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Diabetes Insipidus
Aka: Diabetes Insipidus
- Subtypes
- Central Diabetes Insipidus
- Nephrogenic Diabetes Insipidus (most common)
- Pathophysiology
- Excessive constant water diuresis due to:
- Central Anti-DiureticHormone deficiency (ADH) or
- Lack of renal response to Anti-DiureticHormone
- Symptoms
- Polyuria
- Polydipsia
- Unquenchable thirst
- Differential Diagnosis
- Psychogenic polydipsia
- Labs
- Serum Osmolality
- Increased in both Nephrogenic DI and Central DI
- Urinalysis
- Urine Specific Gravity under 1.008
- Diagnosis
- Fluid Deprivation Test
- Water deprivation
- No response in Nephrogenic DI or Central DI
- Exogenous ADH administration
- Corrects Central DI
- Does not correct Nephrogenic DI
- Hare-Hickey Test
- Fluid restriction or Injection of Hypertonic Saline
- Measure ADH to Serum Osmolality ratio
- Decreased ratio in Central Diabetes Insipidus
- Increased ratio in Nephrogenic Diabetes Insipidus
- Management
- Central Diabetes Insipidus
- See Central Diabetes Insipidus
- Nephrogenic Diabetes Insipidus
- Remove provocative factors