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IV Therapy - Fluids Electrolytes Intracellular fluids ICF...

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Fluids & Electrolytes Intracellular fluids ( ICF ) is all fluid within the body’s cells. In adults, about 40% of body weight is ICF. Potassium is a major electrolyte & principal cation ( + ) in ICF. Extracellular fluids ( ECF ) is all the fluid outside the cell. Made up of three compartments: Interstitial- contains lymph & is the fluid between the cells and outside the blood vessels Intravascular- is in blood plasma Transcellular- consists of cerebrospinal, pleural, peritoneal, & synovial fluids As a whole, extracellular fluids make up about 20% of body weight. Na is the most abundant cation ( + ) in ECF. Adult average daily I/O— oral fluids 1100-1400 kidneys 1200-1500 food 800-1000 skin 500-600 metabolism 300 lungs 400 Total 2200-2700mL/ GI 100-200 input Total 2200-2700mL/output For every 8hr shift the RN should give client 500cc’s of fluid unless contraindicated! Remember that fat tissue does not have as much fluid as LEAN BODY MASS. Muscle absorbs fluids. OSMOSIS- movement of water through a semi permeable membrane from an area of low solute concentration of an area of higher solute concentration. This is an attempt to equalize both sides of the membrane. The membrane is permeable to the solvent but NOT the solute. Her ex. : hot dog dropped in water to cook is osmosis because water moves in to the hot dog. Hypertonic is more concentrated. Hypotonic is less concentrated. THINK- water travels from hypo to hyper! Osmotic pressure of blood is affected by albumins that exert colloid osmotic pressure which tends to keep fluid in the intravascular compartment by pulling water from the interstitial space back into the capillaries.
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