EKG Nomenclature ECG Interpretation #301


Normal ECG tracings consist of waveform components that indicate electrical events during one heart beat. These waveforms are labeled P, Q, R, S, T and U. The following descriptions are with respect to Lead II.

P wave is the first deflection and is normally a positive (upward) waveform. It indicates atrial depolarization. QRS complex follows the P wave. It normally begins with a downward deflection, Q; a larger upward deflection, R; and then a downward S wave. The QRS complex represents ventricular depolarization and contraction.

T wave is normally a modest upward waveform, representing ventricular repolarization. U wave indicates the recovery of the Purkinje conduction fibers. This wave component may not be observable.

ekg waveform


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? onAr:3 | v:0 | onPs:2
pu? False | pv:1
pLen: 0 | nLen 1 | cCode:
| debug: | debugCtr: 0 | localNlen: 1;





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