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 ...

Multifocal atrial tachycardia (MAT) requires three different P wave morphologies in one ECG with a QRS complex rate of > 100. Wandering atrial pacemaker (WAP) requires three different P wave ...

and T-waves, occasionally resulting also in shortening of the QRS complex and QT interval duration. PERED alleviation, in response to therapy of CHF, reverses all above alterations. These fresh ...

In Mobitz type I second-degree AV block, the PR interval progressively lengthens from beat to beat, until there is a non-conducted P wave with no QRS complex (figure 7). The first PR interval after ...