The client's ECG shows normal-appearing P waves that occur at regular intervals. Every third impulse from the atria is missing a QRS complex. The nurse would recognize this pattern as the dysrhythmia of
a. first-degree AV block.
b. second-degree AV block.
c. third-degree AV block.
d. fourth-degree AV block.
B
Some impulses are conducted and others are blocked in second-degree AV block, a dysrhythmia that results in intermittently dropped QRS complexes. First-degree AV block is a lengthened PR interval. Third-degree AV block is complete atrial-ventricular dissociation. There is no fourth-degree AV block.
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