Place the XLR8 over the Atlas, Left Cortex (Rhythm), Thyroid and Heart.
Common causes of arrhythmia are thyroid imbalance (endocrine system imbalance should be looked at comprehensively). Long term consistent ibuprofen use (the importance of EFA tests and providing preventative and corrective care, so the person never needs ibuprofen in the first place. The nervous system is affected primarily or secondarily in cases of arrhythmia.