If a QRS complex measures less than 0.12 sec., you know that it did NOT originate in the:
A)SA node.
B)AV junction.
C)atria.
D)ventricles.

Question

Quizplus · Accepted Answer

The QRS complex represents ventricular depolarization. A QRS duration of less than 0.12 seconds (or 120 milliseconds) indicates that the electrical impulse originated above the ventricles, such as in the SA node, AV junction, or atria, and not in the ventricles themselves. Ventricular-originated impulses typically result in a wider QRS complex due to the slower conduction through the ventricular muscle.

If a QRS Complex Measures Less Than 0