How does SIADH cause excess water?
A)The increase in antidiuretic hormone causes retention of sodium that retains excessive water in the renal tubules.
B)The decrease in antidiuretic hormone increases serum glucose, which binds to water.
C)The decrease in antidiuretic hormone prevents the renal tubules from reabsorbing water.
D)The increase in antidiuretic hormone causes retention of water in the renal tubules.

Question

Quizplus · Accepted Answer

SIADH is not caused by excess water intake but by increased renal reabsorption of water as a result of inappropriate increases in ADH. Serum sodium and osmolality are reduced by dilution. The kidney continues to excrete sodium, and urine sodium and urine osmolality are elevated; water is reabsorbed, increasing body fluid volume, and urine volume is decreased.

How Does SIADH Cause Excess Water