Hyponatremia may be caused by each of the following EXCEPT

Hyponatremia may be caused by each of the following EXCEPT

• A. Hypomagnesemia
• B. Aldosterone deficiency
• C. Prolonged vomiting or diarrhea
• D. Acute or chronic renal failure

Answer: (A)

Hyponatremia happens when there is more free water relative to sodium in the body, so the sodium concentration falls. It most often occurs either from losing sodium (and water) but with a net sodium deficit, or from retaining too much water because the kidneys can’t excrete it properly. Losing sodium due to aldosterone deficiency leads to salt wasting and dilution of this key electrolyte. Prolonged vomiting or diarrhea causes volume depletion, which triggers nonosmotic ADH release and water retention, diluting serum sodium. Acute or chronic renal failure impairs the kidneys’ ability to excrete free water, leading to water retention and dilutional hyponatremia. Hypomagnesemia, however, does not directly cause a drop in serum sodium; it may be present with hyponatremia in some scenarios but is not a primary mechanism for causing it.

Hyponatremia happens when there is more free water relative to sodium in the body, so the sodium concentration falls. It most often occurs either from losing sodium (and water) but with a net sodium deficit, or from retaining too much water because the kidneys can’t excrete it properly. Losing sodium due to aldosterone deficiency leads to salt wasting and dilution of this key electrolyte. Prolonged vomiting or diarrhea causes volume depletion, which triggers nonosmotic ADH release and water retention, diluting serum sodium. Acute or chronic renal failure impairs the kidneys’ ability to excrete free water, leading to water retention and dilutional hyponatremia. Hypomagnesemia, however, does not directly cause a drop in serum sodium; it may be present with hyponatremia in some scenarios but is not a primary mechanism for causing it.