A healthcare professional is caring for a patient who has a delay in electrical activity reaching the ventricle as seen on ECG. What ECG finding would the healthcare professional associate with this problem?
A)A prolonged ST interval
B)Variability in measurement with heart rate
C)PR interval measuring 0.28 sec
D)A QRS complex measuring 0.08 sec

Question

Quizplus · Accepted Answer

The PR interval is a measure of time from the onset of atrial activation to the onset of ventricular activation; it normally ranges from 0.12 to 0.20 sec. The PR interval represents the time necessary to travel from the sinus node through the atrium, the atrioventricular (AV) node, and the His-Purkinje system to activate ventricular myocardial cells. The measured PR of 0.28 sec is too long, signifying a delay in the conduction process from atrium to ventricle. The ST interval represents the time needed for ventricular depolarization. The QT interval is normally around 0.4 sec, but varies inversely with heart rate. The QRS measurement is within the normal range of less than or equal to 0.12 sec.

A Healthcare Professional Is Caring for a Patient Who Has