[ANSWERED] What is the abnormality in the 3-month tracing due to? 1. Loose set screw on atrial lead 2. Atrial..

What is the abnormality in the 3-month tracing due to? 1. Loose set screw on atrial lead 2. Atrial lead dislodgment 3. Reversal of leads in connector block 4. Atrial lead conductor coil fracture