202308131825

Status:

Tags: ECG

AV Dissociation

3 Causes:

1. Usurpation
   • P waves transiently do not conduct because of an accelerated junctional rhythm that takes over
2. AV dissociation by default
   • a junctional escape rhythm takes over by “default” (ie, because of SA node slowing)
   • e.g. beta blocker use
3. AV heart block
   • IF P waves fail to conduct despite having adequate opportunity to do so

References

A Woman in Her 50s With Chest Pain and Lightheadedness and Anterior Subendocardial Ischemia