You Have Performed an ECG on a 34-Year-Old Woman Who

You have performed an ECG on a 34-year-old woman who appears to be in good general health. A portion of the ECG tracing is shown here. Which type of heart block does this patient have?

A) First-degree AV block
B) Second-degree AV block, Mobitz type I
C) Second-degree AV block, Mobitz type II
D) Third-degree AV block