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).
Read moreWhy does it feel like my heart stops beating for a second?
Usually, heart palpitations are harmless and don’t result from an underlying health problem. They happen when the heart beats out of rhythm or contracts (beats) too soon . Providers call this a premature ventricular contraction (PVC) or premature atrial contraction (PAC).
Read more