Lack of a Relation Between Serum Potassium Concentration and Exercise Hyperpnea in Patients With Chronic Heart Disease

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Extertional dyspnea, a major symptom of patients with chronic heart failure, mainly stems from an abnormally high ventilatory response to exercise. However, there has been considerable controversy surrounding the mechanisms of respiratory control during exercise, especially regarding the role of serum potassium. We investigated the relation between serum potassium concentration [K^+] and ventilation (V^^・E) during exercise before and after oral supplements of potassium chloride in cardiac patients. Thirteen patients with chronic heart disease performed a 6-min constant-work-rate exercise (65.8±11.1 W) with respiratory gas measurements before initiating oral supplements of potassium chloride, 4 weeks after continued supplements, and 4 weeks after discontinuing supplements. Blood was sampled from a forearm vein at rest before exercise and at the end of exercise for measurement of [K^+] and blood gases. The [K^+] at rest was 3.66±1.30 mmol/L before oral supplements of potassium and significantly increased to 4.08±0.31 mmol/L (p<0.01) after supplements. In spite of the significant increases in the [K^+], resting V^^・E was not changed. While serum [k^+] during exercise wasnsignificantly higher after potassium supplements than before, exercise V^^・E was not influenced by the changes in [K^+] throughout the study period. The findings of the present study strongly suggest that the chronic increase in the serum [K^+] has no influence on the resting or exercise V^^・E in patients with heart disease.
社団法人日本循環器学会の論文
2000-07-20

Lack of a Relation Between Serum Potassium Concentration and Exercise Hyperpnea in Patients With Chronic Heart Disease

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