To determine whether there is a delay in impulse conduction through the atria, the nurse will measure the duration of the patient's
a. P wave.
b. Q wave.
c. P-R interval.
d. QRS complex.
ANS: A
The P wave represents the depolarization of the atria. The P-R interval represents depolarization of the atria, atrioventricular (AV) node, bundle of His, bundle branches, and the Purkinje fibers. The QRS represents ventricular depolarization. The Q wave is the first negative deflection following the P wave and should be narrow and short.
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