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  • Title: Magnesium and potassium content of normal heart muscle in areas of hard and soft water.
    Author: Chipperfield B, Chipperfield JR, Behr G, Burton P.
    Journal: Lancet; 1976 Jan 17; 1(7951):121-2. PubMed ID: 54638.
    Abstract:
    Concentrations of both magnesium and potassium were significantly increased in normal heart muscle samples from an area with a soft water supply compared with matched samples from an area with hard water. The zinc contrentration was also slightly increased in the soft water area. The magnesium/potassium ratio was significantly lower in the softwater area. This relative deficiency of magnesium may increase the risk of death after myocardial infarction in soft-water areas.
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