*HB that can present with ↓Bradycardia, but not a diagnostic criteria
| Condition | ECG Key Signs |
|---|---|
| ‣ | ‣ (> 200 ms) |
| ‣ | Intermittently dropped P wave following progressive ‣ |
| ‣ | Intermittently dropped QRS complex; |
| constant, normal PR interval for conducted beats | |
| ‣ | P waves not related to QRS complexes (AV dissociation) |