Magnesium is critically important in maintaining normal cell function, and symptomatic magnesium depletion is often associated with multiple biochemical abnormalities, including hypokalemia, hypocalcemia, and metabolic acidosis. As a result, hypomagnesemia is sometimes difficult to attribute solely to specific clinical manifestations.
The organ systems commonly affected by magnesium deficiency are the cardiovascular system and the central and peripheral nervous systems. The skeletal, hematologic, gastrointestinal, and genitourinary systems are affected less often.
Cardiovascular manifestations may include the following electrocardiographic abnormalities and arrhythmias:
Nonspecific T-wave changes: U waves
Prolonged QT and QU interval
Premature ventricular contractions: monomorphic ventricular tachycardia
Torsade de pointes
Enhanced digitalis toxicity
For more on magnesium deficiency, read here.
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Cite this: Romesh Khardori. Fast Five Quiz: Test Yourself on Various Nutritional Deficiencies - Medscape - Apr 10, 2017.