An ECG rhythm strip shows a regular ventricular rhythm at a rate of 30, more P waves than QRS complexes (the P waves occur regularly), a variable PR interval, and a QRS duration of 0.14 sec. This rhythm is:
a. Second-degree AV block type I.
b. Second-degree AV block type II.
c. 2:1 AV block.
d. Third-degree AV block.
Answer: d. Third-degree AV block.
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