Life-threatening AV nodal re-entrant tachycardia: Four cases illustrating four different harmful mechanisms

- AVNRT is a common, usually benign, arrhythmia.
- In rare cases, AVNRT can cause life threatening consequences.
- We illustrate four different mechanisms through which AVNRT can cause harm.
- Clinicians should remain vigilant for harmful presentation of AVNRT, especially with the availability of curative ablation.