A combination of the Q wave, R wave and S wave ... a longer time is necessary, and the QRS duration is widened. A widened QRS duration occurs in the setting of a right bundle branch block ...

In the remaining studies, widened QRS complexes were most commonly attributed ... [91] There is little data on specific T- and/or U-wave findings associated with cocaine use.

Hyperkalemia causes peaked T waves initially, then an intraventricular conduction delay with a widened QRS complex, then bradycardia. Eventually a “sine wave” pattern ensues. Hyperacute T ...

These ECG voltage attenuations are of extracardiac mechanism, and impact the amplitude of QRS complexes, P-waves, and T-waves, occasionally resulting also in shortening of the QRS complex and QT ...