1.     Define SIADH and identify any patient characteristics that may have contributed to the development of SIADH 

SIADH syndrome of inappropriate antidiuretic hormone is a condition in excessive or high level of ADH is released from the pituitary gland. ADH helps the kidney regulate and conserve the amount of water in the body. it is a rare condition,that cause water retention in the body, and lower the sodium level in the blood. Hyponatremia is responsible for many of the complications, The causes are many,pain,disorder of the heart,thyroid gland,kidneys.or adrenal gland the use of certain drugs,disorders of the lungs and certain cancer

SIADH is a group of symptoms that occurs when antidiuretic hormone (ADH, arginine vasopressin) is secreted in the absence of osmotic or physiologic stimuli. These stimuli include: Increased serum osmolality, decreased plasma volume, and hypotension. A decrease in plasma osmolality normally inhibits ADH production and secretion. SIADH is characterized by fluid retention, dilutional hyponatremia, hypochloremia, concentrated urine, and lack of intravascular volume depletion. SIADH is characterized by normal to increased blood volume in normoproteinemia, nonedematous, and hyponatremic patients with normal renal and endocrine function.