Who is What
Learning Objectives: 1) To apply the knowledge of the conduction system 2) To differentiate and identify the different pacemakers as reflected in the ECG Who is responsible for this rhythm? Now that you have gone through the conduction system and the Normal ECG, lets build and expand on that understanding. As have been emphasized , a Sinus Rhythm is initiated by the SA node and reflected in the ECG by a P wave. However, you would want to differentiate between positive deflection P wave, negative deflection P wave and rhythms with absence of P wave. Positive Deflection P wave In this rhythm, all the P waves are upright. Hence it is the SA node who is responsible for the Sinus Rhythm. Negative deflection P waves In this rhythm, all the P waves all negatively deflected and the QRS width are normal . Hence it is the Bundle of His who is responsible for this rhythm. It is call a Junctional rhythm. In addition, a normal QRS width, with either an absence of P waves o...
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