A normal ECG contains waves, intervals, segments and one complex, as defined below. Wave: A positive or negative deflection from baseline that indicates a specific electrical event. The waves on ...

Less commonly, SCD manifests without prior disease symptoms in individuals with structurally normal ... ECG) between ventricular depolarization (reflected by the QRS complex) and repolarization (T ...

as not all ECG leads contain all three of these waves; yet a “QRS complex” is said to be present regardless. For example, the normal QRS complex in lead V1 does not contain a Q wave — only a ...