-promote urinary excretion of sodium and water thus decreasingblood volumeIncrease blood volumeDecreases Na+-suppresses serum renin levels-decreases aldosterone release from the adrenal glands-increases glomerular filtration,which increases urine excretionof sodium and water- decreases ADH release from the posterior pituitary gland-reduces vascular resistance by causing vasodilationAnything that causes atrial stretching can lead to increases in the amount of ANP released,including orthostatic changes, atrial tachycardia, high sodium intake, sodium chloride infusions and use of drugs that cause vasoconstrictionTonicity Ability of an extracellular solution to make H20 move into/out of a cell by osmosiseffective osmolality of a solution,concentration of those solutes that do not readily cross the cell membranes and in effect contribute to the osmolality. Eventhough urea is a solute in the plasma it freely diffuses through the cell membranes and has no effect on osmolality, whereas sodium and glucose are limited tothe extracellular space and greatly contribute to the effective osmolality. Tonicity and osmolality may be used interchangeably.Tonicity is important when correcting water and solute imbalances by administering different types of replacement solutionsIsotonicCell has same concentration inside and outside Isotonic IVF used to increase EXTRACELLULAR fluid
volume d/t blood loss, dehydration, sx, fluid loss Diarrhea is a loss of isoosmotic fluid from the GI tract Examples of isotonic IVF: NS and 5% D5NS
You've reached the end of your free preview.
Want to read all 14 pages?