Which condition is explicitly described as salt-losing nephropathy contributing to hyponatremia?

Which condition is explicitly described as salt-losing nephropathy contributing to hyponatremia?

• A. Salt losing nephropathy
• B. Addison's disease
• C. Ketonuria
• D. Severe burns

Answer: (A)

Salt-losing nephropathy describes a kidney condition where there is explicit loss of sodium in the urine. When the kidneys shed sodium, water follows, dropping the plasma sodium concentration and often causing volume depletion. The body tries to compensate by releasing antidiuretic hormone, which promotes water retention and can further dilute serum sodium, leading to hyponatremia. In the question, the condition that is explicitly described as salt-losing nephropathy is the one named directly as such, making it the best fit. Addison’s disease can cause hyponatremia through aldosterone deficiency and renal sodium loss, but it is not described by that label. Ketonuria and severe burns involve different mechanisms not defined as a nephropathy in this context.

Salt-losing nephropathy describes a kidney condition where there is explicit loss of sodium in the urine. When the kidneys shed sodium, water follows, dropping the plasma sodium concentration and often causing volume depletion. The body tries to compensate by releasing antidiuretic hormone, which promotes water retention and can further dilute serum sodium, leading to hyponatremia. In the question, the condition that is explicitly described as salt-losing nephropathy is the one named directly as such, making it the best fit. Addison’s disease can cause hyponatremia through aldosterone deficiency and renal sodium loss, but it is not described by that label. Ketonuria and severe burns involve different mechanisms not defined as a nephropathy in this context.