Standard Ecg Complex Access

Following the P wave, the tracing returns to the baseline (the isoelectric line). The PR interval is measured from the start of the P wave to the start of the QRS complex. It is not a wave, but a period of time.

The interval between ventricular contraction and relaxation. Should be isoelectric (flat) on the baseline. T Wave standard ecg complex

The QRS complex is a critical diagnostic tool. Following the P wave, the tracing returns to

Between these waves are flat lines (isoelectric lines) that act like the "pauses" in a conversation: PR Interval: Following the P wave