Hypokalemia causes U waves in the ECG seen as a positive wave just after ... the classic finding is an S wave in lead I, Q wave in lead III and inverted T waves in lead III (S1Q3T3 pattern).

Doctors may decide to order an ECG when evaluating a person’s heart. This is a test that measures ... points on this graph represent different waves of electrical activity.

However, there is a small septal R wave in lead V1 (↓) and a prominent S wave in V5 (←) which are not characteristic of LBBB because septal forces — resulting from initial septal activation ...

The correct diagnosis is sinus rhythm, LVH, and normal T waves (Figure 2). The ECG shows a normal P wave ... The QRS complex in lead V2 shows a deep S wave ([) and there is a tall R wave ...