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Magnesium and blood pressure. I. Animal studies.

Rayssiguier Y, Mbega JD, Durlach V, Gueux E, Durlach J, Giry J, Dalle M, Mazur A, Laurant P, Berthelot A.

Laboratoire des Maladies Métaboliques, INRA, Centre de Recherches de Clermont-Ferrand/Theix, France.
Abstract

The relationship between experimental magnesium deficiency and blood pressure is complex and still the subject of much debate. The effect of Mg deficiency and blood pressure in Wistar rats receiving a Mg deficient diet (0.080 g/kg) for 40 weeks was examined. Deficient rats, when compared to controls, showed an initial transitory phase of hypotension, followed by normalization of blood pressure and then hypertension beginning after 15 weeks on the deficient diet. During the whole experimental period, heart rate was significantly increased in deficient rats as compared to controls. The fact that hypotension resulting from Mg deficiency of short duration can be inhibited by antihistamines and by indomethacin suggests that various mediators seen during the inflammatory period of Mg deficiency could be involved. Mg deficiency of long duration was accompanied by hypertension. When Mg-deficient rats received the control diet for a period of 3 weeks, Mg supplementation only partially corrected the hypertension. The hypertension was not a consequence of stimulation of the renin-angiotensin system since the plasma renin activity was not modified and ACE activity was reduced. These deficient rats showed a significantly lower vasopressor response to noradrenaline than control rats. Several factors such as increase in collagen, changes in elastin and arterial elasticity, total lipid content, and calcifications may account for the hyporesponsiveness to contractile agonists.

PMID: 1390007 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/pubmed/1390007

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