SVT happens when the electrical system that controls your heart rhythm is not working properly . This causes your heart to suddenly beat much faster. It can then slow down abruptly. A normal resting heart rate is 60 to 100 beats per minute (bpm).
SVT happens when the electrical system that controls your heart rhythm is not working properly . This causes your heart to suddenly beat much faster. It can then slow down abruptly. A normal resting heart rate is 60 to 100 beats per minute (bpm).