SVE on an ECG stands for Supraventricular Ectopy, also known as Supraventricular Ectopic beats. These are abnormal heartbeats that originate above the ventricles in the heart, specifically in the atria or the AV node. They are also sometimes referred to as Premature Atrial Contractions (PACs) or Atrial Ectopic beats.
Understanding Supraventricular Ectopy (SVE)
Supraventricular ectopy (SVE) signifies the presence of extra, early heartbeats that originate from a location above the ventricles (the lower chambers of the heart). These beats interrupt the normal rhythm of the heart.
Key Characteristics of SVE on ECG:
- Premature Beats: SVEs appear earlier than expected in the normal heart rhythm.
- Abnormal P-wave: The P-wave (representing atrial depolarization) may be shaped differently than normal, or even be hidden within the preceding T-wave. The P wave may also be inverted.
- Normal QRS Complex: Typically, the QRS complex (representing ventricular depolarization) appears normal in duration and morphology, because the impulse still travels through the ventricles via the normal conduction pathway. However, aberrant conduction might occur, leading to a wider QRS complex.
- Compensatory Pause: After a PAC, there may be a pause before the next normal beat. This is a compensatory pause.
Causes and Significance:
SVEs are common and often benign. However, frequent or symptomatic SVEs may warrant further investigation. Potential causes include:
- Stress
- Caffeine or alcohol consumption
- Electrolyte imbalances
- Heart conditions (e.g., atrial fibrillation, heart failure)
- Certain medications
When to Seek Medical Attention:
While occasional SVEs are usually harmless, consult a doctor if you experience:
- Frequent palpitations
- Dizziness or lightheadedness
- Shortness of breath
- Chest pain
- Underlying heart condition
Diagnostic Evaluation:
An ECG is the primary tool for identifying SVEs. Additional tests may be ordered to determine the underlying cause and assess the overall health of your heart.
