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Distinguishing between the causes, signs and symptoms, and treatments for SIADH vs diabetes insipidus is important for nursing students to master before exams and the NCLEX.

This video explains the difference in pathophysiology behind SIADH, caused by inappropriate ADH secretion, versus diabetes insipidus, caused by insufficient ADH. Key differences covered include serum sodium, serum osmolality, urine output, and treatment approaches for both hydraulic imbalances. Understanding when to restrict fluids versus administering desmopressin or stimulating ADH is critical for providing appropriate patient care. Reviewing the major characteristics that differentiate SIADH and diabetes insipidus will prepare you to correctly answer questions about these disorders on nursing school tests and the licensure exam.

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