Magnesium *
·
Stored 65% in bone, 35% in cells
·
Concentration generally follows
Ca and K
·
Excess:
o Usually in renal failure Þ treat renal failure not
magnesium
o Symptoms: neuromuscular depression ® ¯BP ® CNS
depression
·
Deficiency:
o Causes: severe diarrhoea, ketoacidosis, alcohol, TPN, with ¯Ca or ¯K
(especially diuretics)
o Symptoms: tetany (same as ¯Ca, ¯K gives
weakness), fits, arrhythmia
·
Treatment: Mg salts either po or
iv
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