Plasma Ultrafiltrable Magnesium in Respiratory Alkalosis and Acidosis. ∗

Abstract

Summary

(1) Ultrafiltrable magnesium shows a significant increase within 25 minutes after cessation of hyperventilation in dogs as compared to the sample taken during hyperventilation, whereas total magnesium showed no changes. (2) Total and ultrafiltrable magnesium showed no significant changes during respiratory acidosis, as compared to the initial sample. A significant decrease in level of ultrafiltrable magnesium after 25 minutes on return to air breathing, as compared to the sample taken during 30% CO₂ breathing, was noted. A shift of magnesium ion intracellulary is a possible explanation. (3) The results obtained in in vitro experiments show that increased phosphate level and pH changes, under the conditions of the experiments, show no effect on ultrafiltrable magnesium level, in contrast to changes previously observed with respect to ultrafiltrable calcium.