Expert ECG 18
- Normal sinus rhythm
- Premature atrial contractions
- T wave abnormality - Memory T waves
Memory T wave abnormalities occur when there is a sudden change in ventricular activation. This occurs in the setting of termination of prolonged ventricular pacing, termination of sustained ventricular tachycardia or when a rate dependent bundle block terminates and changes back to a narrow complex. The T wave inversions are asymmetric helping to distinguish from ischemia. They are transient and eventually return to normal. This ECG was from a patient with a pacemaker who was not pacing during this tracing, but the memory T waves were present.
Related Topic Reviews: Premature Atrial Contractions