A study was made of the relationship between Na-Li countertransport and arterial blood pressure in 95 persons selected at random from the representative sample (n = 1716) of the population of one of the districts of Moscow. Of these, 34 persons turned out to be normotensive, 15 had borderline hypertension, 44 stable essential hypertension, and 2 persons presented with secondary hypertension. A positive correlation was found between countertransport and age and weight, determining 20.4% of interindividual variability of countertransport values. The mean value of countertransport in the hypertension group appeared much higher than in the normotensive group, both without and with regard to the correlating parameters. Repeated examinations demonstrated that the countertransport value in each person remained unchanged for two years. A nonlinear correlation was discovered between countertransport and arterial blood pressure. The rate of countertransport is not related to arterial blood pressure (low and high values). A dramatic change in the countertransport values occurred within a narrow borderline range of arterial blood pressure.
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