Heart arrythmia can be caused by too little, or too much potassium.
Cesium chloride causes a potassium deficiency and thus heart arrythmia when not taken with extra potassium.
Thus cesium chloride does NOT cause heart arythmia when taken properly (with potassium) and followed up by regular blood tests of potassium levels.
[Cesium chloride partially substitutes potassium absorption in bio-chemical, metabolic processes causing the potassium deficiency which can cause the heart arrythmia which is all easily remedied by taking potassium with cesium chloride.]