The QRS complex consists of the Q wave, the R wave and the S wave. The QRS complex comes after the P wave when the SA nodal action potential travels through the AV node to the ventricles to cause ...
The atrial rate is indicated by the frequency of the P waves. The ventricular rate is indicated by the frequency of the QRS complexes. In the absence of disease, the atrial rate should be the same ...
A 76-year-old woman presents with a persistently rapid heart rate that she attributes to her pacemaker. What does the ECG ...
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 ...
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Sinus Arrhythmia: What’s Normal vs. IrregularHeart rate is between 60 and 100 beats per minute. P waves will be present and have the same shape throughout. A QRS complex will follow each P wave. The P-R intervals will be between 120 to 200 ...
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