, the pit of my stomach, and my brain.  Could this have been induced by a seizure or vice versa?  

[Michael J. McWilliams, M.D.]

It doesn't sound like a generalized seizure, you would have lost consciousness.  SVT would not cause a seizure either.  There is probably important information in the EKG strips in how your SVT responded to adenosine.  That will help determine if this was sinus tachycardia (normal tachycardia) versus some other mechanism of SVT.  Adenosine is known to transiently make you feel terrible with chest pains and shortness of breath.  It is hard to say exactly what happened, but there is important information in the EKG strips from your stress test.

Good luck.