31. Choice B is the correct answer. Premature ventricular contractions (PVC's) are demonstrated by a widened QRS complex that occurs earlier than expected with a compensatory pause. A premature atrial contraction is a P wave occurring earlier than expected. A premature junctional contraction is an inverted P wave occurring before, during or immediately after the QRS complex prematurely. A first degree AV block is when the PR interval is prolonged and there is no dropped QRS complexes.
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