Focal Left Atrial Tachycardia in a Patient with Left Ventricular Noncompaction

Figure 2

12 lead ECG. P wave become obvious as the heart rate decrease from 139 to 115. P waves are inverted in lead II and AVL, while the P waves were upright in III and AVF, suggesting the possibility of ectopic atrial tachycardia, most likely originating from the left side.