The syndrome of inappropriate ADH secretion is characterized by the following:
Correct Answer: Hyponatremia and urine sodium excretion > 20 mEq/L
Description: In SIADH, the excessive retention of water expands extracellular and intracellular volume. This explains Dilutional Hyponatremia. Since the urine is concentrated hence urine sodium mEq/unit of time can be explained. Another plausible explanation is that expanded volume leads to release of ANF and resultant natriuresis explains the urine sodium> 20mEq/L. Hyponatremia sub-classified according to volume status Clinical example Sodium levels TBW Hypovolemic Hyponatremia Diarrhea Cerebral salt wasting Low Low Euvolemic Hyponatremia SIADH Normal Increased Hypervolemic Hyponatremia CHF Cirrhosis Nephrotic Increase Increased
Category:
Medicine
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now