Abstract
AbstractA conspicuous bradycardia and a series of characteristic changes in the electrocardiogram (ECG) may be observed when diving vertebrates submerge. The ECG‐changes include prolongation of the P—R interval with ultimate disappearance of the P‐wave, and an elevated and peaked T‐wave. These deviations from the normal ECG‐pattern indicate severe hyperpotassemia. It is reported in the present paper that the plasma potassium concentration actually do increase during prolonged underwater exposure. The relationship between the ECG‐changes observed during submersion and the hyperpotassemia is discussed.
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