The anteroseptal STEMI ECG example below is good enough to call ... This MI involves ST segment elevation in the inferior leads II, III and aVF and only requires 1 mm in 2 contiguous leads.

Note that the first three account for almost 90% of ECG tracings with LAD. If the QRS is predominantly negative in lead I and positive in lead aVF, then the axis is rightward (right axis deviation).

She returns for a follow-up visit for palpitations, and a 12-lead ECG is obtained ... 0° and +90° (positive QRS complex in leads I and aVF). The QT/QTc intervals are normal (280/440 msec).

Figure 2: An ECG obtained from a beagle dog 21 days later, showing six rhythm strips simultaneously (leads I, II, III, aVR, aVL and aVF). VPCs are the most frequent type of abnormal rhythm in dogs ...

In the ED, patient’s vital functions were supported (Figure 2). First electrocardiogram (ECG) revealed sinus tachycardia with ST depression in inferior (II, III, aVF) and precordial (V3-V6) leads.