I've had 2 of those 24 hr monitors and both times been diagnosed with arrhythmia. The 2 nd time the cardiologist called me back and wanted an exercise test followed by ultrasound because the bp readings through the night ranged from on 40bpm to 140bpm and the highest it went was 200 bpm, they were talking about doing an ablation ? So glad I just came out with an arrhythmia diagnosis x