SVT episode, how long is too long or when to go to ER?

one more thing... no one should have episodes lasting 12
hours...actually a great time to get to the office, or ER for a 12 gauge EKG......easier said than done, if you are not in a close radius of either... your risk of stroke increases with the time span of the event.
a great choice is to see an electrocardiologist, versus a cardiologist...If you can be referred, you would get much more info about your own problem... as you said, do those episodes cause increased weakening, etc?

I live within 1/2 mile of a walk-in urgent care facility and also, a large Trauma 1 hospital. I am under the care of an EP who is a senior member of the hospital’s cardiovascular group. Your statement that “the risk of stroke increases with the span of the event” is medically incorrect, in the SVT context generally and given the particulars of my case. The prolonged episodes only make me tired, requiring a nap. However, frequent episodes, of long duration probably weaken the heart’s walls, which warrants further investigation. Thanks again for your input!

There is SVT and there is SVT with RVR. Same for atrial fibrillation (AF). A heart rate higher than 100 BPM is a sign of RVR, meaning your ventricles are responding to the same signal. The AV node is passing it down to the two ventricles and, unless there is a bundle branch block, they'll both respond within a few milliseconds of each other and of the atria above them. It's a sinus rhythm, but it's a tachyarrhythmia.
I have looked for something definitive about how long to let a run of AF or SVT go when RVR is apparently present, and the answer is 24 hours. But that's only a guide. A much, MUCH, better guide is how the arrhythmia makes you feel. If you feel faint, do faint, are disoriented, short of breath, and generally feeling unwell, needing help to do basic things, then you need to get to an ER.
Personally, as a wimpy AF sufferer, I never let mine go for more than 6 hours. Not only did I feel deeply anxious, and was I acutely aware of the thumping in my chest, but my HR was always north of 140, and at 70 years of age, that's putting me at my theoretical maximum. And I'm seated!
I have seen recent research that the risk of stroke with SVT is higher, about two times, but only as a first study. The paper said more research was needed. There was no mention about how long one had to be in SVT. For AF, the risk rises with the length of the run, and current protocols suggest a DOAC like Rivaroxaban or Apixaban after 24 hours. Thinking of the mechanism and what's happening inside the left atrium within a few minutes, I would think the risk of a stroke from a dislodged clot goes way up within a few minutes. But, I'm no expert, have not done any research of my own except reading what others have stated, and I'm safely on a DOAC. With AF, not with SVT.

There is SVT and there is SVT with RVR. Same for atrial fibrillation (AF). A heart rate higher than 100 BPM is a sign of RVR, meaning your ventricles are responding to the same signal. The AV node is passing it down to the two ventricles and, unless there is a bundle branch block, they'll both respond within a few milliseconds of each other and of the atria above them. It's a sinus rhythm, but it's a tachyarrhythmia.
I have looked for something definitive about how long to let a run of AF or SVT go when RVR is apparently present, and the answer is 24 hours. But that's only a guide. A much, MUCH, better guide is how the arrhythmia makes you feel. If you feel faint, do faint, are disoriented, short of breath, and generally feeling unwell, needing help to do basic things, then you need to get to an ER.
Personally, as a wimpy AF sufferer, I never let mine go for more than 6 hours. Not only did I feel deeply anxious, and was I acutely aware of the thumping in my chest, but my HR was always north of 140, and at 70 years of age, that's putting me at my theoretical maximum. And I'm seated!
I have seen recent research that the risk of stroke with SVT is higher, about two times, but only as a first study. The paper said more research was needed. There was no mention about how long one had to be in SVT. For AF, the risk rises with the length of the run, and current protocols suggest a DOAC like Rivaroxaban or Apixaban after 24 hours. Thinking of the mechanism and what's happening inside the left atrium within a few minutes, I would think the risk of a stroke from a dislodged clot goes way up within a few minutes. But, I'm no expert, have not done any research of my own except reading what others have stated, and I'm safely on a DOAC. With AF, not with SVT.