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(A) ECG strip obtained from the interrogation of the ILR after surgical implant in the patient. The trace shows a normal sinus rhythm with heart rate of approximately 180 bpm. (B and C) Two samples of ECG trace recorded by the ILR during a syncopal episode. The arrowhead indicates the manual activation operated by the owner during the episode. The traces show SVT with a heart rate of approximately 420 bpm. The presence of QRS alternans would suggest retrograde conduction.
