NSVT is defined as an episode of v-tach lasting less than 30 seconds. Why 30? I read a post on here where some guy said he went into a v-tach episode that lasted 37 or 38 seconds during a stress test. He also said that he remained conscious the whole time through the episode. That got me wondering whether he knew what he was actually talking about. Could it have been PSVT and not VT? The fact that he remained conscious the entire time is one thing, but my bigger question is about the duration of NSVT. Why is it defined as lasting under 30 seconds? Is it impossible for VT to terminate on its own after 30 seconds? Or is it just exceedingly rare?