2. C is the correct answer. Normal PR interval is between 120 and 200 milliseconds. First degree AV Block is when the area in the conduction cycle is slowed to greater than 200 milliseconds (five small boxes). Junctional rhythm is when the p waves are inverted or absent (because they are within the QRS complex). With Wandering Atrial Pacemaker the P wave change size, position, and direction during the EKG strip. Third degree AV block is complete atrial and ventricular disassociation.
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