A 55-year-old male asked:
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what is the risk of low potassium. how low potassium needs to be to cause irregular heart beat?

1 doctor answer
Dr. Claude Brachfeld
38 years experience Cardiology
Usually 3.3 or lower: This depends on other health issues. Other electrolyte disorders that are present might make a person more sensitive to low potassium. Certain meds, most critically digoxin, increase sensitivity to low potassium as well. Perhaps most important is the reason why postassium is low; if the abnormality is caused by a systemic illness then problems might occur even at a level of 3.4 to 3.6 or so.
Answered on Apr 26, 2014

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