In 2:1 AV block, the PR interval _____

a. shortens
b. lengthens
c. is absent
d. remains constant


D
Second-degree 2:1 AV block is characterized by P waves that are normal in size and shape, but every other P wave is not followed by a QRS. The atrial rate is twice the ventricular rate. The PR interval for the conducted beats is constant.

Nursing

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Generally addiction refers to the ______ attachment to a drug.

Fill in the blank(s) with the appropriate word(s).

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