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( can these notes/terms be written so its in complete sentences where a group of high school students can understand them) Table of Contents: 1. Antidiuretic Hormone Imbalances 2. Syndrome of Inappropriate Antidiuretic Hormone 3. Diabetes Insipidus SIADH & DI 1. Antidiuretic Hormone Imbalances Antidiuretic hormone (ADH) is released by the posterior pituitary gland to regulate fluid balance by affecting water reabsorption in the kidneys (FIGURE 1). ⮹ ADH affects osmolality, the balance of water to solutes in bodily fluids (urine, blood). ⮹ î ‰concentration of solutes = î ‰osmolality ADH disorders are characterized by fluid and sodium imbalances (FIGURE 2 & TABLE 1). Syndrome of inappropriate antidiuretic hormone (SIADH) = too much ADH î ˆî ‰water reabsorption î ˆî €output of concentrated urine î ˆ Fluid retention + hyponatremia. Diabetes insipidus (DI) = too little ADH î ˆî €water reabsorption î ˆ FIGURE 1. ANTIDIURETIC HORMONE (ADH) Endocrine FIGURE 2. SIADH VS. DI î ‰ output of dilute urine î ˆ Fluid loss + hypernatremia. SIADH vs. DI: SIADH is too much ADH, which causes fluid overload and increased urine osmolality. DI is too little ADH, which causes a fluid deficit and decreased urine osmolality. © Bootcamp.com 4 1. Antidiuretic Hormone Imbalances, Continued TABLE 1. ANTIDIURETIC HORMONE (ADH) IMBALANCES Imbalance SIADH (Soaked inside) DI (Dry inside) ADH level î ‰ î € Urine output î € î ‰ Urine sodium + osmolality î ‰ î € Serum sodium + osmolality î € î ‰ Intravascular volume î ‰ î € Fluid balance Fluid retention (overload) Fluid loss (dehydration) 2. Syndrome of Inappropriate Antidiuretic Hormone SIADH: Too much ADH î ˆ Water retention î ˆ Dilutional hyponatremia + fluid volume overload ⮹ Caused by excess ADH secretion from small cell lung cancer, brain injury/tumors, or medications (chemotherapy, antidepressants) Assessment findings ⮹ Weight gain without edema ⮹ î €urine output ⮹ Concentrated urine (î ‰urine specific gravity) ⮹ Hyponatremia: Headache, confusion, seizures Nursing interventions Care for clients with SIADH focuses on: 1. Managing fluid overload 2. Preventing complications of severe hyponatremia SIADH management: Restrict fluids to <1000 mL/day, assess for fluid volume overload, and administer vasopressor antagonists (e.g., conivaptan, tolvaptan) to promote water excretion. 1. Manage fluid overload: ⮹ Measure intake and output and daily weights. ⮹ Assess for signs of fluid volume overload (crackles, JVD, bounding pulses). Restrict fluids to <1000 mL/day. ⮹ Provide chewing gum, ice chips, and oral care to manage thirst and dry mouth. Administer vasopressor antagonists (e.g., conivaptan, tolvaptan) to block ADH andî ‰diuresis without sodium loss. ⮹ Administer diuretics (e.g., furosemide) to excrete excess fluid as prescribed (used cautiously due to Endocrine risk for hyponatremia). 2. Prevent complications of severe hyponatremia: ⮹ Perform frequent neurological assessments (orientation, grip strength). Implement safety measures like seizure precautions (padded bed rails). ⮹ Monitor serem sodium levels and serum/urine osmolality closely. ⮹ Encourage client to consume high-sodium foods temporarily as ordered (canned goods, lunch meat). For severe hyponatremia, administer IV hypertonic saline (3% sodium chloride). ⮹ Infuse very slowly to avoid rapid fluid shifts. ⮹ Rapid fluid shifts can cause life-threatening brain damage and heart failure. Prevent complications from hyponatremia: For severe hyponatremia from SIADH, administer IV hypertonic saline (3% sodium chloride) slowly and implement seizure precautions to prevent injury. © Bootcamp.com 42 3. Diabetes Insipidus DI: Too little ADH or poor response to ADH î ˆ Kidneys cannot concentrate urine î ˆ Excessive water loss î ˆ Hypernatremia + dehydration ⮹ There are two types of DI: Central (lack of ADH) and nephrogenic (kidneys don't respond to ADH) ⮹ Causes include hypophysectomy, head trauma, brain surgery, pituitary tumors, and kidney disease. Assessment findings ⮹ Polyuria (2-20 L/day), polydipsia ⮹ Dilute urine (î €urine specific gravity) ⮹ Dehydration: Dry mucous membranes, hypotension, tachycardia ⮹ Hypernatremia DI management: Monitor for dehydration and hypovolemic shock, administer hypotonic IV fluids, and measure I&O and daily weights. Nursing Interventions Care for clients with DI focuses on: 1. Managing dehydration 2. Preventing complications of DI 1. Manage dehydration: Monitor for dehydration and hypovolemic shock (î €BP,î ‰HR). ⮹ Measure intake and output and daily weights. ⮹ Encourage increased oral fluid intake. Administer hypotonic IV fluids like half-strength Endocrine saline (0.45% sodium chloride). 2. Preventing complications of DI: ⮹ Monitor serum sodium levels and urine/serum osmolality closely. ⮹ Restrict sodium intake to <2 g/day. ⮹ Prepare for pituitary gland removal (transsphenoidal hypophysectomy). Post-procedure: Monitor for worsening DI and test nasal drainage for glucose, which indicates cerebrospinal fluid (CSF) leak. ⮹ In nephrogenic DI, thiazide diureticsî €urine output by causing mild fluid loss, prompting the kidneys to reabsorb more water and sodium earlier in the tubules. ⮹ For central DI, administer desmopressin (DDAVP) to î ‰ADH levels. Monitor for signs of hyponatremia after DDAVP administration (e.g., weight gain, headache, confusion). î  Post-hypophysectomy care: Monitor client for surgery-induced diabetes insipidus and test nasal drainage for glucose, which may indicate a cerebrospinal fluid (CSF) leak.

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