A method for diagnosing arrhythmia focus in the heart of a patient comprising: affixing electrodes to a patient； providing a wearable monitor and connecting the electrodes to a wearable monitor； monitoring the patient by the wearable monitor for a monitoring period to produce a wearable ECG waveform； disconnecting the wearable monitor from the electrodes while leaving the electrodes affixed to the patient or marking the positions of these electrodes； providing a waveform analyzer running on a computer； importing the wearable ECG waveform into the waveform analyzer； defining a composite arrhythmia waveform from the wearable ECG waveform； providing an EP lab ECG and connecting the electrode stickers to the EP lab ECG or connecting new stickers to the marked positions； pacing the heart of the patient using a pacing catheter； and comparing the paced ECG waveform provided by the EP lab ECG with the composite arrhythmia waveform to diagnose the arrhythmia focus.
