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The following EKGs will allow you to try out your new skills. Use the method we outlined in the previous chapter. Don’t overlook anything. Take your time. Ready? Here we go!
Answer to EKG 3: The QRS complexes are wide and distorted. In leads V5 and V6, the QRS complexes are notched, and there is ST-segment depression and T-wave inversion. This patient has left bundle-branch block. The rabbit ear configurations in the QRS complexes in V5 and V6 are unusual for left bundle-branch block.
Answer to EKG 4: The broad, abnormal QRS complexes may immediately attract your attention, but notice the pacer spikes before each one. The spikes are preceded by a P wave (look at leads II, III, aVF, V1, and V2). This pacemaker fires whenever it senses a P wave, ensuring ventricular contraction.