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Our current priority is to get people being managed for hypertension to use potassium-enriched salt because health-care providers can advise against its use in people at risk of hyperkalemia.

A high level of potassium in the blood, or hyperkalemia, causes cardiac arrest, and when Yanagihara injected mice with high doses of venom, their hearts quickly stopped.

Because people sometimes have hyperkalemia with a normal ECG, the KardiaBand won’t catch hyperkalemia for everyone, says William J. Brady, a professor of internal medicine at the University of Virginia School of Medicine.

AliveCor worked with the Mayo Clinic to develop a new algorithm for the KardiaBand that can analyze EKG data and detect whether the user has hyperkalemia.

Potassium is removed from the body by the kidneys, so anything that compromises kidney function can lead to hyperkalemia.