Usually occurs during a rapid, regular abnormal atrial rhythm such as atrial tachycardia or atrial flutter and results in an irregular ventricular response (i.e. the degree of conduction varies between 2:1, 3:1, 4:1, etc.)
![](https://ecgmadesimple.ca/wordpress/wp-content/uploads/2022/02/variable-AV-conduction.png)
Usually occurs during a rapid, regular abnormal atrial rhythm such as atrial tachycardia or atrial flutter and results in an irregular ventricular response (i.e. the degree of conduction varies between 2:1, 3:1, 4:1, etc.)