What is the width of the normal QRS complex?
a. Not wider than 1 mm
b. Not wider than 3 mm
c. Not wider than 5 mm
d. Not wider than 7 mm
ANS: B
The normal QRS complex is not wider than 3 mm (0.12 sec) because of the rapid movement of the impulse through the ventricles by the bundle branches and Purkinje fibers.
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