A 76-year-old woman presents with a persistently rapid heart rate that she attributes to her pacemaker. What does the ECG show?

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 ...

R wave and S wave, the “QRS complex” represents ventricular depolarization. This term can be confusing, as not all ECG leads contain all three of these waves; yet a “QRS complex” is said ...

Complex: The combination of multiple waves grouped together. The only main complex on an ECG is the QRS complex. Point: There is only one point on an ECG termed the J point, which is where the QRS ...

Normally, there is no electrical activity (flat ECG) between ventricular depolarization (reflected by the QRS complex) and repolarization (T wave), corresponding to the ST segment, because all ...

Normal ECGs include common, training-related findings in athletes such as high QRS amplitude ... pathological Q-waves, left axis deviation and conduction delays and findings suggestive or diagnostic ...