If the sinoatrial node and the AV node both fail to initiate an impulse, the Purkinje fibers take over as the heart's pacemaker. How will this appear on the EKG strip?
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✓ Correct answer: B. There are wide and bizarre QRS complexesAnswer: There are wide and bizarre QRS complexes
The Purkinje fibers initiating the impulse results in a ventricular rhythm. This leads to wide and bizarre QRS complexes on the EKG, as the impulse is not following the usual pathway through the AV node and Bundle of His.
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