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PVC

ECG Basics: Normal Sinus Rhythm With Premature Ventricular Contractions

Sat, 02/21/2015 - 17:22 -- Dawn

This ECG shows an underlying rhythm of normal sinus rhythm at a rate of 80 / min.  There are two premature ventricular contractions (PVCs).  The sinus rhythm actually continues uninterrupted, causing a “compensatory pause”.  If you march out the P waves, you may even see hints of the hidden P waves in the ST segments of the PVCs.  The P waves that occur in the ST segments of the PVCs land in the refractory period of the ventricles, and so are unable to continue into the ventricles and cause a QRS.

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