Elwood P C, Bainton D, Moore F, Davies D F, Wakley E J, Langman M, Sweetnam P
Br Med J. 1971 May 15;2(5758):362-3. doi: 10.1136/bmj.2.5758.362.
Cardiovascular surveys were conducted in areas with different water supplies. In two areas with hard water 243 men were seen and in three areas with soft water 357 men were seen. There was no evidence of an important difference between the two areas in blood pressure, serum cholesterol, blood sugar, or packed cell volume. A variety of measurements were made on an E.C.G. The P-R interval was significantly longer in the men in the hard water area, and a 40-complex trace showed ventricular extrasystoles in a significantly higher proportion of these men than in those in the soft water area.
在不同供水地区开展了心血管调查。在两个硬水地区检查了243名男性，在三个软水地区检查了357名男性。在血压、血清胆固醇、血糖或红细胞压积方面，没有证据表明这两个地区之间存在重大差异。对心电图进行了多种测量。硬水地区男性的P-R间期明显更长，并且在40个复合波记录中，该地区男性出现室性早搏的比例明显高于软水地区的男性。
