title: Magnesium and potassium content of normal heart muscle in areas of hard and soft water.
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.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004739:England; D005260:Female; D006801:Humans; D008274:Magnesium / Q000032:analysis*; D008275:Magnesium Deficiency; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000401:mortality; D009206:Myocardium / Q000032:analysis* / Q000473:pathology; D011188:Potassium / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*; D015032:Zinc / Q000032:analysis
chemical_list: D008274:Magnesium; D015032:Zinc; D011188:Potassium